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Zorluk: OrtaInfectious Diseases

A 6868-year-old man is evaluated in the hospital for a new-onset fever. He was admitted 55 days ago for an acute exacerbation of chronic obstructive pulmonary disease, which has significantly improved with intravenous corticosteroids and bronchodilators. A Foley catheter was placed on admission for strict fluid monitoring but was removed 4848 hours later. Yesterday, he developed a fever of 38.6∘C38.6^\circ\text{C} (101.5∘F101.5^\circ\text{F}), dysuria, and suprapubic tenderness. Urinalysis revealed 5050 leukocytes per high-power field and positive leukocyte esterase. He was empirically started on intravenous piperacillin-tazobactam and vancomycin. Today, the patient's fever has resolved, his urinary symptoms are improving, and he is tolerating an oral diet. Blood cultures drawn concurrently have no growth to date. Cardiac examination reveals a regular rate and rhythm with no murmurs. Urine culture from yesterday grows >100,000>100,000 CFU/mL of *Enterococcus faecalis*. Susceptibility testing demonstrates that the isolate is susceptible to ampicillin, vancomycin, and linezolid.

Which of the following is the most appropriate next step in the management of this patient's infection?

  1. Transition to oral amoxicillinCevap
  2. B
    Continue intravenous vancomycin and discontinue piperacillin-tazobactam
  3. C
    Transition to oral linezolid
  4. D
    Transition to oral ciprofloxacin
  5. E
    Transition to oral cephalexin

Cevap

Transition to oral amoxicillin
The correct approach is stepping down to oral amoxicillin. This patient has a symptomatic catheter-associated urinary tract infection (CAUTI) caused by *Enterococcus faecalis*. Since the patient is now afebrile, clinically improving, and tolerating oral intake, the empiric broad-spectrum intravenous regimen should be de-escalated to a targeted oral agent. Amoxicillin is the oral equivalent of ampicillin; it provides excellent bioavailability, concentrates well in the urine, and optimally covers the susceptible *E. faecalis* isolate. This strongly adheres to the core principles of antibiotic stewardship.

Adım Adım Çözüm

1
Evaluate the patient's clinical trajectory and microbiology results.
The patient is afebrile, clinically improving, and tolerating oral intake. Urine cultures yield ampicillin-susceptible Enterococcus faecalis.
Determining clinical stability and pathogen susceptibilities is required to decide whether step-down therapy is appropriate and which agent to use.
2
Select the most appropriate targeted antimicrobial therapy.
Oral amoxicillin is chosen to target the ampicillin-susceptible E. faecalis.
Antibiotic stewardship principles dictate stepping down from broad-spectrum empiric intravenous therapy to a targeted, narrow-spectrum oral agent once the pathogen is identified.
3
Rule out inappropriate alternatives.
Cephalosporins, fluoroquinolones, and broad-spectrum agents (vancomycin, linezolid) are excluded.
Enterococci are intrinsically resistant to cephalosporins. Broad-spectrum agents are unnecessarily broad and carry higher toxicity risks.

Anahtar Kavram

Antibiotic Stewardship and Enterococcal Infections
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Konular

Infectious Diseases

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