Antibiotic treatment to prevent urinary tract infections after urodynamic evaluation.

The aim of the study was to determine the efficacy of cotrimoxazole administration after urodynamic testing to prevent urinary tract infections. In a single-blind prospective randomized study 94 women who attended for urodynamic evaluation were included. After multichannel urodynamic testing, including two catheterizations, the women received a single dose of cotrimoxazole or placebo. A clean-catch urine specimen was tested for infection after 1 week. Seventy women returned a urine specimen after 1 week: 2/37 (5.4%) in the treatment and 2/33 (6.1%) in the placebo group had acquired a new urinary tract infection after urodynamics. One major and one minor adverse reaction to cotrimoxazole were reported. The power of the sample size was unfortunately too small to draw conclusions as to the efficacy of prophylaxis.