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[Antimicrobial prophylaxis in urethrocystoscopy. Comparative study].

Instrumentation of lower urinary tract is a predisposing factor for the development of urinary infection. Incidence of infective complications following urethrocystoscopy has been evaluated in a multicenter, prospective, comparative and randomized study in 2,284 patients, who had a previous negative urine culture. Patients were randomized into two groups: one to be used as control and the other one to received antimicrobial prophylaxis prior to instrumentation (ceftriazone, 1 gr intramuscular). Clinical and microbiological responses were evaluated at 48-72 hours and 4 weeks after cystoscopy. Symptomatic bacteriuria was observed in 10.2% of patients in the control group and in 2.5% in the prophylaxis group (p < 0.000); asymptomatic bacteriuria in 3.02% and 1.52% (p > 0.05) and irritative syndrome with sterile urine in 2.93% and 2.60% (p > 0.05), respectively. Thus, the use of prophylaxis reduced the incidence of infective complications in these patients.