Management of Febrile Neutropenia and Agranulocytosis

Definition and Initial Assessment

Febrile neutropenia is defined as a single oral temperature of ≥38.3°C (101°F) or a temperature of ≥38.0°C (100.4°F) sustained over one hour in a patient with an absolute neutrophil count (ANC) <0.5×10^9/L 1
Warning signs requiring immediate intervention include hypotension (systolic BP <90 mmHg), respiratory distress, and hypoxemia 1
Signs of infection may be minimal in neutropenic patients, especially those on corticosteroids, requiring vigilance even with low-grade fever 1

Obtain blood cultures from peripheral vein and all indwelling catheters before starting antibiotics 1
Collect other relevant cultures (urine, sputum, skin swabs) as clinically indicated 1
Immediately assess circulatory and respiratory function, with vigorous resuscitation if necessary 1

For most patients: Monotherapy with anti-pseudomonal cephalosporin (e.g., cefepime 2g IV every 8 hours) or carbapenem 1
For high-risk patients (prolonged neutropenia, bacteremia, septic appearance): Combination therapy with β-lactam plus aminoglycoside 1
Consider adding vancomycin for patients who appear septic at initial presentation 2
Discontinue vancomycin after 48-72 hours if blood cultures remain negative 2

Consider these risk factors when selecting therapy: Duration of profound granulocytopenia, type of underlying cancer and chemotherapy, signs and symptoms of severe infection 3

Central line infections: Add vancomycin and administer through the line when possible 1
Cellulitis: Add vancomycin to broaden coverage against skin pathogens 1, 4
Candidosis: Initiate fluconazole, with early switch to alternative antifungal if inadequate response 1

Perform frequent clinical assessment (every 2-4 hours in severe cases) 1
If afebrile and ANC ≥0.5×10^9/L at 48 hours: Consider changing to oral antibiotics for low-risk patients 1
If still febrile at 48 hours: Continue initial antibacterial therapy for clinically stable patients, broaden antibiotic coverage and seek infectious disease consultation for clinically unstable patients 1
Consider fungal infection if fever persists despite broad-spectrum antibiotics 5

Consider empiric antifungal therapy (amphotericin B) after 4-7 days of persistent fever despite broad-spectrum antibiotics 2, 3
This approach has been shown to reduce morbidity and mortality from fungal pathogens 3

For patients with microbiological documentation: Continue antibiotics for at least 7 days 5, 6
For patients without microbiological documentation: Continue antibiotics for 7 days; aminoglycoside can be discontinued earlier in most cases 5, 6
For patients with resolved neutropenia: Discontinue antibiotics if neutrophil count ≥0.5×10^9/L, patient is afebrile for 48 hours, and blood cultures are negative 1
For high-risk cases: Continue antibiotics for up to 10 days or until neutrophil recovery in patients with acute leukemia or post-high-dose chemotherapy 1

Do not delay antibiotic administration while waiting for cultures 1
Early discontinuation of antibiotics in responding patients may lead to recurrent febrile illness and documented bacterial infections 7
Prolonged antimicrobial treatment in patients with persistent neutropenia has been associated with superinfections, particularly fungal infections 5