Sepsis and Severe Infections: A Primer for Nurses

Sepsis and Severe Infections: A Primer for Nurses

Published: December 19, 2022

Last Updated: December 28, 2022

William Kelly, MSN, FNP-C

Author | Nurse Practitioner

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Sepsis is a potentially life-threatening condition that occurs when the body has a systemic response to an infection. It is not caused by a specific type of bacteria but can be triggered by any type of infection, including bacterial, viral, or fungal. Most cases of sepsis in the hospital will be caused by severe bacterial infections. 

According to the CDC, sepsis is a leading cause of death in the United States. It is estimated that more than 1.7 million cases of sepsis occur each year, and kills about 270,000 people each year. The mortality rate for sepsis varies, but it can be as high as 50% in severe cases. This mortality rate is highest in patients who are over 75 and have multiple comorbidites.

It is important for nurses to be aware of the signs and symptoms of sepsis and to know how to recognize and manage it.

What is sepsis?

Sepsis is a common clinical syndrome that represents the body’s response to severe bacterial infection. Within the hospital, you will take care of patients with sepsis in any department, but especially in the ER and ICU.

Sepsis is a severe condition with a poor prognosis

Early sepsis– while not clearly defined – is the presence of infection and bacteremia (bacteria in the blood) – which can and likely will progress to sepsis without intervention. Recognizing and intervening early when the sepsis is still early can significantly improve patient outcomes. 

An enlarged prostate and urinary retention

The definition of sepsis changed in 2016

Sepsis is now is defined as life-threatening organ dysfunction in response to infection. Organ dysfunction, usually from hypoperfusion, can be evidenced by hypotension, altered mental status, tachypnea, or increased sofa score by 2 points. 

What is SIRS?

Sepsis used to be identified using SIRS criteriaSystemic Inflammatory Response syndrome. This is somewhat outdated and no longer used, but you still may often hear about this in your hospital. 

SIRS was a term that was used to describe the early stages of sepsis. It was defined as the presence of two or more of the following criteria:

  • Body temperature above 100.4°F or below 96.8°F
  • Heart rate above 90 beats per minute
  • Respiratory rate above 20 breaths per minute or PaCO2 below 32 mm Hg
  • White blood cell count above 12,000/mm3, below 4,000/mm3, or more than 10% immature neutrophils (bands)

The idea behind using the SIRS criteria to diagnose sepsis was that it could help identify patients who were at risk of developing sepsis and who may need early intervention. However, over time, it became clear that the SIRS criteria were not sensitive or specific enough to accurately diagnose sepsis. 

As a result, the SIRS criteria are no longer used to diagnose sepsis. Instead, the more recent Sepsis-3 criteria is recommended. 

SEPSIS-3 Criteria

The Sepsis-3 criteria is now used to help clinicians detect and diagnose sepsis, which includes the following 3 criteria:

  1. A suspected or confirmed infection
  2. An elevated lactic acid (>2 mmol/L)
  3. At least one of the following:
    • Hypotension requiring vasopressors to maintain a mean arterial pressure (MAP) of 65 mm Hg or higher
    • A serum lactate level greater than 2 mmol/L after adequate fluid resuscitation
    • An acute increase in the serum lactate level by at least 2 mmol/L within 24 hours

These criteria are designed to be more sensitive and specific than the SIRS criteria. It’s also more specific to identifying patients who are at high risk of dying from sepsis and are more likely to need aggressive intervention.

SEPSIS-3 CRITERIA

CriteriaDescription
1Suspected or confirmed infectionThe presence of a suspected or confirmed infection, such as pneumonia, urinary tract infection, or septicemia
2Serum lactate level above normalA serum lactate level above the upper limits of normal, indicating tissue hypoperfusion and cellular injury
3aHypotension requiring vasopressorsHypotension that requires the use of vasopressors to maintain a mean arterial pressure of 65 mm Hg or higher
3bSerum lactate level greater than 2A serum lactate level greater than 2 mmol/L after adequate fluid resuscitation
3cAcute increase in lactate levelAn acute increase in the serum lactate level by at least 2 mmol/L within 24 hours
Only need one of the last 3 items (3a, 3b, and/or 3c)

What is Septic Shock?

Septic shock is a type of distributive shock and occurs when the body is under severe distress and releases a lot of mediators and toxins which can cause vasodilation, decrease circulating blood volume, and tank the blood pressure. Septic shock is generally diagnosed when the patient has a MAP <65 mmHg and a lactic >2.0 mmol/L, often after their initial fluid bolus. These patients require vasopressors and should be monitored in the ICU.

Septic shock is a medical emergency and requires immediate treatment. If not treated promptly, it can lead to multiple organ failure and death.

Causes of Sepsis and Septic Shock

Sepsis can be caused by any infection that is left untreated or resistant to antibiotics that eventually causes systemic infection and reaction. While severe viral or fungal infections can cause sepsis, this is less common. Common bacterial infections that are more likely to cause sepsis include:

A bunch of E coli bacteria swimming around

Urinary Tract Infection (UTI)

Urinary Tract Infections (UTIs) are common causes of sepsis in elderly individuals. When a Cystitis (inflammation/infection of the bladder) can also travel up the ureters to the kidneys and cause pyelonephritis (infection of the kidney), which is more likely to cause sepsis as well. When a UTI becomes sepsis, this is called Urosepsis.

A bunch of E coli bacteria swimming around

Pneumonia

Pneumonia is a bacterial infection of the lungs. Left untreated, this commonly causes sepsis. In fact, severe sepsis can occur in almost half of patients admitted to the hospital with pneumonia.

Skin rashes - cellulitis

Cellulitis

Cellulitis is infection of the skin and surrounding tissue. Patient’s with severe cellulitis often have other risk factors, like obesity, diabetes, and other comorbid conditions which increase their liklihood of becomign septic.

Assessment of sepsis

Symptoms

Since sepsis isn’t only caused by one thing, the symptoms are going to depend on the underlying infection. However, there are some common symptoms that all sepsis usually share. These include:

A bunch of E coli bacteria swimming around

Fever & Chills

Fevers and chills are classic for infection. A true fever is greater than 100.4° F or 38° C. Sepsis often presents with even higher fevers of 102°, 103°, or 104° F

Chills are subjective, and many patients will report them (even for minor infections). However, patients with sepsis often have signifiacnt chills and tremors.

A bunch of E coli bacteria swimming around

Weakness & Fatigue

Whenever the body is fighting infection, it takes a toll on energy levels. With sepsis it also does this, but to an even larger degree as this is a systemic response.

graphic of a brain

Altered Mental Status

Altered Mental Status (AMS) commonly occurs with sepsis. This is due to decreased perfusion of the brain, as well as their body’s systemic reaction. Older and sicker patients are more likely to experience this. This is often exacerbated by dehydration. This can manifest as:

  • Drowsiness
  • Lethargy
  • Confusion

Other symptoms of sepsis will depend on the underlying cause of the infection. Some examples include:

  • Pneumonia: productive cough, shortness of breath
  • UTI: Dysuria, urinary frequency, pain (flank, back, or suprapubic region)
  • Cellulitis: Redness, swelling, and swelling of skin (often the legs)
  • Abdominal Abscess: Abdominal pain
  • Diverticulitis: Abdominal pain, diarrhea, bloody BMs

The patient should be asked about symptoms that may indiciate a cause for the infection.

Physical Exam

The physical exam is essential in patients with sepsis, as these patients are often very sick or on their way to becoming very sick. 

It is important to note that not all people with sepsis will have the same physical findings, and some may not have any physical findings at all. This is why it is important for healthcare providers to perform a thorough and complete assessment to identify any signs or symptoms of sepsis.

A bunch of E coli bacteria swimming around

Vital signs

  • Temp: A fever above100.4°F (38°C)
    • Could be hypothermic in severe sepsis
  • BP: Often low, hypotensive < 90/60 mmHg or MAP < 65 is worrisome
  • Pulse/HR: Tachycardic, may be between 90-140 bpm
  • Respirations: Normal but often somewhat increased (above 20 rpm)
  • Pulse Ox: May be normal or low, especially with respiratory infections
A bunch of E coli bacteria swimming around

Inspection

  • NEURO: Altered mental status (AMS)
  • HEENT: Dry mucous membranes
  • RESPIRATORY: Fast breathing, respiratory distress
  • SKIN:  pale or flushed, may have rashes, redness, or swelling
Skin rashes - cellulitis

Auscultation

  • Heart: Often rapid and regular
  • Lungs: May have crackles and/or Rhonchi if a respiratory infection is present
Skin rashes - cellulitis

Palpation

  • CARDIOVASCULAR: Peripheral pulses may be faint, cap refill often delayed, distal extremities may be warm
  • ABDOMEN: Usually non-tender;
  • BACK: Mid-line spinal tenderness with should prompt evaluation for spinal abscess

Nursing Interventions for Sepsis

When you suspect sepsis, there are multiple things you should do as the patient’s nurse. Timing is so important, and that’s why so many departments have quality metrics and procedures in place for septic patients to get things done quickly. The faster we act, the better the chances of the patient surviving. 

Bedside Monitor

Hook up the patient to the bedside monitor to monitor their vitals frequently, especially their heart rhythm and their blood pressure. Set the machine to check BP every 15 minutes. 

NOTIFY PROVIDER

Be sure to notify the provider ASAP, as these patients are very sick and need orders STAT.

Place the IV

Place at least two IVs, 18-20g, and draw blood. This is for fluid and medication administration such as antibiotics and maybe even vasopressors until a central line can be placed. 

Drawing blood

Once placing the IV, you can grab labs off of the IV site. You will want to grab a basic rainbow (Blue top, Mint or gold top, and a lavender top), as well as blood cultures and a lactic (if your facility protocol allows 1 blood culture from the IV site). 

Prime your Fluids

Prime fluids to be given once ordered – probably at least 2 liters. Septic patients need at least 30ml/kg bolus of isotonic fluids to improve their symptoms, stabilize their vitals, improve their lactic acidosis, and improve their survival rates!

An enlarged prostate and urinary retention

CHF or ESRD?

Should your patient with ESRD or CHF get the same amount of fluids? Keep reading below to find out!

Workup of sepsis

Since sepsis is a clinical syndrome, there’s not exactly a lab test that will definitely tell you whether the patient is in sepsis or not. However, there are common labs and imaging that may be ordered.

Blood Work

CBC

Usually have WBC counts above 12,000/mm3, although severe sepsis can also present with leukopenia of < 4,000/mm3. Bands over 10% are consistent with sepsis. 

An enlarged prostate and urinary retention

Bands & "Left Shift"

Bands are a type of immature white blood cells that when present in higher numbers indicate severe infection and sepsis. Bands are normally 0-5%, and bands >10% are worrisome. 

A “left-shift” is an ill-defined term that refers to an increased number of bands in the absolute neutrophil count.

CMP

A complete metabolic panel is drawn to see evidence of anything else going on, any possible source of infection, or of any organ damage that the sepsis may have already occurred. This will look at:

  • Kidney function (creatinine, BUN)
  • Liver function (AST/ALT, Alk Phos, Bili, etc)
  • Acid-base (Agap, CO2)
  • Glucose & Electrolytes
An enlarged prostate and urinary retention

CO2 = Bicarb

Look at the CO2 in the CMP. This is equivalent to the Bicarb in a venous blood gas sample. If it is < 18, they are likely acidotic, probably from lactic acidosis

A specific cup half filled with yellow urine

Coags

Coag studies (PT/INR, PTT) are ordered in septic patients to detect clotting abnormalities. Severe sepsis can activate the clotting cascade, cause organ dysfunction, and ultimately lead to DIC.

A specific cup half filled with yellow urine

blood cultures

Aerobic and anaerobic blood cultures should be obtained from two different sites. This will be used for a gram stain and will be cultured to see if any bacteria grows, as well as to perform sensitivity reports to various antibiotics.

