A 6-year-old girl from Mumbai with newly diagnosed B-cell acute lymphoblastic leukemia (ALL) has completed 4 weeks of induction chemotherapy. Bone marrow aspirate shows <5% blasts (complete remission achieved). However, she now presents with severe mucositis, oral candidiasis, and a fever of 39.2°C. Her absolute neutrophil count (ANC) is 200/μL. What is the most appropriate next step in management?

Explanation

## Clinical Context This child is in complete remission (CR) after induction but has developed febrile neutropenia (ANC <500/μL with fever ≥38.5°C) complicated by severe mucositis and oral candidiasis. This is a medical emergency requiring prompt intervention to prevent sepsis and treatment-related mortality. ## Why the Correct Answer is Best **Key Point:** Febrile neutropenia in a leukemia patient is an oncologic emergency. Chemotherapy must be deferred, empiric broad-spectrum antibiotics started immediately, and supportive measures intensified. ### Immediate Management Steps: 1. **Defer next chemotherapy cycle** — continuing chemotherapy in severe neutropenia (ANC 200/μL) with active infection is contraindicated and increases mortality risk 2. **Initiate broad-spectrum antibiotics** — empiric coverage (e.g., piperacillin-tazobactam or ceftazidime + aminoglycoside) within 1 hour of fever recognition 3. **Add antifungal therapy** — oral candidiasis suggests fungal burden; fluconazole or amphotericin B depending on severity 4. **Obtain cultures** — blood cultures (peripheral and from any central line), urine culture, and stool culture to guide targeted therapy 5. **Consider G-CSF** — granulocyte-colony stimulating factor accelerates ANC recovery and reduces infection duration 6. **Supportive care** — IV fluids, electrolyte monitoring, nutritional support, and mouth care **Clinical Pearl:** Febrile neutropenia mortality in pediatric leukemia can exceed 10% if antibiotics are delayed. The "golden hour" principle applies: empiric antibiotics within 60 minutes of fever recognition significantly improve outcomes. **High-Yield:** In chemotherapy-induced neutropenia with fever, empiric broad-spectrum antibiotics are initiated *before* culture results. Waiting for culture results increases mortality risk. **Mnemonic:** **FEVER** = **F**ebrile (≥38.5°C), **E**mergency (start antibiotics <1 hour), **V**ascular access (blood cultures), **E**mpiric coverage (broad-spectrum), **R**ecovery support (G-CSF, fluids). ## Management Flowchart ```mermaid flowchart TD A[Febrile neutropenia in leukemia patient]:::urgent --> B{ANC <500/μL + fever ≥38.5°C?}:::decision B -->|Yes| C[Defer chemotherapy]:::action C --> D[Obtain blood, urine, stool cultures]:::action D --> E[Start empiric broad-spectrum antibiotics <1 hour]:::action E --> F[Add antifungal if candidiasis present]:::action F --> G[Consider G-CSF for ANC recovery]:::action G --> H[Supportive care: IV fluids, electrolytes, nutrition]:::action H --> I[Monitor ANC recovery]:::outcome I --> J{ANC >500/μL × 2 days + afebrile?}:::decision J -->|Yes| K[Resume chemotherapy]:::action J -->|No| L[Continue support, reassess]:::action ``` ## Comparison: Febrile Neutropenia Management in Leukemia | Feature | Correct Approach | Common Error | |---------|------------------|---------------| | **Timing of antibiotics** | Within 1 hour of fever | Waiting for culture results | | **Chemotherapy** | Defer until ANC recovery | Continue as planned | | **Culture timing** | Before antibiotics, if possible | After antibiotics started | | **G-CSF** | Consider early use | Withhold unnecessarily | | **Antifungal** | Empiric if candidiasis present | Delayed or omitted | | **Outcome** | Improved survival | Increased sepsis/mortality |