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Zorluk: OrtaInfectious Diseases

A 71-year-old woman who resides in a skilled nursing facility is currently receiving care in the intensive care unit for septic shock. She initially presented 48 hours ago with a temperature of 39.2°C (102.6°F), lethargy, and severe hypotension. A chronically encrusted indwelling urinary catheter was identified as the suspected source and immediately removed. Due to her frequent healthcare exposure and risk for multidrug-resistant organisms, empiric antimicrobial therapy was initiated with meropenem and linezolid. She has improved significantly over the past two days, and vasopressor support has been successfully discontinued. Current vital signs are temperature 37.1°C (98.8°F), blood pressure 122/78 mm Hg, pulse 84/min, and respirations 16/min. Finalized results from both blood and urine cultures isolate Proteus mirabilis. Susceptibility testing reveals the organism is resistant to tetracycline but fully susceptible to ampicillin, ceftriaxone, cefepime, piperacillin-tazobactam, and meropenem. Which of the following is the most appropriate pharmacological intervention at this time?

  1. Narrow the antimicrobial therapy to ceftriaxoneCevap
  2. B
    Continue the current meropenem and linezolid therapy
  3. C
    Discontinue linezolid and complete the course with meropenem
  4. D
    Transition the antimicrobial therapy to cefepime
  5. E
    Transition the antimicrobial therapy to piperacillin-tazobactam

Cevap

Narrow the antimicrobial therapy to ceftriaxone
Once a pathogen is identified and susceptibility testing is finalized, empiric broad-spectrum antimicrobial therapy should be narrowed to the most targeted, effective agent available. This patient has a Proteus mirabilis bloodstream infection secondary to a urinary source. The isolate is fully susceptible to ceftriaxone, a third-generation cephalosporin. Utilizing ceftriaxone provides adequate targeted coverage while minimizing unnecessary exposure to ultra-broad-spectrum agents, thereby adhering strictly to antimicrobial stewardship guidelines.

Adım Adım Çözüm

1
Evaluate the patient's clinical trajectory and culture data.
The patient has stabilized, and cultures have isolated Proteus mirabilis susceptible to several narrower-spectrum antibiotics.
Empiric broad-spectrum therapy is indicated initially for sepsis, but therapy must be reassessed once microbiological data is available.
2
Apply principles of antimicrobial stewardship to select the definitive treatment.
Identify ceftriaxone as the most targeted, effective option among the susceptible choices.
De-escalation to the narrowest effective agent minimizes adverse effects, reduces hospital costs, and limits the development of antimicrobial resistance.

Anahtar Kavram

Antimicrobial stewardship requires the de-escalation of empiric broad-spectrum antibiotics to the narrowest effective targeted therapy once culture and susceptibility data are finalized.
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Infectious Diseases

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