A specific cup half filled with yellow urine

Procalcitonin

Procalcitonin is a non-specific inflammation marker (kind of like ESR and CRP). This isn’t always ordered for Sepsis, but it can help show clinical response to antibiotics, especially from bacterial respiratory infections. This can help guide the Provider to know when to switch to oral antibiotics or stop the antibiotics altogether.

A specific cup half filled with yellow urine

Lactic acid (lactate)

If the lactic acid, or lactate, is greater than 2 mmol/L, this indicates lactic acidosis. High lactate levels indicate decreased tissue perfusion of the organs, which is classic in Sepsis.

This will often be repeated every 4-6 hours until the level becomes normal.

Remember that Lactic acid is checked with a gray top (sometimes dark green), and should be transported ON ICE!

An enlarged prostate and urinary retention

Lactate from where?

Remember in cell biology learning about how cells make energy or ATP? They do this primarily with oxygen using the Krebs cycle. When oxygen isn’t as available, it switches to a backup method of creating energy called glycolysis, which a byproduct of that is lactic acid. 

Other Labs

A specific cup half filled with yellow urine

Urinalysis

Checking a urine sample is a MUST for anybody with sepsis, as urinary tract infections are a super common cause of sepsis. The presence of leukocyte esterase and WBCs, nitrites, and bacteria supports a UTI diagnosis. Check out the full article on how to interpret a UA!

A specific cup half filled with yellow urine

Other Collections

Other labs that might be ordered depending on the symptoms of the patient includes:

  • Anaerobic and Aerobic culture swabs of open wounds
  • Sputum culture if productive cough
  • Stool culture, ova/parasite, C-diff

Imaging

A specific cup half filled with yellow urine

A Chest X-ray

A CXR is always ordered in patients with sepsis to see if there is any pneumonia or to detect any other possible abnormalities. 

A specific cup half filled with yellow urine

CT abdomen/pelvis w/ Contrast

Sometimes an abdominal CT may be ordered if the patient has abdominal signs/symptoms, or significantly elevated liver enzymes. Contrast is preferred as this will better visualize any abscesses or fluid collections present, assuming their kidney function isn’t too bad. 

A specific cup half filled with yellow urine

CT thorax w/o contrast

A CT of the thorax without contrast is sometimes recommended but the radiologist after a chest x-ray is obtained. A chest-xray only has a sensitivity for pneumonia of about 43%.  aren’t perfect and could miss pneumonia or other findings that the CT will have much better sensitivity for picking up infection. 

An enlarged prostate and urinary retention

"PAN scan"

Sometimes a CT chest, abdomen, and pelvis is ordered when there is no known source for infection – this can be especially helpful when there is little history to go off of, and the patient is unable to express their symptoms. 

treatment of sepsis

Remember that sepsis is a systemic response to infection. Our first priority is to stabilize their vital signs and provide support. Our second priority is to give antibiotics to kill the bacteria. Because sepsis has such a high mortality rate, these should be done quickly!

Supportive Care

IV Fluids

All septic patients should get a bolus of crystalloid fluids (Normal saline or Lactated Ringers). It’s recommended that septic patients get 30ml/kg bolus – so a 70kg patient would get 2,100 mL of roughly 2 liters.

This should be run wide open, and if the patient is hypotensive, you should use pressure bags. 

This bolus should be finished infusing within the first 3 hours after the patient presents to the ER. 

antipyretics

Patients who are septic in the hospital often have fevers. Administering antipyretics can help reduce their fluid losses and improve their symptoms overall. Options include:

  • Tylenol 650mg every 4-6 hours (or 1000mg every 8 hours)
  • Ibuprofen 600-800mg every 4-6 hours (or other NSAIDs)
An enlarged prostate and urinary retention

What about CHF?

Even patients with CHF or renal failure need fluids during sepsis, although may require less. The nurse and Provider should continuously assess for signs of pulmonary edema, such as increased SOB, tachypnea, hypoxemia, and/or pulmonary crackles/rales. If this develops – stop the fluids, notify the provider, and expect to give diuretics and/or intubate the patient

Medical therapies

A vector graphic of a bed

antibiotics

Antibiotics are crucial in treating sepsis, as we need to fight the underlying bacteria that are trying to kill our patients. These should be given within the FIRST hour after the patient gets to the ER.

The choice of antibiotics should depend on multiple factors including the patient’s history, risk factors, as well as the suspected source of infection. In practice, you will commonly see an agent that covers MRSA (Vanco), plus a broad-spectrum antibiotic. Common regimens include:

  • Vancomycin + Zosyn
  • Vanco + Cefepime
  • Vanco + Imipenem
An enlarged prostate and urinary retention

What about Fungus?

Sometimes fungal infections can cause severe sepsis, and should be considered in some cases. If the patient is neutropenic or has risk factors for a severe fungal infection, the provider may order antifungal medications. This is likely best decided by Infectious Disease.

A vector graphic of a bed

Vasopressors

Vasopressors or “pressors” are medications that increase blood pressure through various means, usually by causing vasoconstriction of the blood vessels. This improves perfusion to important organs like the brain and the heart. However, these are also high-risk medications and only ordered when absolutely necessary.

In sepsis, the vasopressor of choice is often Norepinphephrine (also known as Levophed).

Vasopressors can usually be started peripherally in a pinch but eventually will require a central line to be placed. This is primarily because vasopressors can damage tissue if there is extravasation.

All vasopressors need to be closely titrated by a critical care nurse, and the goal is usually related to the MAP, not the systolic blood pressure.

An enlarged prostate and urinary retention

The MAP

The MAP stands for Mean Arterial Pressure. This is the average pressure in the arteries from one cardiac cycle (systolic + diastolic). This gives a better idea of the perfusion of the organs. To read more about this, check out here.

Norepinephrine (Levophed)

Vasopressor


Mechanism of Action

Stimulates Beta-1 and alpha-adrenergic receptors to increase the strength of contractions, the heart rate, and causes vasoconstriction – all of which increases systemic BP and coronary blood flow.

Sepsis DOSING

0.05 – 0.15 mcg/kg/min; titrate to MAP ≥ 65 mmHg.
* Always follow facility protocol and orders*

Max Dose

1 – 3.3 mcg/kg/min

SIDE EFFECTS

Hypertension, tachycardia, palpitations, headache,
nausea/vomiting, peripheral vasoconstriction

Glucocorticoids

In general, steroids like Solu-Medrol are not recommended during sepsis. However, it may sometimes be ordered by the critical care physician if the patient does not respond well to fluids and vasopressors. 

Monitoring & Complications of Sepsis

Lactic Acid

The lactic acid should be trended if it is elevated from the start. This is generally checked every 4-6 hours until it falls below 2 mmol/L

WBC & BAnds

WBCs should be trended as well, at least daily until resolution. This will usually immediately decrease with fluids and antibiotic administration.

A specific cup half filled with yellow urine

Urine output

A foley is often placed to track this closely, and it a strong indicator of kidney perfusion. The goal is often to have a urine output ≥0.5 mL/kg per hour.

Cardiac Monitor

Septic patients are usually tachycardic, and they are at increased risk for arrhythmias as well as myocardial infarctions. Close monitoring per department protocol is warranted.

Blood cultures & Sensitivities

Gram staining will be performed of the blood cultures usually within 24 hours, and cultures will grow bacteria if present in about 48-72 hours. This will depend on your hospital’s lab. The antibiotics may be changed depending on sensitivities. 

Hemodynamics

Blood pressure and MAP should be monitored for hypotension and improvement with interventions like fluids and vasopressors.  Goal is usually a MAP ≥65 mmHg

Assessment

The patient will need to be assessed per department protocol. You should be assessing for signs of worsening perfusion such as:

  • Pallor and sweating
  • Confusion
  • Worsening vital signs
A specific cup half filled with yellow urine

IV & extremities

Assess the IV sites and/or central line sites per protocol. Remember vasopressors can cause vasoconstriction of the extremities, so monitor for signs of decreased circulation such as:

  • Delayed capillary refill
  • Distal pallor or cyanosis
  • Necrosis of the fingertips

S/S of fluid overload

Patients who are septic are receiving plenty of fluids and are under a lot of stress overall. This can put a lot of strain on the heart, especially when the patient has a history of cardiac disease. Watch for s/s of fluid overload including:

  • Increased shortness of breath
  • Increased JVD
  • Respiratory Crackles/rales

If the patient is on vasopressors, make sure you are assessing their extremities pulses and capillary refill. Vasopressors can cause necrosis of the extremities like fingers or toes if they are clamping down too much.

Early recognition and treatment of sepsis are crucial for improving patient outcomes. The mortality rate for sepsis can be high, but quick action by nurses and doctors can make a significant difference in the patient’s outcome. It is important for nurses to be aware of the signs and symptoms of sepsis and to know how to recognize and manage it. By recognizing and treating sepsis early, nurses can help improve patient outcomes and save lives.

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Monkeypox: Everything Nurse’s need to know when Caring for Monkeypox patients

Monkeypox: Everything Nurse’s need to know when Caring for Monkeypox patients

Published: September 18, 2022

Last Updated: October 27, 2022

William Kelly, MSN, FNP-C

Author | Nurse Practitioner

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Unless you’ve buried your head under a rock, you probably have heard about the recent outbreak of Monkeypox.

Just like any infectious disease, nurses are on the front lines and we need to be educated about how to care for these patients, as well as how to minimize the risk of spread to our patients or families.

What is Monkeypox?

Monkeypox is a virus that is similar to smallpox because they are part of the same genus – the orthopoxvirus genus. It is a zoonotic disease, which means its natural hosts are animals – in this case primates and rodents. This virus causes a syndrome of fevers, body aches, malaise, and a pustular rash that is similar to smallpox, although less deadly and less contagious.

This is not a new virus, and normally tends to occur primarily in the tropical forests of West and central Africa. However, this does occasionally cause small outbreaks outside of these areas.

In 2003 there was a brief outbreak in the US, which included only 71 confirmed cases. Out of these, there was no spread to any healthcare staff or other patients within the hospital, and no associated deaths. 

Since May 2022, there is another outbreak in the US that is current and continues to spread, this time much more prevalent with over 21,000 cases confirmed in Septemeber, and over 50,000 cases globally.

Check out CDC for updated statistics.

Transmission of Monkeypox

There are multiple ways in which viruses can be transmitted to other people.

Monkeypox has a few different routes of transmission, some more common than others. These routes of transmission include:

Skin-to-skin contact

Skin-to-skin contact with an infected lesion is the most common route of transmission for monkeypox. This. ismost contagious when the lesions are present on the skin. This is why it is commonly transmitted via sex, even though it is not a sexually transmitted infection.

An enlarged prostate and urinary retention

Is Monkeypox an STI?

Despite what you may have heard on some news outlets, monkeypox is NOT a sexually transmitted infection and you cannot only get it through gay sex.

Most cases that are occurring are currently within the gay community of men who are having sex with men. This is sometimes how viruses work – they will spread in a certain community, and then make their way to other communities.

Respiratory Droplets

As with many viruses such as COVID, respiratory droplets can transmit infection. So if you cough sneeze or even speak, this can sometimes infect others depending on how close you are to them. Prolonged face-to-face contact may be required for this to occur with monkeypox.

Fomites

Fomite transmission is when the virus lives on a surface and another person picks up that object or touches that surface and then infects themselves. This can commonly be bed linens, clothing, or surfaces. This is different for every virus, and monkeypox has been known to be able to live on surfaces for up to 15 days!

An enlarged prostate and urinary retention

Not Contagious Anymore?

A person is considered infectious from the onset of clinical symptoms until all lesions have scabbed over and re-epithelization has occurred.

What to do if Exposed?

