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Zorluk: KolayInfectious Diseases

An otherwise healthy 24-year-old university student presents to the student health center reporting discomfort when urinating. Vital signs show a temperature of 37.0°C (98.6°F), blood pressure of 118/76 mmHg, and a heart rate of 78/min. She reports that she has been urinating more frequently than usual over the past 48 hours. She has not experienced any fevers, chills, nausea, back pain, or abnormal vaginal discharge. An abdominal examination demonstrates mild tenderness located just above the pubic symphysis, but there is no pain elicited upon percussion of the costovertebral angles bilaterally. A clean-catch urine specimen is analyzed and demonstrates positive results for both leukocyte esterase and nitrites. Which of the following is the most appropriate empiric pharmacotherapy for this patient?

  1. A
    Intravenous ceftriaxone
  2. B
    Oral amoxicillin-clavulanate
  3. C
    Oral ciprofloxacin
  4. Oral nitrofurantoinCevap
  5. E
    Oral moxifloxacin

Cevap

Oral nitrofurantoin is the most appropriate empiric therapy.
The correct answer provides a narrow-spectrum antibiotic that achieves excellent concentrations in the lower urinary tract. This patient's presentation of dysuria, frequency, and suprapubic pain without systemic symptoms (fever, chills) or costovertebral angle tenderness is highly characteristic of acute uncomplicated cystitis. According to antibiotic stewardship guidelines, uncomplicated cystitis should be treated with first-line agents such as oral nitrofurantoin, trimethoprim-sulfamethoxazole, or fosfomycin. These medications effectively eradicate common uropathogens like Escherichia coli while minimizing collateral damage to the patient's normal flora and reducing the risk of community-wide antibiotic resistance.

Adım Adım Çözüm

1
Analyze the clinical presentation.
The patient has dysuria, urinary frequency, and suprapubic tenderness, with a urinalysis positive for nitrites and leukocyte esterase.
These findings are classic for acute uncomplicated cystitis (lower urinary tract infection).
2
Assess for signs of complicated infection or upper urinary tract involvement.
There is no fever, chills, nausea, or costovertebral angle (CVA) tenderness.
The absence of these signs rules out pyelonephritis, meaning aggressive or intravenous therapy is not indicated.
3
Apply antibiotic stewardship principles to select the best empiric pharmacotherapy.
Select a narrow-spectrum agent with high urinary concentration, such as oral nitrofurantoin.
First-line agents (nitrofurantoin, trimethoprim-sulfamethoxazole, or fosfomycin) effectively treat the infection while minimizing the risk of developing broad-spectrum antimicrobial resistance.

Anahtar Kavram

Acute uncomplicated cystitis should be treated empirically with first-line, narrow-spectrum agents (e.g., oral nitrofurantoin, trimethoprim-sulfamethoxazole, or fosfomycin) to promote antibiotic stewardship and avoid the unnecessary use of broad-spectrum antibiotics like fluoroquinolones.
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