Stewardship Intervention for Asymptomatic Bacteriuria
A 72-year-old woman is admitted to the hospital for a hip fracture. On admission, a urine culture is obtained because she had cloudy urine, and it grows >100,000 CFU/mL of Escherichia coli susceptible to most antibiotics. She has no fever, dysuria, frequency, or suprapubic pain. Her baseline mental status is normal. The admitting team plans to start ciprofloxacin. The hospital's antimicrobial stewardship program is reviewing all positive urine cultures.
1. Should the patient receive antibiotics for this positive urine culture? Explain your reasoning.
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No, the patient has asymptomatic bacteriuria (ASB). ASB is common in older adults and does not require treatment except in specific situations: pregnancy, prior to urologic procedures with mucosal trauma, or in patients with neutropenia. This patient has no urinary symptoms and no systemic signs of infection. Cloudy urine alone is not an indication. Treatment of ASB can lead to adverse effects, including C. difficile infection, antimicrobial resistance, and unnecessary costs. The stewardship program should recommend against antibiotics and document the rationale. If the patient develops symptoms, then treat.
2. What if the patient were to undergo a transurethral resection of the prostate (TURP) in 2 days? Would your approach change?
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If the patient were to undergo a urologic procedure with mucosal trauma (e.g., TURP), antibiotic prophylaxis is recommended to prevent bacteremia and sepsis. For ASB, a short course of targeted antibiotics based on susceptibility is indicated. In this case, ciprofloxacin would be appropriate if susceptible, but consider local resistance. Typically, a single dose or short course (e.g., ciprofloxacin 500 mg orally 1 hour before procedure) is sufficient. However, the patient is female, so TURP is not applicable; but if it were a similar procedure, the approach would be to treat ASB before the procedure. The question says 'if the patient were to undergo TURP' despite being female, it's hypothetical. So yes, I would treat with a short course of antibiotics prior to the procedure.