The CDC recommends that if a patient is exposed to monkeypox in the community, they should:

  • Monitor for symptoms for up to 21 days
  • If any symptoms develop, should isolate for at least 5 days to watch for the development of a rash
  • If the rash develops, isolate until evaluated by a healthcare professional (likely isolate until lesions resolve)

How dangerous is Monkeypox?

It’s difficult to predict how dangerous monkeypox is for those in the US, as most of our data comes from Africa. In Africa, they have less access to quality healthcare, and the predominant strain (called a “clade”) is more deadly there. 

From the data regarding Monkeypox in Africa, up to  3-6% of cases die.

So far. in the US, there have been one confirmed death from Monkeypox in LA. 

Remember that most of the current monkeypox infections are circulating among younger, generally healthy men.

We have not yet seen monkeypox in large amounts in older patients with significant comorbidities and immunocompromised patients, and they’re expected to have higher rates of complications and death.

Even if monkeypox does not cause death, it can last for weeks and lead to very painful and sometimes scarring lesions.

Prevention

Prevention is the most important aspect of infection control. If we can prevent spreading the virus, we can’t control the virus. This leads to better patient outcomes overall.

With monkeypox, there are ways to prevent the spread within and outside of the hospital. Monkeypox prevention includes:

Universal Precautions

Universal precaution should ALWAYS be used on all patients in every setting, and includes proper hand hygiene, and the use of clean gloves when dealing with or anticipating contact with a patient’s body fluids. This is one of the most important things we can do in healthcare to prevent the spread of infection.

Isolation Precautions

Patients who have suspected or confirmed monkeypox should be placed into isolation as per your facility protocol. As we discussed, monkeypox is spread primarily through physical contact as well as through respiratory droplets. This means that you should be using contact and droplet precautions, so typically that involves the use of a gown, gloves, N95 facemask, and protective eyewear.

N95 Mask

The CDC currently recommends N95 masks when entering a patient’s room with Monkeypox.

Vaccination

Smallpox, a similar but more contagious and deadly virus than monkeypox, was essentially eradicated in 1977 thanks to vaccinations. Because of this, routine vaccination was discontinued in 1980.

Because smallpox and monkeypox are so similars and comes from the same family of viruses, the smallpox vaccine is effective against monkeypox. However, it is in short supply and is being given to patients who meet high-risk criteria.

Currently, vaccination is recommended for patients who:

  • Have had close contact with Monkeypox for extended periods of time
  • A recent sex partner (the last 2 weeks) has been diagnosed with Monkeypox
  • A man or transgender/non-binary who has sex with men and in the last 2 weeks has:
    • Had multiple sex partners or group sex
    • Had sex at a commercial venue (bathhouse, sex club, etc)
    • Had sex in an area where monkeypox transmission is occurring

Assessment

Symptoms

Prodromal Symptoms

Patience with monkeypox will often present with a Prodromal period of symptoms, followed by the characteristic rash. During the prodrome, these symptoms will usually last up to 5 days and include:

Fever

A temperature above 100.4 F

graphic of a brain

Headache

Patients often complain of a severe headache

Back & Body Aches

Myalgias and pain are common with monkeypox, as with many other viruses

Fatigue

Patients are often very fatigued and tired

Lymphadenopathy

Patients often have swollen lymph nodes, which can be localized toa specific area, or generalized throughout their body

The Monkeypox Rash

The characteristic rash of monkeypox will typically develop 1-4 days after the prodromal symptoms start.

The Rash

Monkeypox will cause a characteristic vesicular/pustular rash that progresses through different stages (See more on the stages below). These lesions are often in the same stage as each other, but not always.

Other history

Recent Travel

Recent travel to an area where Monkeypox is Endmic, such as western Africa or the Congo Basin

Recent Exposures

Any recent contact with someone who may have had monkeypox

Sexual History

Any recent sexual contact or history that would place them at risk of getting monkeypox?

Physical Assessment

The physical inspection will primarily involve inspecting the skin for the monkeypox lesions, noting their quality, amount, number, and locations.

  • Generalized: May be febrile, sweaty, pale
  • HEENT: May have enlarged and tender anterior cervical lymph nodes, throat may be erythematous
  • Cardio: May have tachycardia, especially if fever present
  • Respiratory: may have increased respiratory rate, sometimes could have cough
  • Skin: Monkeypox lesions as described in detail below
  • Extremities: Lymphadenopathy may be present in axillae or groin

Vitals:

  • Temp: Often have fever >100.4
  • BP: Often normal
  • HR: May have mild tachycardia d/t fever, dehydration, etc
  • RR: May by mildly tachypneic
  • SPO2%: Often normal

THE RASH

The characteristic monkeypox rash begins approximately 1-4 days after the start off the other symptoms, although some people get the rash first. This begins as a macule, then slowly develops into vesicles, pustules, and then scabs over.

The rash will typically last 2-3 weeks. Patients are considered infectious until the scabs fall off and a new layer of skin forms.

1. Enanthem Stage

In some cases, lesions will first form in the mouth and/or on the tongue.

2. Macular Stage

Macular lesions will first appear, which are basically just rounded red spots that are flat. 

This stage lasts 1-2 days

3. Papular Stage

The macular lesions will then turn into papules, which are raised red bumps.

This stage also lasts 1-2 days

4. Vesicular Stage

The papular lesions will then turn into vesicles, which are raised bumps filled with clear fluid

This stage also lasts 1-2 days

5. Pustular Stage

The vesicular lesions will then turn into pustules, which are raised bumps that are filled with pus (suppurative fluid).

Initially, these are deep-seated, meaning firm and hard. Eventually, they develop an umbilication in the center.

This stage lasts 5-7 days

6. Scab Stage

Finally the pustules crust over and become scabs. These fall off after about 1 week.

This stage lasts 7-14 days

Nursing interventions

There are some nursing inventions that you can do right off the bat with these patients he suspected to have a monkeypox:

Isolate

Patients with suspected monkeypox or even chickenpox should be placed in contact and droplet precautions. The difference with chickenpox is that that tends to be airborne, whereas monkeypox is not, so a negative air pressure room is not required, although may be prudent just in case of chickenpox or other airborne viruses.

Follow proper isolation precautions to minimize the acquisition and spread of the virus. Always refer to your facility’s protocols.

Place the IV

Place at least one IV, preferably 20 gauge or larger, in order to infuse normal saline once it’s ordered. These patients are usually tachycardic and have fevers, and fluids will help rehydrate them, improve their vitals, and help them feel better overall.

Prime your Fluids

Prime at least 1 L of NSS spiked and ready to infuse. Verify a verbal or electronic order being administering (as always 😉).

Bedside Monitor

If these patients are significantly ill and tachycardic, it would be a good idea to hook them up to a cardiac monitor. While doing so, a full set of vitals should be taken if not done already in triage.

Administer Meds

Ask for and verify any medication that the patient may need, including antipyretics like Tylenol, an analgesic like morphine or Toradol, and/or an antiemetic like Zofran.

Diagnosis of Monkeypox

Diagnosis of monkeypox is largely clinical – so based on their history and the rash. However, it is recommended to confirm this in a lab due to the current outbreak.

There are a few ways monkeypox can be confirmed in the lab:

PCR Swab

A swab of the lesions can be obtained and sent to the lab, they should be obtained with a dry synthetic swab. For more information on how to collect the swab – see here.

2 swabs should be obtained from at least 2 different lesions. Vigorously swabbing back and forth is fine, and you do not need to “unroof” the lesions.

Antibody Testing

Some facilities can check for IgG and IgM antibodies to monkeypox. IgM is typically detected 5 days after onset of rash, and IgG is detected 8 days after onset of the rash.

Electron microscopy

Monkeypox can be identified under a microscope as well, where the pathologist visualizes brick-shaped poxvirus virions (indistinguishable from smallpox).

Other Lab abnormalities

There are other lab abnormalities that can present in patients with monkeypox, although these are NOT specific to monkeypox. these include:

  • Leukocytosis (increased WBC)
  • Transaminitis (Elevated liver enzymes)
  • Thrombocytopenia (Low platelets)
  • Hypoalbuminemia (low albumin levels)

Prognosis & Treatment

With the current US outbreak, patients who get Monkeypox generally have a good recovery, and most can fully recover at home without hospitalization. So far only one death has been specifically attributed to monkeypox in the US during this current outbreak.

However, patients can present with more severe symptoms and complications, which can lead to worse outcomes and even death. These patients are kept in the hospital and given more extensive treatment.

For most people who get Monkeypox, treatment is going to be symptomatic, just like with most viruses. Symptomatic or supportive care includes:

Supportive Care

Antipyretics

Antipyretics like Tylenol or Ibuprofen can be used to control fever and symptoms of pain.

Fluids

Encouraging oral hydration is important with any virus, and will help the body recover quicker, and prevent complications such as acute kidney injury. If the patient is admitted, these fluids can be given IV as well.

A vector graphic of a bed

Rest

Resting while the body recovers from infection is important for any virus, and will help the body heal as quickly as it can.

Antivirals

TPOXX

TPOXX is the abbreviation for Tecovirimat – an antiviral used for severe monkeypox infections. This is reserved for patients who are admitted to the hospital and have severe disease. Although we don’t have much data in humans, this antiviral has been shown to decrease mortality rates in animals with monkeypox when started early in the course of the illness.

  • Rx: 600mg IV or PO Q12h x 14 days (depending on weight).
  • Side Effects: include headaches, nausea, and abdominal pain.

Tecovirimat

Antiviral


Mechanism of Action

Potently inhibits the orthopoxvirus protein required for the formation of virus particles

DOSING

600mg IV/PO Q12H x 14days (for 40-120kg)

SIDE EFFECTS

Headache, Nausea, abdominal pain

Cidofovir/brincidofovir

Cidofovir has been shown to be effective in killing monkeypox in animal studies. Brincidofovir is a prodrug of cidofovir and was also approved for the treatment of monkeypox, however, did show some elevated liver enzymes in animal studies.

Complications & Monitoring

As discussed, most patients recover well at home, but there are certain complications and monitoring that you should watch for.

Patients at increased risk of developing more severe complications include:

  • Immunocompromised: People with HIV/AIDS, leukemia, chronic steroid use or other immunosuppressants
  • Age < 8
  • Pregnant or breastfeeding women
  • People with active skin diseases like severe eczema, impetigo, burns, etc

Secondary bacterial infections can occur with viral infections, and this is no different than with monkeypox. Bacteria like to strike while the immune system is busy fighting the virus. This can lead to infections like pneumonia or sepsis.

Common secondary infections include:

sepsis

Bacterial infections in any location can cause sepsis. This often happens from UTIs, lung infections, or skin infections.

Bronchopneumonia

Pneumonia should be suspected with productive cough, shortness of breath, adventitious breath sounds, and respiratory distress. This is evaluated with a CXR.

graphic of a brain

Encephalitis

Encephalitis can occur with various infections and cause confusion, migraines, seizures, and overall altered mental status. This may be diagnosed by brain imaging (CT or MRI), EEG, and a lumbar puncture.

How to care for DKA: An Expert Nurse’s Guide to Diabetic Ketoacidosis

How to Care for DKA

An expert nurse’s guide to Diabetic ketoacidosis

William Kelly, MSN, FNP-C

Author | Nurse Practitioner

What is Diabetic Ketoacidosis (DKA)?

Diabetic Ketoacidosis, or just DKA for short, is a severe complication of diabetes. This occurs when there are high sugars combined with a severe lack of insulin, causing the body to suddenly break down fat stores for energy to use ketone bodies as fuel. This leads to severe acidosis, which can cause the patient to be very sick

Patients with DKA are usually admitted to the ICU. 

What causes dka?

In order to understand DKA, we need to have a decent understanding of acid/base balance. 

The pH will determine how acidic something is. This scale goes from 0 being the most acidic, to 14 being the most basic (or alkalotic). A pH of 7 is considered completely neutral. 

