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Zorluk: OrtaGeneral Internal Medicine

A 64-year-old man is evaluated on the medical ward on hospital day 3. He was initially admitted for community-acquired pneumonia and was started on empiric therapy with intravenous ceftriaxone and oral azithromycin. Upon admission, he had a temperature of 38.6°C (101.5°F), a respiratory rate of 24/min, and a right lower lobe infiltrate on chest radiography.

Today, the patient reports significant improvement in his cough and shortness of breath. His temperature is 37.1°C (98.8°F), blood pressure is 122/78 mm Hg, pulse is 76/min, and respiratory rate is 16/min. Pulse oximetry shows 97% on room air. He is tolerating an oral diet well. Sputum culture obtained on admission has grown heavy *Streptococcus pneumoniae*. Susceptibility testing results are as follows:

AntimicrobialInterpretation
AmoxicillinSusceptible
CeftriaxoneSusceptible
LevofloxacinSusceptible
AzithromycinResistant

Blood cultures have shown no growth after 72 hours. Which of the following is the most appropriate modification to this patient's pharmacologic management?

  1. Discontinue current medications and initiate oral amoxicillinCevap
  2. B
    Discontinue azithromycin and continue intravenous ceftriaxone
  3. C
    Discontinue current medications and initiate oral levofloxacin
  4. D
    Add intravenous vancomycin to the current regimen
  5. E
    Continue intravenous ceftriaxone and oral azithromycin

Cevap

Discontinue current medications and initiate oral amoxicillin
The correct answer describes the optimal application of antimicrobial stewardship. The patient has community-acquired pneumonia with a confirmed etiology of Streptococcus pneumoniae. He has reached clinical stability, meaning he is afebrile with normal vital signs, has improved respiratory symptoms, and is tolerating an oral diet. This makes him an ideal candidate for transition from intravenous to oral antibiotics. The sputum culture results demonstrate that the organism is susceptible to amoxicillin. Amoxicillin provides excellent, targeted oral coverage for susceptible S. pneumoniae. Transitioning to oral amoxicillin achieves both the necessary IV-to-PO conversion and the appropriate narrowing of the antimicrobial spectrum. Azithromycin must be stopped as the organism is resistant and empiric atypical coverage is no longer needed with a confirmed typical pathogen.

Adım Adım Çözüm

1
Assess the patient's clinical stability to determine readiness for transition to oral therapy.
The patient is afebrile, hemodynamically stable, has a normal respiratory rate, and is tolerating an oral diet.
Clinical stability indicates the patient is ready for a safe step-down from intravenous to oral antibiotics, reducing hospital length of stay and line-associated complications.
2
Review the sputum culture and susceptibility data to narrow the antibiotic spectrum.
The culture shows Streptococcus pneumoniae that is susceptible to amoxicillin, ceftriaxone, and levofloxacin, but resistant to azithromycin.
Core principles of antimicrobial stewardship require de-escalating from broad empiric therapy to the most targeted, narrow-spectrum agent once the primary pathogen is identified.

Anahtar Kavram

In patients with community-acquired pneumonia who achieve clinical stability, empiric intravenous antibiotics should be transitioned to a targeted, narrow-spectrum oral agent based on culture and susceptibility data.
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Konular

General Internal Medicine

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