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Zorluk: ZorInfectious Diseases

A 74-year-old man is admitted to the intensive care unit with septic shock secondary to a severe complicated urinary tract infection. He has a history of neurogenic bladder managed with clean intermittent catheterization. On admission, his temperature is 39.2∘C39.2^\circ\text{C} (102.6∘F102.6^\circ\text{F}), blood pressure is 82/50 mmHg82/50\text{ mmHg}, and heart rate is 118/min118/\text{min}. He receives aggressive fluid resuscitation and is started on empiric intravenous piperacillin-tazobactam and vancomycin. By hospital day 3, his condition has significantly improved; he is afebrile, hemodynamically stable off vasopressors, and transferred to the general medical floor. Blood cultures and a urine culture obtained on admission both yield *Enterococcus faecalis*. Susceptibility testing indicates the organism is sensitive to ampicillin, vancomycin, linezolid, and daptomycin, but intrinsically resistant to cephalosporins. Which of the following is the most appropriate next step in pharmacotherapy?

  1. Discontinue the current regimen and begin intravenous ampicillinCevap
  2. B
    Discontinue vancomycin and continue intravenous piperacillin-tazobactam
  3. C
    Discontinue piperacillin-tazobactam and continue intravenous vancomycin
  4. D
    Discontinue the current regimen and begin intravenous daptomycin
  5. E
    Continue the current regimen of piperacillin-tazobactam and vancomycin

Cevap

Discontinue the current regimen and begin intravenous ampicillin
Intravenous ampicillin is the drug of choice for susceptible Enterococcus faecalis. The cornerstone of antimicrobial stewardship is de-escalation: once a patient who initially required empiric broad-spectrum antibiotics (for conditions like septic shock) stabilizes and specific susceptibility data returns, the regimen must be narrowed to the most targeted agent available. Ampicillin provides excellent bactericidal activity against susceptible enterococci without the unnecessary broad-spectrum gram-negative, anaerobic, or MRSA coverage provided by the empiric regimen.

Adım Adım Çözüm

1
Evaluate the patient's clinical trajectory and culture data.
The patient has stabilized from septic shock, and cultures have identified Enterococcus faecalis as the sole pathogen.
Clinical stability and pathogen identification mandate transitioning from empiric to definitive targeted therapy.
2
Analyze the susceptibility profile of the isolated pathogen.
The isolate is susceptible to multiple agents, including ampicillin, vancomycin, linezolid, and daptomycin.
To select the most effective agent with the narrowest possible spectrum.
3
Apply antimicrobial stewardship principles to select definitive therapy.
Ampicillin is selected to replace the broad-spectrum piperacillin-tazobactam and vancomycin.
Ampicillin is the gold-standard, targeted therapy for susceptible E. faecalis, minimizing collateral microbiome damage and preventing resistance.

Anahtar Kavram

Once a patient stabilizes and culture sensitivities are available, empiric broad-spectrum antibiotics must be de-escalated to the narrowest effective targeted therapy (e.g., ampicillin for susceptible E. faecalis) to practice proper antimicrobial stewardship.
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Infectious Diseases

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