The human body’s normal pH is almost completely in the middle, but slightly basic. 

The normal pH of the blood is 7.35 – 7.45, with 7.40 being the sweet spot.

There are two main organ systems that work together to maintain pH balance. These systems are your respiratory system and your renal system, referred to as your “metabolic system” when talking about acidity.

The number of hydrogen ions present in the blood will determine how acidic it is. The more hydrogen ions = the more acidic. The kidneys system will release buffers to lower the pH if it is too high, as well as excrete more hydrogen ions into the urine to decrease the acidity.

At the same time, the respiratory system may increase or decrease the respiratory rate to alter the pH. Breathing out more carbon dioxide out will decrease the overall pH. 

Oxygen (O2) to carbon Dioxide (CO2)

Oxygen is breathed into the lungs, transported by the red blood cells, and then delivered to the cells of the body. The cells use the oxygen o create energy through a process called the “Krebs cycle”. A byproduct of this energy creation is carbon dioxide (CO2), which is then breathed out during exhalation.

Whenever the cause of the acidity decreases serum bicarb levels, this is called metabolic acidosis. Whenever the root cause of acidity causes a buildup of carbon dioxide, this is called respiratory acidosis. Metabolic alkalosis and respiratory alkalosis work the same, but with high bicarb and low carbon dioxide, respectively. 

(You probably should just check out my ABG article for more info!)

DKA is one of the most common types of metabolic acidosis. This is multifactorial in nature but is characterized by a rapid increase in circulating ketone bodies, which are acidic. 

Because there is a complete or severe lack of insulin, glucose is unable to get into the cells to provide energy – since the cells use insulin to help transport glucose across the cell membrane. When this happens, the body starts to freak out. This causes a massive body response by breaking down fat cells to use ketone bodies.

Ketone bodies can passively cross the cell membrane without insulin, so they can provide much-needed energy to cells that are literally starving. The ketone bodies that are created are acetoacetic acid, Beta-hydroxybutyrate, and acetone. 

Acetone

Acetone is actually neutral – it is not acidic. However, its presence likely means there is a presence of other ketone bodies, which ARE acidic. Not every lab will be able to check for beta-hydroxybutyrate.

What is the “Anion Gap”?

You will often hear talk about the Anion gap when it comes to DKA and acidosis in general, but what exactly is the Anion Gap?

The anion gap (AGAP or AG), measures the difference between negatively charged and positively charged electrolytes in the blood. Positively charged particles are called cations, and negatively charged particles are called anions

So essentially, this is the positive electrolyte (Sodium) minus the negative electrolytes (Chloride PLUS Bicarbonate). 

What about Potassium?

Potassium is a cation, but levels are low in comparison to sodium, chloride, and bicarb because most of its content is stored intracellularly, so this doesn’t really impact the anion gap by much. Most calculations now exclude it.

DKA vs Hyperglycemic Hyperosmolar State (HHS)

Many type 2 diabetics that have uncontrolled sugars that do not often have DKA. This is probably because they still produce some insulin from their pancreas.

Hyperglycemic Hyperosmolar State (HSS) is another complication that can occur due to high blood sugars, which is more common in older patients with uncontrolled sugars. 

Whenever blood glucose is high in the blood, patients can quickly become dehydrated. This is due to a process called osmotic diuresis.

Essentially, the sugar pulls a lot of water with it into the urine which is excreted by the kidneys. This dehydration causes what’s called hyperosmolality of the blood. Basically, the blood and extracellular fluid is super concentrated with sodium, so this pulls water out of cells, leading to cellular dehydration. 

Because these patients usually have some level of insulin sensitivity and the presence of insulin, the massive shift of fat breakdown and ketone formation doesn’t occur on the same scale, which means severe acidosis doesn’t occur. 

HHS is usually managed with IV fluids and subcutaneous insulin, but sometimes an IV drip is still used.

Nursing Assessment

Patients who are in DKA are often obviously sick.

They often are vomiting, may have abdominal pain, and appear dehydrated and weak. In severe cases, they can also have some altered mental status, especially if they haven’t been able to drink fluids.

70-90% of cases of DKA occur in Type 1 diabetics and are usually due to an underlying cause. These causes include:

New Onset Type 1 DM

Patients who don’t know they are a type 1 diabetic yet

Noncompliance with insulin therapy

Patients who don’t take insulin as prescribed

Infection

If there is an infection, most commonly Pneumonia or UTI

Medications

Steroids, high-dose thiazide diuretics, dobutamine, terbutaline, second-generation atypical antipsychotics, or SGLT2 inhibitors

Drugs

Cocaine use has been associated with recurrent DKA

Symptoms

Symptoms of DKA evolves rapidly over a 24-hour period, whereas HHS is more of a slow worsening of symptoms. Symptoms of DKA include:

Nausea or vomiting

May be from delayed gastric emptying and ileus (where a section of the intestinal wall does not perform peristalsis as normal)

Abdominal Pain

Common in DKA, but almost never happens with HHS

Polyuria & Polydipsia

Increased urinating is due to the osmotic diuresis described above, and the increased thirst is due to the hyperosmolality of the blood

Weight Loss

This is due to water losses, as well as fat losses from the massive lipolysis that occurs

Altered Mental Status

Lethargy, confusion, and/or obtundation can occur. Focal signs are possible as well. AMS tends to be worse in HHS because these patients often have a higher degree of hyperosmolarity.

The Physical Exam

Inspection

Increased respiratory rate

This is termed Kussmaul respirations. This is the body trying to breathe off extra CO2 to compensate for the increased acidity caused by the DKA

Dry Mucous Membranes

Looking in their mouth and at their tongue is a great indicator of hydration status. These patients will be dry as a bone.

Your Other Senses?

You may notice a fruity odor coming from the patient’s mouth. This is the acetone that they are breathing out. Years ago, Nurse’s used to taste a patient’s urine as well to check for a sweet glucose taste, but that has fallen out of favor… although i’m not sure why…

Vital Signs

Temp: Often normal, but may high if infection

HR: Often tachycardic due to dehydration +/- infection

BP: May be low with severe hypovolemia

SPO2: Usually normal

Respiratory Rate: often >20 rpm (Kussmaul respirations)

Auscultation

Heart: Fast and regular

Lungs: usually clear but frequent and deep

Palpation

Pulse: Peripheral pulses may feel weak and thready

Abdomen: May have some tenderness but shouldn’t have rebound or guarding

Nursing intervention

Cardiac Monitoring

Patients in DKA are prone to severe electrolyte abnormalities such as hypokalemia, which can cause deadly cardiac arrhythmias to occur

Blood Glucose

Glucose monitors will often read “HI” if above 600 g/dL. However, even “euglycemic” DKA has occurred with near-normal glucose levels.

Place IV

Any sick patient that may require ICU should have at least 2 IVs placed, preferably at least 20g. These patients will need a large volume of fluid replacement as well as will likely require an insulin drip and IV potassium.

Draw Labs

Be sure to draw a gold top for the chemistries, and a lavender top for CBC. If a VBG is ordered, also draw a green top and place it on ice.

Hang Fluids

These patients are often visibly dehydrated and tachycardic. Hang 1-2L of NS open to gravity (and of course obtain an order to verify). 

Medications

Ask for and administer medications such as Zofran or pain meds if the patient is nauseous or in severe pain

DKA WOrkup & Diagnosis

DKA is diagnosed based on lab work alone. The presence of a high anion gap PLUS a high sugar usually means DKA.

Blood Glucose

This is the level drawn either with a capillary glucose monitor or within the CMP of the labs. Patients in DKA often have blood sugars between 350-550 mg/dL

Anion Gap

A high anion gap acidosis is the hallmark of DKA. The AGAP is usually >20 in DKA. This is usually due to the markedly reduced serum bicarb levels, as well as the accumulation of ketone bodies.

Plasma osmolality

This is always elevated in HHS, but not always elevated in DKA. >295 mOsm/kg is considered hyperosmolar, and in HHS often levels exceed 320. Effective serum osmolality can also be calculated here

CO2

Serum CO2 in the CMP is equivalent to Bicarb in an ABG.

If the CO2 aka Bicarb is lower than 18, this generally indicates metabolic acidosis.

Sodium

Most patients with DKA are mildly hyponatremic (low sodium), but their levels will often appear even lower. This is because the high blood sugar pulls water out of cells and dilutes the sodium.

For an accurate sodium level, you should add 2 mEq/L for each 100mg increase in glucose above 100 mg/dL. You can also use this calculator.

Potassium

Most patients with DKA and HHS have a total body deficit of 300-600 mEq of potassium.

This is because a lot of the potassium is urinated out along with water and ketones.

Lab levels usually appear normal and sometimes even elevated – but don’t be fooled!

Due to hyperosmolality and insulin deficiency, intracellular potassium moves out of cells and into the extracellular fluid.

Once insulin is administered, the potassium will be transported back into the cells, and the patient can be left with severely low potassium which can cause arrhythmias and even death.

BUN/Creatinine

Kidney function may be elevated from prerenal acute kidney injury from dehydration and hypovolemia. The patient may also have some diabetic nephropathy.

Leukocytosis

Most patients with DKA will have mild leukocytosis, and this is usually proportional to how many ketones are in the blood. It may also be related to cortisol and stress hormones as well.

A WBC > 25 or bands >10% should raise suspicion of infection.

ABG

ABGs are rarely needed in DKA. Remember DKA is metabolic acidosis, and there often is respiratory compensation.

If drawn, this means the pH will be acidic (< 7.35), the HCO3 will be low (<18), and the CO2 will also be low (<35) to compensate.

VBG

A VBG is often ordered instead of a full ABG in patients with suspected DKA. We are mainly evaluating the patient’s pH and bicarb levels, which are essentially equivalent to their ABG counterparts.

Serum Ketones

Serum ketones can be drawn to directly detect ketones within the blood. These do not need to be drawn if the patient has a AGAP acidosis with hyperglycemia, but will depend on the facility and ordering Provider.

Serum acetone or beta-hydroxybutyrate can both be ordered, and different hospitals will have different options.

Urinalysis

A urinalysis will often show a decreased specific gravity from the osmotic diuresis. Additionally, it will often show large glucose and often ketones.

Starvation Ketosis

Starvation ketosis can occur in diabetics and non-diabetics when they aren’t eating, often accompanied by vomiting. This can lead to ketones in the urine and the blood, but there is no acidosis. This is not treated as DKA and is best treated with IV fluids with dextrose and antiemetics.

Other Labs

Amylase and lipase may be ordered if pancreatitis is suspected, and lipids may also be ordered (but usually with morning labs).

DKA Treatment

Treatment of DKA aims at reversing the acidosis as well as lower the glucose.

Each hospital and Provider may have their own protocols, but treatment generally involves these two steps:

IV Isotonic fluids

The first step in treating DKA is to replace IV fluids, usually with Normal Saline, which helps stabilize vital signs, replace fluid losses, increase insulin responsiveness, and reduce stress hormone levels.

Remember that severely high blood sugar causes severe dehydration, so these patients usually need a lot of fluid. 

This is usually with 2-4L NS for the first 3-4 hours, infused at 1L per hour. 

If the patient has a history of CHF or advanced renal failure, this should be infused slower with careful monitoring for fluid overload.

IV Insulin Drip

As long as potassium >3.3, Insulin can be started.

Each hospital will have their own insulin drip protocol. Often a bolus is given first of 10 units (0.1u/kg body weight). Then the infusion is started at 0.1u/kg/hr. 

Regular and rapid-acting insulins are equally effective at treating DKA and HHS.

Once the serum glucose reaches between 200-300, dextrose is usually added to the IV fluid until the acidosis resolves.

IV Potassium

If >5.3 mEq/L: IV Potassium is held off until levels drop below 5.3. These are checked hourly.

