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Difficulty: EasyPulmonary and Critical Care

A 45-year-old woman is evaluated in the urgent care clinic for a three-day history of chills, malaise, and a cough productive of rust-colored sputum. She takes no daily medications and has no chronic medical conditions. Vital signs show a temperature of 38.4∘C38.4^\circ\text{C} (101.1∘F101.1^\circ\text{F}), blood pressure of 118/76 mmHg118/76\text{ mmHg}, heart rate of 92/min92/\text{min}, and respiratory rate of 18/min18/\text{min}. Oxygen saturation is 96%96\% on room air. Auscultation of the chest reveals focal crackles and egophony at the left lung base. A point-of-care chest radiograph demonstrates a left lower lobe consolidation without pleural effusion. Which of the following is the most appropriate next step in management?

  1. Prescribe oral amoxicillinAnswer
  2. B
    Prescribe oral levofloxacin
  3. C
    Prescribe oral amoxicillin-clavulanate and azithromycin
  4. D
    Administer intravenous ceftriaxone and admit to the hospital
  5. E
    Prescribe oral furosemide

Answer

Prescribe oral amoxicillin
The correct intervention is to prescribe oral amoxicillin. This patient presents with classic signs and symptoms of community-acquired pneumonia (CAP), including fever, productive cough, focal crackles, and a lobar consolidation on chest radiography. Her stable vital signs and CURB-65 score of 0 indicate she is perfectly suited for outpatient management. According to the American Thoracic Society (ATS) and Infectious Diseases Society of America (IDSA) guidelines, empiric treatment for outpatient CAP in previously healthy adults without major comorbidities should consist of high-dose oral amoxicillin, oral doxycycline, or an oral macrolide (in areas with low pneumococcal macrolide resistance). Amoxicillin provides excellent targeted coverage against Streptococcus pneumoniae, the most common typical bacterial pathogen causing CAP.

Step-by-Step Solution

1
Evaluate the clinical presentation and diagnostic findings.
The patient has symptoms (fever, productive cough), physical exam findings (focal crackles, egophony), and imaging (lobar consolidation) diagnostic of community-acquired pneumonia (CAP).
Establishing the correct diagnosis prevents misapplication of therapies intended for other conditions like heart failure.
2
Determine the appropriate setting of care.
The patient is hemodynamically stable, has no hypoxemia, is not confused, and is under 65 years old (CURB-65 score = 0). She can be treated as an outpatient.
Severity of illness dictates whether outpatient oral therapy or inpatient intravenous therapy is required.
3
Identify comorbidities to guide empiric antibiotic selection.
The patient has no chronic medical conditions and no reported recent antibiotic use.
Current infectious disease guidelines stratify empiric CAP treatment based strictly on the presence or absence of comorbidities.
4
Select the guideline-concordant antibiotic.
High-dose oral amoxicillin (or alternatively, doxycycline or a macrolide if local resistance is low) is the correct monotherapy.
Using narrow-spectrum agents in healthy individuals ensures good antibiotic stewardship and prevents resistance.

Key Concept

Outpatient empiric management of community-acquired pneumonia in healthy adults
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Topics

Pulmonary and Critical Care

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