A 35-year-old man presents to the clinic with an 8-day history of a persistent cough. He s… — USMLE Step 2 CK

A $35$ -year-old man presents to the clinic with an $8$ -day history of a persistent cough. He states that the cough is productive of yellowish sputum and is occasionally accompanied by mild retrosternal chest soreness. He reports having a runny nose and a low-grade fever that resolved $3$ days ago. He has no significant past medical history and does not smoke. Vital signs are temperature $37.2^\circ \text{C}$ ( $99.0^\circ \text{F}$ ), blood pressure $122/78 \, \text{mmHg}$ , pulse $78/\text{min}$ , and respiratory rate $16/\text{min}$ . Pulse oximetry is $98\%$ on room air. Physical examination reveals normal tympanic membranes, mild pharyngeal erythema without exudate, and clear lung fields bilaterally without wheezes, rhonchi, or crackles. Which of the following is the most appropriate next step in management?

Observation and symptomatic managementAnswer
B
Prescription for oral azithromycin
C
Prescription for oral amoxicillin
D
Prescription for oral levofloxacin
E
Sputum Gram stain and culture followed by targeted antibiotics

Answer

Observation and symptomatic management

The patient's presentation is classic for acute bronchitis, a lower respiratory tract infection primarily affecting the large airways. Over

90\%

of cases are caused by respiratory viruses (e.g., rhinovirus, influenza, coronavirus, RSV). The hallmarks are a cough lasting

1

3

weeks, often following a typical viral upper respiratory infection. Crucially, the presence of yellow or green sputum does NOT signify a bacterial infection; it simply reflects the presence of sloughed airway epithelial cells and neutrophils. Because the patient has normal vital signs and a normal pulmonary examination (no crackles, egophony, or tactile fremitus), community-acquired pneumonia is effectively ruled out. Therefore, chest radiography is unnecessary, and the most appropriate management is strict observation and symptomatic relief (e.g., NSAIDs, dextromethorphan, or guaifenesin). The administration of antibiotics for acute bronchitis is a major driver of antibiotic resistance and violates core principles of antimicrobial stewardship.

Step-by-Step Solution

Analyze the patient's clinical presentation and vital signs.

The patient has a cough lasting 8 days, purulent sputum, and prior URI symptoms, but normal vital signs and clear lung fields.

Differentiating uncomplicated acute bronchitis from community-acquired pneumonia requires assessing for systemic toxicity, abnormal vitals, and focal consolidation.

Determine the likely diagnosis.

The diagnosis is acute bronchitis, which is almost exclusively viral.

The absence of fever, tachycardia, tachypnea, and focal crackles makes bacterial pneumonia highly unlikely.

Select the appropriate management strategy based on antimicrobial stewardship principles.

Observation and symptomatic management are chosen.

Antibiotics do not improve outcomes in acute viral bronchitis. Purulent sputum alone is not an indication for antibiotics.

Key Concept

Antibiotic stewardship in acute bronchitis

Estimated Time:45s

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