If 3.3 – 5.3 mEq/L: IV potassium is started as long as the patient is making >50ml/hr of urine, indicating appropriate renal function. 20-30mEq is usually added to each liter of IV fluid.

The goal is to maintain the potassium between 4 – 5 mEq/L.

If <3.3 mEq/L: The patient requires 20-40mEq/hr until the potassium is above 3.3. This is often added to NSS or ½ NS.

Insulin therapy should not be started until this level is above 3.3!

IV Potassium Rate

Potassium is very irritating to the veins and can lead to pain and phlebitis. Also, rapid infusion of potassium can result in severe hyperkalemia (Rule #1 of nursing: NEVER push IV potassium!).

Potassium shouldn’t exceed 10mEq/hour in a peripheral line, or 20mEq/hour in severe cases.

In a central line, potassium can be infused as fast as 20-40mEq/hr in severe cases.

More IV Fluids

After the first few hours, IV fluids should be continued at a slower rate. This will be selected by correcting the sodium level for hyperglycemia.

If the sodium level is still low, Normal saline is usually continued.

If the corrected sodium is normal, hypotonic saline is started (i.e. 1/2 NS).

These are usually continued at a rate between 250-300ml/hr.

IV FLUID TONICITY

Potassium is as osmotically active as sodium, so adding potassium to your saline will increase the fluid’s tonicity. To make a relatively “isotonic” solution, 40-60mEq of Potassium is often added to 1/2 NS.

Dextrose is also osmotically active, but the dextrose will be metabolized quickly, ultimately having less of an effect on the tonicity.

IV DEXTROSE

While it may seem counterintuitive, IV dextrose is added to the IV fluids once the blood sugar reaches somewhere between 200-300 mg/dL.

This is because insulin is still needed to “close the gap” and reverse the acidosis, but the glucose can still drop too much. If the blood glucose drops below 200-300mg/dL can increase the chance of cerebral edema!

In HHS, its best not to let the glucose drop below 250-300 mg/dL, and in DKA no less than 200 mg/dL.

An example of a fluid would be D5 1/2 NS (likely with potassium added as well).

Check out my article on IV FLUIDS!

Patient Monitoring

Patients with DKA are at high risk for complications, so they should be monitored closely, especially while in the ICU. 

Blood Glucose

Each hospital should have a facility protocol when it comes to insulin drips.

Usually, this requires blood glucose checks every hour.

Once the glucose drops below 250 mg/dL, fluid with dextrose is usually started until the AGAP normalizes, otherwise the patient will become hypoglycemic.

Lowering the glucose too much in these patients can lead to cerebral edema.

Serum Potassium

As discussed above, this should be monitored frequently.

A BMP is usually checked every 2-4 hours while on an insulin drip.

Cardiac Monitor / EKG

Monitor for tachycardia, ectopy, or any arrhythmias.

Severe hypokalemia and acidosis can lead to fatal arrhythmias like VFIB, Asystole, and PEA.

Blood Pressure

Significant acidosis and hypovolemia can cause hypotension.

When the body is acidotic, medications like vasopressors don’t work as well as they should.

Anion Gap

Once the AGAP returns to normal, the gap is considered ‘closed” and the patient does not require an IV insulin drip anymore.

They are usually transitioned to subcutaneous insulin at this time.

Hopefully this left you with a good idea of what DKA is, how we recognize it, how we treat it, and what monitoring parameters you need to watch out for as a nurse! 

What would you like to learn next? Let me know if the comments below!

REFERENCES

Hirsch, I. B., & Emmett, M. (2022). Diabetic ketoacidosis and hyperosmolar hyperglycemic state in adults: Treatment. In T. W. Post (Ed.), Uptodate. https://www.uptodate.com/contents/diabetic-ketoacidosis-and-hyperosmolar-hyperglycemic-state-in-adults-treatment

Hirsch, I. B., & Emmett, M. (2022). Diabetic ketoacidosis and hyperosmolar hyperglycemic state in adults: Clinical features, evaluation, and diagnosis. In T. W. Post (Ed.), Uptodate. https://www.uptodate.com/contents/diabetic-ketoacidosis-and-hyperosmolar-hyperglycemic-state-in-adults-clinical-features-evaluation-and-diagnosis

Hirsch, I. B., & Emmett, M. (2022). Diabetic ketoacidosis and hyperosmolar hyperglycemic state in adults: Epidemiology and pathogenesis. In T. W. Post (Ed.), Uptodate. https://www.uptodate.com/contents/diabetic-ketoacidosis-and-hyperosmolar-hyperglycemic-state-in-adults-epidemiology-and-pathogenesis

Melmed, S., Koenig, R., Rosen, C., Auchus, R., & Goldfine, A. (2019). Type 1 Diabetes Mellitus. In Williams textbook of endocrinology (12th ed., pp. 1453 – 1457). Elsevier.

The Ultimate ABGs Blood Gas Guide you Need to Calm Your Nerves

The Ultimate ABGs Blood Gas Guide you Need to Calm Your Nerves

Published: June 14, 2022

Last Updated: December 24, 2022

William Kelly, MSN, FNP-C

Author | Nurse Practitioner

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This ultimate ABGs Blood gas guide is exactly what you’ve been looking for to understand Arterial Blood Gases! ABGs are used frequently in the ER and ICU settings, and many critical patients will need their blood gases monitored frequently.

Featured Image for ABGs blood gas interpretation guide for nurses

What Are ABGs or a Blood Gas?

ABGs, or an Arterial Blood Gas, is a blood sample that is taken from an artery in the wrist. This is different than normal blood work, which is taken from the veins of the arms. The arterial blood sample is obtained by a respiratory therapist or a critical care nurse.

Arterial samples provide better indicators of oxygen and carbon dioxide levels, but ABGs also look at acidity and bicarbonate levels within the blood.

A blood gas is used to look at acid-base disturbances and/or to evaluate the adequacy of oxygenation/ventilation. When an ABG blood gas is ordered, 4 contents of the arterial blood are tested:

  • Oxygen Levels: This measures PaO2 as well as SaO2
  • Carbon Dioxide levels: PaCO2 levels
  • pH: the acidity of the blood
  • Bicarbonate: The amount of bicarb, which is a buffer

Oxygen (O2) and carbon dioxide (CO2) are the main gases within the blood, and these are measured in blood gas. However, ABGs also provide levels of blood pH and Bicarb.

Of all of the measurements, the most important levels to look at are the CO2, the Bicarb, and the pH in determining acid-base balance.

When are ABGs ordered?

ABGs are very useful in evaluating acid-base disturbances, as well as ventilation/oxygenation disturbances. The patients who are ordered ABGs are often sick – usually ICU bound. The most common patients who might have a blood draw include:

Things to keep in Mind with ABGs

There are some important factors to keep in mind when thinking about ABGs and interpreting them.

Things Aren't Always Simple

Patients can have mixed acid-base disturbances, which can make it confusing. That’s why the interpretation is ultimately best left up to the critical care physicians and other Providers within their care.

Compensation

Remember the body is always trying to maintain homeostasis. The respiratory system will attempt to compensate for the metabolic system and vice versa.

Underlying Cause

Always focus on treating the underlying cause.

THE ABGs: Blood Gas Measurements

Okay, so lets dive a little deeper into what each measurement is on the ABG results, and what their levels mean.

The pH

pH is the “potential of Hydrogen”, which measures how acidic a solution is. The more hydrogen ions present in a solution, the more acidic it is. 

  • Normal pH of blood: 7.35-7.45
  • Low pH (<7.35): Indicates acidosis, and is termed acidemia
  • High pH (>7.45): Indicates alkalosis (metabolic or respiratory), and is termed alkalemia

pH may be normal or near-normal in chronic acid-base disturbances from compensation, or the patient can have multiple different acid-base disturbances going on at once.

The PaCO2

The PaCO2 is the partial pressure of Carbon Dioxide within the arterial blood. Essentially this is just a measure of the amount of carbon dioxide gas within the blood.

Remember that the lungs breathe in oxygen, deliver the oxygen to the cells, and the cells use that oxygen to create energy. To create energy (ATP), the cells utilize the Kreb’s Cycle, and a byproduct of that cycle is carbon dioxide. That CO2 is then breathed out when you exhale.

CO2 isn’t acidic by itself, but in the blood forms something called carbonic acid, which is acidic. Breathing out less CO2 will cause acidosis, and breathing out too much CO2 can cause alkalosis.

IF THE PaCO2 AND the pH are both high, think RESPIRATORY ACIDOSIS.

  • Normal: 35-45 mmHg
  • Elevated: >45 mmHg, termed hypercapnia
  • Decreased: <35 mmHg, termed hypocapnia

My Blood is BOILING

When you hold your breath, eventually you need to breathe again because it feels like your blood is boiling. This always helped me remember that when you aren’t breathing enough, the CO2 makes it boil – aka acidosis!

The HCO3 (Bicarb)

HCO3 on an ABG blood gas is the serum bicarb levels within the arterial blood. Bicarb acts as a buffer to make acidity less acidic. Think of it as the opposite of hydrogen ions. The less bicarb there is, the more acidic the blood is. To get technical, Bicarb reacts with H+ to form carbonic acid, which the body breaks down into CO2 and water – which it breaths out.

  • Normal: Between 22-26 mEq/L
  • Elevated: >26 mEq/L, associated with metabolic alkalosis
  • Decreased: <22 mEq/L (associated with metabolic acidosis)

The PaO2

PaO2 is the partial pressure of oxygen within arterial blood. This basically measures the actual oxygen blood gas content.

  • Normal: > 80 mmHg
  • Elevated: > 100 mmHg, usually due to over-oxygenation
  • Decreased: <80 mmHg, associated with respiratory failure, although could be from severe anemia as well

Oxygen Toxicity

Don’t forget that too much oxygen can be bad too. Oxygen toxicity can produce reactive oxygen species and cause cellular injury, inflammation, and cell death. It can also worsen hypercapnia like in patients with COPD.

The SaO2

The SaO2 is the peripheral oxygenation, which is equivalent to the Pulse Ox reading.

  • Normal: Above 94-96%
  • Decreased: <90-92%

ACID-BASE DISTURBANCES

When interpreting ABGs and blood gases, there are 4 general categories we use:

  • Respiratory Acidosis
  • Respiratory Alkalosis
  • Metabolic Acidosis
  • Metabolic Alkalosis

Using these categories, we can better understand what the possible underlying cause of the acid-base disturbance is!

Don’t forget someone can have multiple acid-base disturbances going on at one time, and this makes clinical interpretation difficult – everything is not black and white in medicine, but this should give you a pretty good idea of what may be causing your patient’s acid-base disturbance.

RESPIRATORY ACIDOSIS

Respiratory acidosis is due to alveolar hypoventilation. The lungs are NOT able to remove enough carbon dioxide quickly enough, so CO2 and Hydrogen build up in the blood.

High CO2 tends to occur late in the lung disease or when respiratory muscles are fatigued – this is usually seen in severe respiratory failure. The acidosis can be acute or chronic.

This classically can happen to patients with COPD because they are less responsive to hypoxia and hypocapnia. There is also increased dead-space ventilation and decreased diaphragmatic function due to fatigue and hyperinflation.

Acute Respiratory Acidosis

Acute respiratory acidosis could be from multiple different reasons including:

  • Respiratory Failure & Airway Obstruction: Severe asthma, COPD, CHF
  • CNS disease: Stroke, Traumatic brain injury
  • Drug-induced: Opioid or benzodiazepine overdose
  • Neuromuscular Disease: Myasthenia Gravis, ALS, Guillan Barre

Chronic Respiratory Acidosis

Chronic respiratory acidosis may occur when the PaCO2 is elevated, but the pH remains normal or near-normal because the body adjusts (metabolic compensation). Causes of chronic respiratory acidosis include: be Obesity-Hypoventilation syndrome (Pickwickian syndrome), ALS, interstitial fibrosis, and thoracic skeletal deformities.

