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Difficulty: EasyInfectious Diseases

A 24-year-old woman presents to the outpatient clinic with a 2-day history of painful urination and increased urinary frequency. She reports no fever, chills, nausea, vomiting, vaginal discharge, or back pain. She is otherwise healthy, has no known drug allergies, and takes no medications. Vital signs are within normal limits. Physical examination reveals mild suprapubic tenderness but is negative for costovertebral angle tenderness. A urine dipstick test is positive for leukocyte esterase and nitrites. Which of the following is the most appropriate empiric pharmacotherapy for this patient?

  1. NitrofurantoinAnswer
  2. B
    Ciprofloxacin
  3. C
    Ceftriaxone
  4. D
    Amoxicillin
  5. E
    Azithromycin

Answer

Nitrofurantoin
The patient presents with classic symptoms and signs of uncomplicated acute cystitis (dysuria, frequency, suprapubic tenderness) without systemic involvement. Current guidelines recommend nitrofurantoin, trimethoprim-sulfamethoxazole, or fosfomycin as first-line empiric agents. Nitrofurantoin is highly concentrated in the urine, highly effective against typical uropathogens like Escherichia coli, and has a low impact on normal gastrointestinal flora, making it an excellent choice for antimicrobial stewardship.

Step-by-Step Solution

1
Analyze the patient's symptoms and examination findings.
The patient has dysuria, urinary frequency, and suprapubic pain without systemic signs (no fever) or upper urinary tract signs (no costovertebral angle tenderness).
To differentiate between uncomplicated cystitis and complicated infections like pyelonephritis.
2
Interpret the laboratory findings.
Positive leukocyte esterase and nitrites on urine dipstick strongly support a bacterial urinary tract infection.
To confirm the clinical suspicion of a bacterial etiology.
3
Select the most appropriate empiric treatment based on current guidelines.
Nitrofurantoin is chosen as a first-line oral agent for uncomplicated cystitis.
It provides targeted therapy for common uropathogens with a low risk of collateral damage and resistance compared to broad-spectrum options.

Key Concept

The first-line empiric treatments for uncomplicated acute cystitis in women include nitrofurantoin, trimethoprim-sulfamethoxazole, and fosfomycin, avoiding broad-spectrum agents to practice good antimicrobial stewardship.
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Infectious Diseases

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