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Febrile Neutropenia, Quick 3-Step Approach

Fever + ANC less than 500 = medical emergency

1. Screen

Recent chemo (less than 6 weeks)?

2. Risk Stratify

High risk = (unstable, prolonged neutropenia, heme malignancy)

3. Treat (start ASAP)

Antipseudomonal for ALL

Inpatient: cefepime / pip-tazo / meropenem

Outpatient: cipro (preferred) or levofloxacin

Add:

MRSA coverage if unstable, colonized, line/skin source

Antifungal if ANC less than 200, heme malignancy, fever greater than 3–7 days

Stop when:

Source treated OR 7–10 days + negative cultures (48h) + afebrile ~5 days + ANC recovery (greater than 1000)

Transcript 

Goals

  1. Screen febrile patients. 
  2. Identify which patients are low risk and could be treated outpatient.
  3. Decide the type and duration of antibiotic therapy for a patient with febrile neutropenia. 

Scene 3: How do we manage febrile neutropenia? Let’s talk through this in 3 steps:

#1: Screening. 

#2: Risk stratification.

#3: Choosing appropriate antibiotics. 

Scene 4: 

#1: Screen patients with fevers for possible neutropenia. 

Febrile neutropenia is a fever in a patient with an absolute neutophil count < 500 cell/ml. Guidelines recommend workup of febrile neutropenia within 15 minutes. You may not have access to labs by 15 minutes Or if you don’t have much history to go off of, so how can we determine who of our febrile patients could be neutropenic. A key screening question is “Have you had chemotherapy in the last 6 weeks?” The reason why asking about if they had chemotherapy within a month or so helps is because you can expect neutrophils to drop after 10-14 days of receiving chemo.

If yes, this patient could have febrile neutropenia. 

Scene 5: 

#2: Risk stratification. We need to risk-stratify who could potentially be treated as an outpatient vs those who need inpatient care. 

Lower-risk patients include those with stable vitals and those with shorter durations of chemotherapy. 

And often it is patients with solid tumor malignancy who may be managed outpatient,  unlike patients who have hematologic malignancy who have a double hit with the cancer in their bone marrow on top of the chemotherapy-induced neutropenia.

And if you are not sure who might be lower risk, you can use validated risk calculators (maybe have the names pop up without saying it) that are linked in the description.

Scene 6: #3: Choose antibiotics.  

  • All patients with febrile neutropenia need an antipseudomonal agent. 
    • If inpatient this could be cefepime, piperacillin-tazobactam, or meropenem. 
    • If we are deescalting to oral options or in the outpatient setting, this would ciprofloxacin or levofloxacin. Cipro is preferred due to it’s superior Pseudomonas activity.
  • MRSA coverage can be added if 1) there is significant hemodynamic instability or 2) there is known MRSA coloniziation OR you suspect their infectious source is due to MRSA – such as from a soft tissue wound or an indwelling line
  • Lastly, antifungal coverage can be added IF they are high risk for fungal disease which includes ANC < 200 for at lest 2-3 days or with a hematologic malignancy. It is also recommended to add antifungal coverage if the patient has not responded to antibiotics despite 3-7 days of treatment. 

When should we stop antibiotics?

  • If a source is identified, antibiotics should continue to cover that specific infection (such as with bacteremia or endocarditis)
  • If no source is identified, most patients will receive antibiotics for 7-10 days. We also watch for negative blood cultures at 48hrs, ensure they are afebrile for ~ 5 days, and some clinicians like to know the patient’s ANC has recovered at least to >1000. 

Let’s put it all together. Our three steps for management of febrile neutropenia include:: 

#1 Screen for possible neutropenia in febrile patients – if you don’t know their history, ask if they have been on chemo in the last 6 weeks?

#2 Risk-stratify the patient to determine if they can be treated outpatient or inpatient. Factors include their hemodynamics, severity, and duration of neutropenia, and type of malignancy.

#3 Initiate antibiotics within 1hr. Everyone needs pseudomonal coverage, some may need MRSA coverage based on their personal risk factors and possible source, and some may even need antifungal coverage if they have ANC < 200 or are not improving after 3-7 days on current antibiotic therapy. 

Thanks so much for watching. For more learning on neutropenia, watch out for our part 1 video on differential and work up of neutropenia and check out the CoreIM episode Neutropenia 5 Pearls on spotify, apple podcasts and on youtube. See you next time. 

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Neutropenia: 5 Pearls Segment