  • COPD with Chronic CO2 retention
  • Obesity-hypoventilation Syndrome: Also called Pickwickian syndrome
  • Others: ALS, Interstitial fibrosis, thoracic skeletal deformities

COPD & Oxygen

When your patient with COPD is on a lot of oxygen, there is always a risk of hypoventilation and CO2 retention. This is the classic patient you should be thinking about with respiratory acidosis.

The treatment for respiratory acidosis is treating the underlying cause (i.e. giving Narcan to someone who overdosed on opioids), but more often than not the treatment is BIPAP or Intubation.

RESPIRATORY ALKALOSIS

This acid-base disturbance is due to alveolar hyperventilation. The lungs remove too much carbon dioxide too quickly, so hypocapnia (low PaCO2) and alkalosis occur.

It is commonly found in those who are critically ill, but can be found in various other conditions such as:

Ventilated Patients

The settings on the ventilator could be incorrect, and the patient may have a rate that is too fast

Hyperventilation

Patients experiencing panic attacks, severe anxiety, or psychosis can experience respiratory alkalosis. However, the patient’s with panic attacks almost never have ABGs ordered (it’s unnecessary)

Early-Intermediate Lung Disease

Pneumonia, pneumothorax, pulmonary embolism, asthma, bronchitis. This is more the increased respiratory rate compensating for the disease, but eventually, these issues can cause respiratory acidosis instead

Numbness & Tingling with Hyperventilation

Acute low CO2 levels lead to potassium and phosphorus shifting into the cells and cause calcium to increase its binding to albumin. This can cause temporary symptoms such as numbness/tingling in extremities that many patients may experience with acute panic attacks!

The treatment for respiratory alkalosis is treating the underlying cause, such as adjusting ventilator settings, administering anxiolytics, etc. 

Metabolic Acidosis

A bicarb level <22 mEq/L in addition to a pH <7.35 is metabolic acidosis. This acid-base disturbance is due to increased plasma acidity. Metabolic Acidosis is further broken down into whether or not the Anion Gap is normal or elevated.

Severe HCO3 levels <12 are almost always caused by some degree of metabolic acidosis, instead of just compensation for respiratory alkalosis.

Normal Gap Metabolic Acidosis

This type of metabolic acidosis usually has high chloride. This is when Bicarbonate is lost within the GI tract or kidneys (is peed or pooped out). This can be caused by:

Diarrhea

Diarrhea can cause loss of Bicarb within the stool but tends to save chloride, which does not increase the anion gap.

Chronic Renal Failure

Typically when GFR is between 20-50ml/min

Renal Tubular Acidosis

In RTA, the kidneys do not remove acid from the blood like they should

Large-Volume Fluid Replacement

Replacing large volumes of Normal Saline can cause a modest metabolic acidosis that is termed dilutional acidosis. This can worsen kidney injury. Using Lactated Ringers is a possible benefit to this, as the lactate is used as a buffer.

Elevated Gap Metabolic Acidosis

The anion gap is the difference between the positive ions in the blood (sodium), and the negative ions in the blood (chloride, bicarb, lactic acid, ketones, etc). Common causes of elevated gap metabolic acidosis include:

    Diabetic Ketoacidosis

    DKA causes a massive increase of ketone bodies which are acidic, in addition to severe dehydration

    Lactic Acidosis

    Lactic acidosis, especially in setting of sepsis, can cause metabolic acidosis

    Acute Kidney Injury

    Injury to the kidneys can cause a decreased ability to excrete hydrogen ions as well as the ability to increase bicarb levels to help buffer the acidosis

    Ingestion of certain Poisons

    Certain substances are toxic and can cause metabolic acidosis including alcohols, salicylates, cyanide, and carbon monoxide

    The treatment of metabolic acidosis is to correct the underlying issue causing the acidosis in the first place. Bicarb drips can be used in severe cases of acidosis (pH < 7.1 or 7.2).  

    METABOLIC ALKALOSIS

    This acid-base disturbance is caused by increased serum bicarb and decreased acidity. Bicarb levels >35 mEq/L are almost always caused by some degree of metabolic alkalosis as opposed to just compensation.

    For metabolic alkalosis, the acidity or hydrogen ions (H+) are usually lost in some manner, either through the GI tract or the kidneys:

    Excessive Vomiting

    Gastric secretion has a high content of hydrogen ions, so excessive vomiting can reduce overall acidity within the body

    NG Tube

    Over time, NG tubes remove a lot of gastric fluid, similar to excessive vomiting, this can cause a decrease in hydrogen ions

    Alkalotic overdose

    Rare, but if you consume massive amounts of milk products or antacids this can cause metabolic alkalosis

    Renal Losses

    The use of certain diuretics or mineralocorticoid excess, and some other rare disorders can cause the kidneys to pee out too many hydrogen ions.

    STEPS TO INTERPRET ABGs

    It always helps to have a systematic approach when interpreting ABGs, as blood gasses can be somewhat confusing if you miss a step!

    Determine the pH

    First, see whether or not the patient is acidic (pH <7.35), or alkalotic (pH >7.45). This will tell you if there is an acute acid-base disturbance going on.

    PCO2 + HCO3 Abnormalities

    See which levels are abnormal. Are they leaning acidic or alkalotic?  

    Correlate with pH

    See which one (CO2 or HCO3) correlates with pH. For example, if the pH is 7.2 (acidic), which abnormality is also leaning towards acidity? If CO2 was 56 and HCO3 was 30, the CO2 correlates with the pH because both are acidic.

    Determine Compensation

    Now check the level that doesn’t correlate with the pH. Is this also abnormal but in the opposite direction? If so this is termed compensation. If the pH is abnormal, it is only partial compensation. 

    Check the Anion Gap

    This step is optional and done if there is metabolic acidosis. This will help give you a better idea of which type of acidosis it is. If it is high, think of kidney failure, sepsis, or DKA. If it is low, think severe diarrhea. 

    Hopefully, this gave a good idea of how to interpret ABGs, as well as the treatment involved with abnormal results.

    REFERENCES

    Emmett, M., & Szerlip, H. (2022). Approach to the adult with metabolic acidosis. In T. W. Post (Ed.), Uptodate. https://www.uptodate.com/contents/approach-to-the-adult-with-metabolic-acidosis

    Emmett, M., & Szerlip, H. (2022). Causes of metabolic alkalosis. In T. W. Post (Ed.), Uptodate. https://www.uptodate.com/contents/causes-of-metabolic-alkalosis

    Hopkins, E., Sanvictores, T., & Sharma, S. (2020, September 14). Physiology, Acid Base Balance. National Library of Medicine. https://www.ncbi.nlm.nih.gov/books/NBK507807/

    Sood, P., Paul, G., & Puri, S. (2010). Interpretation of arterial blood gas. Indian J Crit Care Med, 14(2), 57-64. https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2936733/

    Theodore, A. C. (2022). Arterial blood gases. In Uptodate. https://www.uptodate.com/contents/arterial-blood-gases

    AFIB RVR on EKG: Management of Atrial Fibrillation

    AFIB RVR ON ECG

    Management of Atrial fibrillation

    William Kelly, MSN, FNP-C

    Author | Nurse Practitioner

    Atrial Fibrillation (AFIB) and AFIB RVR are common conditions that you’ll see as a nurse within both inpatient and outpatient settings. These patients are often asymptomatic, but may have severe symptoms and even be unstable, especially with AFIB RVR.

    Recognizing AFIB on the monitor/EKG and knowing how to treat it is important as the nurse, as you’ll be on the front line with these patients!

    AFIB RVR Atrial Fibrillation Featured Image-min

    What is Atrial Fibrillation (AFIB)?

    Atrial Fibrillation (AF or AFIB) is an “irregularly irregular” arrhythmia that usually occurs in a structurally diseased heart.

    AFIB occurs when too many atrial impulses are usually coming from the pulmonary veins, causing rapid fibrillation or “quivering” of both the left and right atria.

    Remember, the heart has four chambers: left and right atria on the top and left and right ventricle on the bottom. With AFIB, the top chambers are in a constant state of fibrillation.

    During a normal heartbeat, the atria first contract, pushing blood into the ventricles, and the ventricles then pump the blood to the rest of the body. In AFIB, the atria lose this “atrial kick,” leading to ineffective atrial filling and decreased cardiac output, especially at rapid rates.

    Cardiac Conduction Review

    It is helpful to remember how the cardiac conductions system works to understand what is going on with AFIB.

    Remember, the heart has specific electrical conduction tissue, which creates and moves the electrical signal throughout the heart to produce an organized rhythm. This organization lets the heart fill and pump effectively.

    Cardiac Conduction System: AFIB RVRThe heart’s pacemaker is the sinus node located in the right atrium. This region of cells creates the “normal” impulse and sends it throughout the atria and then through the AV node. This AV node normally slows the conduction to allow for ventricular filling. The PR interval on the EKG denotes this slowing of the conduction.

    Once traveling through the AV node, the impulse goes through the Bundle of His. It splits down the left and right bundle branches towards each ventricle, then through the Purkinje fibers and eventually the ventricles, causing a heartbeat.

    In AFIB, rapid-firing comes from the atria, usually where the pulmonary veins meet the left atria. This leads to the quivering of both atria and ineffective atrial filling and atrial kick.

    While the AV node does slow down conduction, it can only do so much on its own. With such rapid firing from the atria, many of these impulses want to make it down to the ventricles and cause heartbeats.

    As you can imagine, this can lead to very fast heart rates – what we call AFIB RVR or rapid ventricular response.

    What is AFIB RVR?

    AFIB RVR (Rapid Ventricular Response) occurs due to the frequent electrical impulses from the atria.

    The AV node is only able to slow the frequent electrical impulses down so much, so many of the impulses are conducted through to the ventricles, leading to a rapid ventricular response or a fast heart rate >100bpm and often much faster.

    Patients with these fast rates are often symptomatic and may become hypotensive. These patients will usually require IV medications to slow down their rate, and possibly even electrical cardioversion (more on that later!).

    What causes AFIB?

    AFIB usually occurs in predisposed hearts and is often set off by reversible triggers.

    Chronic diseases which predispose the heart to AFIB include:

    Atrial Enlargement

    Anything causing atrial enlargement such as CHF, Cardiomyopathy, COPD, OSA, obesity

    Valvular Heart Disease

    Rheumatic Fever, aortic stenosis, valve repelacements, etc

    Ischemic Heart Disease

    Coronary artery disease, past or current myocardial infarctions (heart attacks!)

    Usually, some reversible trigger throws the patient into AFIB. These reversible triggers include:

    Surgical Procedures

    CABG or heart transplants, usually within the first 2 weeks postop

    Pulmonary Emblolisms

    PEs can cause right atrial heart strain and Increased pulmonary vascular resistance

    Alcohol

    Alcoholics and binge-drinking can cause Holiday Heart syndrome, which can occur in 60% of binge drinkers

    Drugs

    Cocaine and amphetamines can increase sympathetic tone and leave the heart predisposed to arrhythmias such as AFIB

    Hyperthyroidism

    Hyperthyroidism (low TSH) can cause increased sympathetic tone and lead to arrhythmias

    Hypomagnesemia

    Low magnesium levels can lead to AFIB, generally levels < 1.5 (check this).

    Medications

    Certain medications can trigger AFIB including Theophylline and adenosine.

    Caffeine

    Although caffeine is often thought of as contributory to ectopy and AFIB, there is no direct evidence it does trigger AF. However, it is something to consider.

    Nursing Assessment of AFIB RVR

    Symptoms of AFIB

    Up to 44% of patients with Afib are asymptomatic. Patients with faster rates are more likely to develop symptoms, and those with CHF are more likely to experience hemodynamic instability and severe symptoms (aka low BP and possible code situation).

