A 45-year-old woman presents to the emergency department with a temperature of 38.6^{\circ… — USMLE Step 3

A $45$ -year-old woman presents to the emergency department with a temperature of $38.6^{\circ}\mathrm{C}$ ( $101.5^{\circ}\mathrm{F}$ ) measured at home. She is currently receiving adjuvant chemotherapy for early-stage breast cancer, with her last cycle administered $10$ days ago. She reports mild fatigue but no cough, dyspnea, abdominal pain, dysuria, or diarrhea. She is tolerating oral intake and lives with her husband $10$ minutes away from the hospital.

Vital signs are temperature $38.4^{\circ}\mathrm{C}$ ( $101.1^{\circ}\mathrm{F}$ ), blood pressure $118/76\mathrm{ mmHg}$ , pulse $92/\mathrm{min}$ , and respirations $14/\mathrm{min}$ . Physical examination reveals a well-appearing woman in no acute distress. There is no induration or erythema around her totally implantable venous access port.

Laboratory results show:

Test	Result	Reference Range
Hemoglobin	$11.2\mathrm{ g/dL}$	$12.0-16.0\mathrm{ g/dL}$
Platelets	$135,000/\mathrm{mm}^3$	$150,000-400,000/\mathrm{mm}^3$
Leukocytes	$800/\mathrm{mm}^3$	$4,500-11,000/\mathrm{mm}^3$
Absolute neutrophil count	$350/\mathrm{mm}^3$	$1,500-8,000/\mathrm{mm}^3$
Serum creatinine	$0.8\mathrm{ mg/dL}$	$0.6-1.2\mathrm{ mg/dL}$

Hepatic panel is within normal limits. Chest radiograph and urinalysis are unremarkable. Blood and urine cultures are obtained.

Which of the following is the most appropriate initial disposition and management plan?

Discharge home with oral ciprofloxacin and amoxicillin-clavulanateAnswer
B
Admit to the general medical floor and initiate intravenous cefepime
C
Admit to the intensive care unit and initiate intravenous vancomycin and cefepime
D
Discharge home without antibiotics and schedule an outpatient follow-up in 24 hours
E
Admit to an observation unit for 24 hours of intravenous fluids and withhold antibiotics pending culture results

Answer

Discharge home with oral ciprofloxacin and amoxicillin-clavulanate

The most appropriate disposition for this patient is discharge to home with empiric oral antibiotics. This patient presents with febrile neutropenia, defined as a single oral temperature of

\ge 38.3^{\circ}\mathrm{C}

(

101.0^{\circ}\mathrm{F}

) and an absolute neutrophil count (ANC)

< 500/\mathrm{mm}^3

. The critical next step in management is risk stratification to determine the appropriate care setting. This patient meets the criteria for low-risk febrile neutropenia (e.g., a high MASCC score) because she has a solid malignancy, is hemodynamically stable, has no significant medical comorbidities (such as COPD or heart failure), is tolerating oral intake, and has reliable outpatient support. The standard of care for low-risk patients is outpatient management. The chosen antibiotic regimen must provide broad-spectrum coverage, particularly against Pseudomonas aeruginosa (covered by ciprofloxacin) and other Gram-positive and anaerobic organisms (covered by amoxicillin-clavulanate).

Step-by-Step Solution

Identify the primary clinical syndrome from the patient's presentation and laboratory results.

The patient has a fever (

38.4^{\circ}\mathrm{C}

) and an absolute neutrophil count (ANC) of

350/\mathrm{mm}^3

, establishing the diagnosis of febrile neutropenia.

Febrile neutropenia is a medical emergency that requires immediate risk stratification to guide disposition and treatment.

Risk stratify the patient using clinical criteria (e.g., MASCC or CISNE scores).

The patient is low-risk: she has a solid tumor (breast cancer), normal vital signs, no medical comorbidities, tolerates oral intake, and lives close to the hospital.

Disposition decisions in febrile neutropenia depend entirely on whether the patient is classified as high-risk or low-risk.

Determine the appropriate care setting and treatment regimen for a low-risk patient.

Outpatient disposition (discharge home) with broad-spectrum oral antibiotics covering Pseudomonas aeruginosa and Gram-positive organisms is indicated.

Evidence shows that outpatient management with oral fluoroquinolones (ciprofloxacin) and amoxicillin-clavulanate is safe and effective for low-risk febrile neutropenia, avoiding unnecessary hospitalization.

Key Concept

Patients with low-risk febrile neutropenia (solid tumors, stable vitals, no comorbidities, tolerating PO) should be managed in the outpatient setting with broad-spectrum oral antibiotics.

Estimated Time:1m 30s

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