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Difficulty: MediumInfectious Diseases

A 47-year-old woman is evaluated on her third day of hospitalization for community-acquired pneumonia. At the time of admission, empiric therapy with intravenous ceftriaxone and oral azithromycin was initiated. She currently feels much better, and her cough has significantly decreased. Vital signs are temperature 37.0°C (98.6°F), blood pressure 124/76 mm Hg, pulse 78/min, and respirations 14/min. Oxygen saturation is 98% on room air. Sputum culture collected prior to antibiotic administration now grows Streptococcus pneumoniae. Susceptibility testing indicates the isolate is highly susceptible to penicillin, ceftriaxone, macrolides, and respiratory fluoroquinolones. The patient is tolerating a regular diet and has adequate gastrointestinal absorption. Which of the following is the most appropriate next step in pharmacotherapy?

  1. Transition to oral amoxicillinAnswer
  2. B
    Transition to oral moxifloxacin
  3. C
    Transition to oral linezolid
  4. D
    Transition to oral cefuroxime
  5. E
    Maintain the current regimen of intravenous ceftriaxone and oral azithromycin

Answer

Transition to oral amoxicillin
The correct next step is to transition the patient to oral amoxicillin. This patient with community-acquired pneumonia has met the criteria for clinical stability (afebrile, normal heart rate, normal blood pressure, normal respiratory rate, and resolving symptoms) and is tolerating oral intake. Therefore, she should be transitioned from intravenous to oral antibiotics. Furthermore, her sputum culture grew Streptococcus pneumoniae that is susceptible to penicillin. The core principle of antibiotic stewardship requires narrowing the spectrum of coverage to the most targeted, effective agent once susceptibility data are available. High-dose oral amoxicillin is the preferred narrow-spectrum agent for penicillin-susceptible S. pneumoniae.

Step-by-Step Solution

1
Assess the patient's clinical stability for transition to oral therapy.
The patient is afebrile, hemodynamically stable, has improving respiratory symptoms, and is tolerating a regular diet.
Intravenous to oral transition should occur as soon as the patient demonstrates clinical improvement and has functional gastrointestinal absorption to minimize catheter-related risks and facilitate discharge.
2
Evaluate the microbiology results and susceptibility data.
Sputum culture confirmed Streptococcus pneumoniae that is susceptible to penicillin and other standard agents.
Empiric broad-spectrum therapy must be de-escalated to a targeted regimen once a causative pathogen is identified and susceptibilities are known.
3
Select the most appropriate narrow-spectrum oral antibiotic.
Oral amoxicillin is chosen.
Amoxicillin provides excellent, narrow-spectrum coverage against penicillin-susceptible S. pneumoniae, aligning with the principles of antimicrobial stewardship by reducing the risk of resistance and adverse effects associated with broader agents.

Key Concept

Antibiotic stewardship in community-acquired pneumonia requires transitioning from broad-spectrum empiric intravenous therapy to targeted, narrow-spectrum oral therapy (such as amoxicillin for susceptible Streptococcus pneumoniae) once the patient is clinically stable and culture results are available.
Estimated Time:1m 15s
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Topics

Infectious Diseases

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