    Some symptoms of AFIB can include:

    Fatigue

    Most common complaint

    Dypnea

    Shortness of breath

    Diaphoresis

    Sweating

    Dizziness

    Dizziness or lightheadedness

    Palpitations

    Fluttering or skipping in their chest, or possibly just feeling their heart pounding

    Chest Pain

    Chest pressure, pain, or discomfort

    Syncope

    Loss of consciousness

    The Physical Exam

    Inspection

    • Pallor or flushed
    • Diaphoresis
      • May appear tachypneic

      Vital Signs

      • BP: May be low at fast rates and with poor cardiac output
      • Pulse/HR: Often >100 (RVR)
      • Respirations: Normal or increased
      • SPO2: Usually normal

      Auscultation

      • Lungs
        • Usually Normal
        • May have crackles if CHF
      • Heart
        • Rapid and irregular rate

      Identifying AFIB RVR on the ECG

      Atrial fibrillation (AFIB RVR)

      AFIB will NOT have visible P waves. Instead, there will be a fibrillatory baseline. There is no depolarization wave throughout the atria, but rather rapid twitching and many “small” depolarizations, firing at rates 350-600 times per minute.

      The QRS complex should be narrow unless an underlying intraventricular conduction delay is present, such as a bundle branch block.

      The T waves may be difficult to decipher between the F-wave baseline completely. T wave abnormalities are common, including T wave flattening.

      AFIB is irregularly irregular. This means that the R-R interval is continuously changing, and there is no pattern.

      AFIB can be at any rate, but faster than 100 is considered AFIB RVR. Without medications to slow it down, rates are usually between 90-170 bpm.

      AFIB: Atrial Fibrillation Notes

      Initial Nursing Interventions

      STAT EKG

      Any patient with cardiac symptoms should get an EKG.

      Patients with new AFIB should have a 12-lead EKG to confirm the diagnosis.

      If the patient is at significant fast rates, keep them hooked up to grab another one once the rate improves or the patient converts.

      Cardiac Monitoring

      Patients with any cardiac symptoms should be placed on the cardiac monitor.

      Those patients with a history of AFIB with normal rates does not necessarily need a cardiac monitor.

      Oxygen Support

      If the patient is significantly hypoxic or tachypneic, apply 2-4 L/min NC to maintain SPO2 >90%.

      IV Access

      Start two peripheral IVs at least 22g, but preferably one at least 20g. If they are in AFIB RVR, they will likely need an IV Cardizem drip and IV heparin in separate lines.

      If there is a concern for pulmonary embolism or embolic stroke, make sure to place an 18-20g in the AC.

      While drawing blood, make sure to draw a blue top as PT/INR, PTT, and a D-dimer may be ordered.

      Unstable Tachyarrhythmia

      Remember that any unstable tachyarrhythmia should follow ACLS guidelines. This means the patient may need electrically cardioverted. If they are unstable (Low BP, impending arrest), then place the defibrillation pads on the patient and hook them up to the defibrillator.

      Workup for AFIB RVR

      The workup will depend if the patient is in new-onset AF or already has chronic AF and if they are in RVR or not.

      Patients with a known history of AFIB who have controlled rates don’t need any specific testing. They are usually on chronic medications to control their heart rates and anticoagulants to prevent blood clots.

      Patients with new AFIB or AFIB RVR require more extensive testing, and the workup may depend on their symptoms.

      General workup for new AFIB includes:

      12-lead ECG

      AFIB can be diagnosed with this, as well as to look for any other abnormalities such as a STEMI

      Basic Labs

      CBC, CMP, and magnesium will often be checked

      Additional Labs

      Coag studies such as PT/INR and PTT, BNP if s/s of heart failure, digoxin level if patient is taking, and a D-dimer may be ordered as well

      CXR

      If they have any cardiac or pulmonary complaints this should be obtained

      CTA

      If there is suspicion of a PE. It May also detect atrial thrombi but is not very sensitive

      CT head

      If any altered mental status or stroke-like s/s

      Complications of AFIB

      So why do we even care about AFIB? Well, there can be disastrous consequences if we do not treat it appropriately.

      Unstable Symptoms

      Patients with AFIB have an inadequate atrial filling of blood, as well a loss of the atrial kick which pushes blood from the atria to the ventricles. This decreases cardiac output. When the ventricles have a rapid response, these insufficiencies worsen and can lead to hemodynamic compromise – hypotension, hypoxemia, and eventually cardiac arrest.

      Worsened CHF

      Patients with Left ventricular dysfunction (aka CHF with a low EF) already have a weak heart. This drop in cardiac output will be more significant, often leading to severe symptoms and an unstable patient!

      Blood Clots

      With the atria quivering – stasis of blood occurs. Remember, stasis of blood is one of the 3 factors that can lead to blood clots (Virchow’s triad). This increases the likelihood of thrombus formation.

      A thrombus in the right atria can embolize to the lungs and cause a pulmonary embolism, and a left atrial thrombus can embolize to the brain and cause an embolic stroke.

      Both of these are very serious conditions which can lead to disability and death, so prevention of this complication is important.

      Treatment of AFIB RVR

      Treatment of AFIB differs and depends on the patient’s symptoms and quality of life. This will involve at least one, but possibly all three of the following:

      • Rate control: Control the heart rate with AFIB (preventing RVR)
      • Rhythm Control: Convert and maintain the patient in a normal sinus rhythm
      • Anticoagulation: Giving blood thinners to prevent blood clot formation within the atria

      Which the Provider team and Cardiology will ultimately choose treatment options. We’ll dive a little deeper into each of these treatment options.

      Rate Control

      Rate-control is achieved via medications to slow down the ventricular response to the AFIB. Common medications include Metoprolol, Diltiazem, Digoxin, Esmolol, Amiodarone, and even magnesium sulfate.

      For AFIB RVR, we often give the following medications to control the rate:

      IV Diltiazem

      Also called Cardizem, this is more commonly given for AFIB RVR. The dose is 0.25mg/kg bolus, which is usually around 20mg. This should be pushed over 2 minutes. A repeat bolus of 0.35mg/kg can be given in 15 minutes if rate control is insufficient, and then a patient should be started on a titratable Cardizem drip.

      IV Metoprolol

      Also called Lopressor, this is especially helpful if the patient is on a Beta-blocker at home and maybe has missed some doses. The dose is 2.5-5mg IV q5m x 3. Administer the IV push over 2 minutes, and monitor rhythm and blood pressure closely. Use with caution with asthma/COPD exacerbations.

      Low BP & RVR

      One thing to point out is that those patients with significant left ventricular heart failure and AF RVR may paradoxically improve their blood pressure with rate control, so it still may be wise to administer a low dose of metoprolol or cardizem in these select patients if borderline hypotension is present. Always verify with the Physician/APP.

      Rhythm Control

      Rhythm-control is achieved via medications or electrical cardioversion. If the patient is unstable, they will be electrically cardioverted. Otherwise, the cardiologist may choose to start the patient on an antiarrhythmic such as amiodarone, Flecainide, multaq, etc.

      Many elderly patients who do not have significant symptoms will not undergo rhythm control. This is ultimately up to the cardiologist.

      Chemical Cardioversion

      IV amiodarone can be used, or the cardiologist may choose to start an oral antiarrhythmic such as Amiodarone, Sotalol, Dofetilide, etc

      Electrical Cardioversion

      Unstable patients should undergo synchronized cardioversion with the defibrillator

      Radiofrequency Ablation

      Patients with frequent symptoms (often younger patients) may undergo an ablation to burn off the area of the heart that is triggering AFIB

      Anticoagulation

      Anticoagulation is almost always used in patients with AFIB, unless there is acute bleeding or a significant risk of bleeding.

      Anticoagulation is used to prevent thrombus formation which can cause PEs and Strokes as explained above. Within the hospital, anticoagulation will include either:

      Heparin Drip

      The Provider will order a titratable heparin drip per facility protocol. This usually will have an initial bolus ordered as well. The patient’s PTT will occasionally be checked and the drip will be adjusted accordingly. Heparin drips offer quickly-reversible anticoagulation in case the patient starts bleeding.

      SubQ Lovenox

      SubQ lovenox at a dose of 1mg/kg BID can be given alternatively.

      Before being discharged, the patient is then transitioned onto an oral anticoagulant such as coumadin, Eliquis, Xarelto, Pradaxa, or ASA/Plavix.

      Coumadin

      Coumadin is much less commonly prescribed than it used to be because it requires frequent blood checks of INR, as well as dietary changes and medications, can significantly impact its therapeutic levels

      The CHADSVASC score is used to gauge risk for thrombus formation, which factors in age, sex, h/o CHF, HTN, Stroke/TIA/DVT/PE, Vascular disease, or Diabetes. If the patient does not have a high risk of bleeding such as intracranial bleeding, GIB, or frequent falls, then they are usually started on an anticoagulant.

      Clinical Pearls

      Patient Specific

      The workup and treatment will depend on the patient’s symptoms and overall clinical picture. With AFIB, there is no one-size-fits-all approach!

      AFIB RVR

      Focus on rate control and anticoagulation! Become familiar with IV Cardizem and titrating a Cardizem drip, as well as IV Lopressor!

      Unstable = Shock

      Patients who are unstable should be electrically cardioverted with a synchronized shock. Remember to press SYNC, and the dose is 50-100J. These patients will require sedation and pain control (i.e. IV fentanyl).

      Want to learn more?

      If you want to learn more about cardiac arrhythmias, I have a complete video course “ECG Rhythm Master”, made specifically for nurses which goes into so much more depth and detail.

      With this course you will be able to:

      • Identify all cardiac rhythms inside and out
      • Understand the pathophysiology of why and how arrhythmias occur
      • Learn how to manage arrhythmias like an expert nurse
      • Become proficient with emergency procedures like transcutaneous pacing, defibrillation, synchronized shock, and more!

      I also include some great free bonuses with the course, including:

      • ECG Rhythm Guide eBook (190 pages!)
      • Code Cart Med Guide (code cart medication guide)
      • Code STEMI (recognizing STEMI on an EKG)

      Check out more about the course here!

      REFERENCES

      Burns, E. (2021). Atrial Fibrillation. In ECG Library. Retrieved from https://litfl.com/atrial-fibrillation-ecg-library/

      Kumar, K. (2022). Overview of atrial fibrillation. In T. W. Post (Ed.), UpToDate. Retrieved from https://www.uptodate.com/contents/overview-of-atrial-fibrillation

      Olshansky, B. (2022). The electrocardiogram in atrial fibrillation. In T. W. Post (Ed.), UpToDate. Retrieved from https://www.uptodate.com/contents/the-electrocardiogram-inatrial-fibrillation

      Phang, R., Prutkin, J. M., Ganz, L. I. (2022). Overview of atrial flutter. In T. W. Post (Ed.), UpToDate. Retrieved from https://www.uptodate.com/contents/overview-of-atrial-flutter

      Prutkins, J. M. (2022). Electrocardiographic and electrophysiologic features of atrial flutter. In T. W. Post (Ed.), UpToDate. Retrieved from https://www.uptodate.com/contents/electrocardiographic-and-electrophysiologic-features-of-atrial-flutter

      Blood Pressure Crash Course for nurses

      Blood Pressure

      Crash course for nurses

      William Kelly, MSN, FNP-C

      Author | Nurse Practitioner

      Blood pressure is one of the 5 vital signs, and it is so important to understand what normal and abnormal blood pressures are, and how we manage them (don’t get me started on the “6th” vital sign…).

      Within the hospital, vital signs are typically checked every 4 hours, and you will frequently run into both high and low blood pressures.

      Low blood pressure is often much more worrisome, and you may want to call an RRT if the BP is significantly low, especially when the patient is altered or has significant symptoms.

      High blood pressure is common, but often is not considered a big deal unless VERY high. In these cases, we want to slowly decrease the blood pressure instead of too quickly.

