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Zorluk: OrtaInfectious Diseases

A 29-year-old female graduate student presents to the university health clinic complaining of burning with urination and increased urinary frequency for the past 4848 hours. She denies any back pain, nausea, vomiting, or vaginal discharge. Her temperature is 37.0∘C37.0^\circ\text{C} (98.6∘F98.6^\circ\text{F}), blood pressure is 110/70 mm Hg110/70\text{ mm Hg}, and pulse is 78/min78\text{/min}. Physical examination demonstrates mild suprapubic discomfort on deep palpation but no costovertebral angle tenderness. A urine sample collected at an outside urgent care facility three days ago has just returned positive for *Klebsiella pneumoniae*. The microbiology report flags the isolate as an extended-spectrum beta-lactamase (ESBL) producer. Susceptibility testing reveals resistance to ceftriaxone, cefepime, and ciprofloxacin, but confirms susceptibility to nitrofurantoin, fosfomycin, and meropenem. Which of the following is the most appropriate next step in management?

  1. Oral nitrofurantoin therapyCevap
  2. B
    Intravenous meropenem therapy
  3. C
    Intramuscular ceftriaxone administration
  4. D
    Oral ciprofloxacin therapy
  5. E
    Intravenous piperacillin-tazobactam therapy

Cevap

Oral nitrofurantoin therapy is the most appropriate treatment.
The correct approach is to prescribe oral nitrofurantoin. The patient's clinical presentation of dysuria, frequency, and suprapubic pain without fever or flank pain is diagnostic of uncomplicated cystitis. Although the causative pathogen is an ESBL-producing organism, these bacteria often retain susceptibility to nitrofurantoin and fosfomycin. Nitrofurantoin reaches high concentrations in the lower urinary tract and is highly effective for cystitis. Choosing this oral agent allows for convenient outpatient management and adheres to strict antimicrobial stewardship guidelines by avoiding the unnecessary use of broad-spectrum intravenous carbapenems (which must be reserved for severe, systemic infections).

Adım Adım Çözüm

1
Assess the clinical syndrome based on the patient's presentation.
The diagnosis is uncomplicated acute cystitis.
The patient has localized symptoms (dysuria, frequency, suprapubic pain) and lacks systemic signs such as fever, vomiting, or costovertebral angle tenderness that would suggest pyelonephritis.
2
Analyze the microbiology and susceptibility data.
The causative organism is an ESBL-producing *Klebsiella pneumoniae* that is susceptible to oral nitrofurantoin and fosfomycin, as well as intravenous meropenem.
Identifying the specific resistance pattern is crucial for selecting effective pharmacotherapy.
3
Select the optimal antimicrobial agent.
Oral nitrofurantoin is chosen.
Nitrofurantoin provides effective, narrow-spectrum coverage for ESBL cystitis in an outpatient setting, adhering to antimicrobial stewardship by sparing the use of broad-spectrum intravenous carbapenems.

Anahtar Kavram

Uncomplicated cystitis caused by extended-spectrum beta-lactamase (ESBL)-producing Enterobacteriaceae should be treated with narrow-spectrum oral agents like nitrofurantoin or fosfomycin to avoid unnecessary use of intravenous carbapenems.
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