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Difficulty: EasyInfectious Diseases

A 42-year-old man is hospitalized for community-acquired pneumonia. On admission, he presented with a temperature of 38.9°C (102.0°F), a productive cough, and a right lower lobe infiltrate on chest radiograph. He was empirically started on intravenous ceftriaxone and azithromycin. On hospital day 3, his temperature is 37.1°C (98.8°F), blood pressure is 122/78 mm Hg, pulse is 78/min, and oxygen saturation is 97% on room air. He is tolerating a regular diet and states he is feeling much better. Sputum cultures collected on admission have grown Streptococcus pneumoniae. Susceptibility testing shows the isolate is sensitive to penicillin, amoxicillin, ceftriaxone, levofloxacin, and vancomycin. Which of the following is the most appropriate next step in management?

  1. Discontinue current antibiotics and start oral amoxicillinAnswer
  2. B
    Continue intravenous ceftriaxone and azithromycin
  3. C
    Discontinue current antibiotics and start oral levofloxacin
  4. D
    Discontinue current antibiotics and start oral amoxicillin-clavulanate
  5. E
    Discontinue current antibiotics and start intravenous ampicillin

Answer

Discontinue current antibiotics and start oral amoxicillin
The patient has demonstrated significant clinical improvement, is hemodynamically stable, and is tolerating an oral diet. These factors make him an ideal candidate for intravenous-to-oral antibiotic transition. The sputum culture definitively identified Streptococcus pneumoniae that is sensitive to penicillin and amoxicillin. According to core principles of antimicrobial stewardship, empiric broad-spectrum therapy should be narrowed to the most targeted, effective agent available once susceptibility data returns. Oral amoxicillin provides excellent coverage for susceptible S. pneumoniae without inducing unnecessary broad-spectrum selection pressure.

Step-by-Step Solution

1
Evaluate the patient's clinical trajectory and stability on hospital day 3.
The patient is afebrile, hemodynamically stable, maintaining normal oxygen saturation on room air, and tolerating an oral diet.
Establishing clinical stability is the primary requirement for safely transitioning a patient from intravenous to oral antibiotics.
2
Analyze the sputum culture and susceptibility results to guide targeted therapy.
The identified pathogen is Streptococcus pneumoniae, which testing confirms is susceptible to narrow-spectrum beta-lactams including penicillin and amoxicillin.
Culture data allows clinicians to de-escalate from broad-spectrum empiric therapy to a targeted regimen, minimizing collateral damage to normal flora.
3
Select the most appropriate definitive therapeutic agent.
Oral amoxicillin is chosen to complete the treatment course.
It offers highly effective, targeted therapy against the susceptible isolate and facilitates safe hospital discharge.

Key Concept

Antibiotic stewardship principles dictate transitioning from broad-spectrum intravenous therapy to targeted, narrow-spectrum oral therapy once clinical stability is achieved and culture susceptibilities are known.
Estimated Time:1m 0s
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Infectious Diseases

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