      What is Blood Pressure?

      As you probably know, blood pressure is not the pressure of your blood, but rather the pressure within your vascular system.

      The vascular system refers to your arteries and veins. When speaking of systemic blood pressure, we are specifically talking about the pressure in the arteries. 

      This pressure temporarily increases with each heartbeat, and decreases in-between each heartbeat. 

      The pressure in your arteries when your heart beats or contracts is called the systolic blood pressure. Systolic just means during the heartbeat. Systolic blood pressure can never be below the diastolic pressure.

      When the heart is not beating, the pressure “rests” back to its normal baseline pressure. This is called the diastolic blood pressure. The diastolic blood pressure should never be 0. 

      This pressure is measured in millimeters of mercury (mmHg).

      “Normal” Blood Pressure

      As we said above, systolic is the pressure during contraction of the heart, and diastolic is the pressure in-between beats. When looking at a blood pressure reading, there are two numbers: a numerator and a denominator. The numerator or top number is the systolic blood pressure. The denominator or the bottom number is the diastolic blood pressure.

      Normal systolic blood pressures are between 100 – 120 mmHG. Normal diastolic pressures are between 60-80 mm Hg. Traditionally 120/80 mmHg was considered the “gold standard” for blood pressure, but now its recommended to be at most 120/80 mmHg. 

      A "Good" Pressure

      A “good pressure” is relative. In the ER, a pressure below 160/90 tends to be considered pretty good and usually won’t require any medications. However, a pressure of 160/90 is considered very high if that is the normal daily blood pressure at home, and should be started on medications.

      How to Measure Blood Pressure

      We check people’s blood pressures in the hospital, in the outpatient office setting, and pretty much every area of patient care. Nowadays, we have machines that do most of it for us. But machines aren’t perfect, and its an essential nursing skill to know how to check blood pressure.

      In general, there are 3 main ways to check someone’s blood pressure:

      Manual Blood Pressure

      A manual blood pressure is checked using a sphygmomanometer and a stethoscope. The stethoscope if placed over the brachial artery, and the cuff is placed on the patient’s bicep.

      The cuff is pumped up to about 160 or 180 (in most people unless BP is very high). Slowly release the cuff pressure while you auscultate the brachial artery. 

      Systolic blood pressure is identified by the first Korotkoff clicking sound. The diastolic is noted when you can’t hear anything left.

      Palpating BP?

      You can palpate the patient’s radial artery when a machine or cuff is pumping up or down. When the radial artery disappears, this is your systolic pressure. There is no way to check diastolic with palpation

      Automated Blood Pressure

      An automated blood pressure is checked by a machine, often a portable Dinamap or a bedside monitor. These machines essentially perform a manual BP on their own.

      They have a sensor which detects tiny oscillations from your pulse. So when the pulse goes away – this is your systolic pressure. When the pulse reappears, this is your diastolic pressure.

      A-Line Blood Pressure

      Arterial lines are commonly placed in the ICU for strict BP monitoring. This is the most accurate way to check a blood pressure because it is directly measured by a sensor within the arteries, instead of indirectly like with the methods above. This gives you real-time changes in blood pressure.

      What’s the deal with the “MAP”?

      If you’ve been working for a bit, or in clinicals, you may hear about the term “MAP”. While systolic blood pressure is often considered the most important part of the blood pressure, the actual important number is the MAP. 

      The MAP stands for Mean Arterial Pressure. This is the average pressure in the arteries from one cardiac cycle (systolic + diastolic). This is measured by a calculation:

      But don’t go busting out your calculators. The bedside monitors should automatically calculate this for you, or possibly your EMR. If you need to calculate it, there are plenty of good online calculators to quickly do it. 

      MAP is a great indicator of tissue perfusion. If the MAP stays above 65 mmHg, then this should be enough pressure to provide essential tissue perfusion and prevent anoxic injury (injury from a lack of oxygen to the cells!).

      Nurses and Providers in the ICU will care much more about MAP than systolic blood pressure, especially when looking at low blood pressures.

      Hypertension

      Hypertension, also known as high blood pressure, comes in many different forms. While often thought of as “not a big deal”, it really is the silent killer, and can put a lot of strain on the heart, vasculature, and kidneys.

      Overtime, this organ damage becomes more pronounced, placing the patient at risk for heart disease, strokes, kidney failure, and more!

      Another reason why it’s termed the silent killer is because it often is asymptomatic – meaning there are no symptoms. But just because there aren’t any symptoms doesn’t mean it isn’t dangerous, especially in the long run. 

      In medicine, we use JNC8 guidelines to classify and manage hypertension. 

      Blood pressure levels include:

      Normal: < 120 / 80 mmHg
      Stage 1 HTN: 130 – 140 / 80-89 mmHg
      Stage 2 HTN: > 140 / 90 mmHg

      Normal Blood Pressure Levels

      Hypertension can be chronic or acute. Its also important to know if the patient is having any symptoms such as chest pain, SOB, headache, etc.

      3 main types of hypertension that we’ll talk about include:

      Primary Hypertension

      Primary hypertension, previously referred to as essential hypertension, is a chronic hypertension that has no clear cause, but is thought to involve genetic, dietary, and lifestyle factors. This is what most people are diagnosed with when they have high blood pressure. Risk factors include:

      • Increased age
      • Obesity
      • Family History of HTN
      • Black race
      • High sodium diet
      • Excessive ETOH
      • Sedentary lifestyle

      Hypertensive Urgency

      Hypertensive urgency is a very high blood pressure > 180/110 mmHg. While there is no evidence of organ damage (i.e. lack of symptoms or lab abnormalities), the patient is at risk for organ damage or strokes to occur.

      Hypertensive Emergency

      Hypertensive emergency is a very high blood pressure > 180/110 mmHg when there IS evidence of organ damage. The patient should have at least one of the following signs or symptoms:

      • Chest Pain or SOB
      • Pulmonary Edema
      • Severe headache, Seizures, or confusion
      • Elevated Troponin
      • Acute Kidney Injury (elevation in creatinine levels)

      Treatment of Hypertension:

      Treatment of hypertension is often not aggressive, and is often made by slow gradual changes to outpatient medication regimens.

      However, if the patient is symptomatic, blood pressure medications should be given. 

      At home blood pressures should be checked, as patients BPs are often higher in emergency and urgent care settings, and “White coat hypertension” is common. 

      Some oral medications used to lower BP include:

      • ACE Inhibitors like Lisinopril
      • ARBs like Losartan
      • Calcium channel blockers like Amlodipine
      • Beta-blockers like Labetalol
      • Diuretics like Hydrochlorothiazide
      • Alpha blockers like Clonidine

      In hypertensive urgency and when in the hospital, sometimes IV medications may be required including:

      • IV Hydralazine
      • IV Cardizem or Nicardipine
      • IV Labetalol
      • IV Lopressor (metoprolol)

      In general, blood pressure should never be lowered too fast. In severe cases, the goal should be to lower the MAP by 10-20% within the first hour, then another 5-15% over the next day. In many cases, this is less than 180/120 in the first hour, and less than 160/110 after 24 hours. 

      Lowering the blood pressure too quickly can actually cause ischemic damage in patients who have had elevated blood pressure for a long time. Basically the body becomes used to that high pressure, and while it is dangerous to have high blood pressure in general, lowering it too quickly can cause damage as well.

      BP & Symptoms

      When it comes to blood pressure (and even heart rates while we’re at it), its always important to ask the patient if they have any symptoms. Ask about any CP, SOB, dizziness, palpitations, headache, numbness/tingling/ etc.

      Hypotension

      Hypotension is when the blood pressure is too low. Low blood pressure is defined as any pressure less than 100/60 mmHg. However, this is often not considered true hypotension until below 90/50 mmHg.

      Patients who are small in stature and thin may have borderline low blood pressures at baseline.

      Trend Alert

      Worried about the patient’s BP? Trend what their BP has been this hospital visit, as well as previous hospital visits. If their BP is 92/48 but they always run around there and are asymptomatic otherwise – this is reassuring.

      Remember if the MAP is less than 65 mmHg, this places the patient at risk for tissue ischemia and organ damage. 

      Low blood pressure is often a serious sign, especially in the hospital setting. Common causes of hypotension include:

      Sepsis

      Septic shock is when there is a severe systemic response to infection. These patients will have persistent hypotension despite adequate fluid resuscitation (30ml/kg bolus). They usually require IV vasopressors, a central line, IV antibiotics, and ICU admission.

      Anaphylaxis

      Anaphylactic shock is a type of distributive shock that occurs with a severe allergy. Release of inflammatory mediators causes massive systemic vasodilation, swelling, and hypotension. This is treated with IV steroids and antihistamines, +/- epinephrine.

      Hemorrhage

      When the patient loses enough blood, they will become hypotensive. These patients need STAT blood, usually O negative blood that hasn’t been crossmatched. 

      Cardiogenic Shock

      Cardiogenic shock occurs when the heart can’t keep up with the body’s demand. This can occur in severe CHF or bradyarrhythmias.

      Drugs / Medications

      Maintenance medications given for blood pressure can cause low BP, especially if taken in wrong doses or if they become toxic. Some other medications have hypotension as a possible side effect such as amiodarone. 

      Adrenal insufficiency

      Patients with a history of adrenal insufficiency will often require stress-dosed steroids to maintain their blood pressure. 

      Severe dehydration

      Dehydration needs to be severe before the patient becomes hypotensive. This can occur in those with DKA or diabetes insipidus, or really anything that causes dehydration.

      Treatment of Hypotension:

      Treatment of hypotension will involve treating the underlying cause, but generally involves 2 steps:

      • IV Fluid boluses: to increase the volume of the blood
      • Vasopressors: To cause constriction of the blood vessels

      If fluid boluses do not improve blood pressure, or if the BP drops back again once its done, then the patient may need vasopressors in the ICU.

      Depending on the cause, the underlying cause should be addressed, including:

      • Blood for blood loss
      • Antibiotics and fluids for sepsis
      • Steroids for adrenal crisis
      • Steroids & Antihistamines for Anaphylaxis

      Wrapping Up

      You are going to run into TONS of patients who either have high blood pressure, or low blood pressure. Managing vital signs is a huge part of our jobs as nurses and doctors, and its so important to understand how to manage blood pressure!

      Remember these important concepts when it comes to blood pressure:

      Double Check the Pressure

      Double check your blood pressures. If it doesn’t seem right – check a manual BP. The provider may ask you to do this anyway.

      Always ask about Symptoms

      If your patients BP is high or low, ask them if they have any symptoms. Focus on any headache, chest pain, shortness of breath, dizziness, lightheadedness, palpitations, syncope, etc.

      Trend the Pressures

      Remember high blood pressure shouldn’t be corrected too quickly. Look at previous trends. Don’t freak out about blood pressures that are high unless the patient has symptoms. Worry more about low blood pressures!

      REFERENCES

      Basil, J., & Bloch, M. J. (2022). Overview of hypertension in adults. In T. W. Post (Ed.), Uptodate. https://www.uptodate.com/contents/evaluation-of-and-initial-approach-to-the-adult-patient-with-undifferentiated-hypotension-and-shock

      Calder, S. A. (2012). Shock. In B. B. Hammond & P. G. Zimmerman (Eds.), Sheey’s manual of emergency care (7th ed., pp. 213-221). Elsevier.

      Gaieski, D. F., & Mikkelsen, M. E. (2022). Evaluation of and initial approach to the adult patient with undifferentiated hypotension and shock. In T. W. Post (Ed.), Uptodatehttps://www.uptodate.com/contents/overview-of-hypertension-in-adults

      Roe, D. M. (2015). Cardiac emergencies. In B. A. Tscheschlog & A. Jauch (Eds.), Emergency nursing made incredibly easy! (2nd ed., pp. 97-197). Lippincott Williams & Wilkins.