A vented urinary drainage system was compared to an otherwise identical non-vented system in a prospective, randomized, double-blind study. Among the 316 female patients evaluated there was a significant reduction in the rate of bacteriuria after 10 days using the vented system (66 per cent in the non-vented group versus 26 per cent in the vented group, p less than 0.05), while no significant difference could be demonstrated among the 190 male patients. We used urine hemoglobin as an indicator of mucosal trauma that might predispose to bacteriuria and no significant difference could be shown between the 2 drainage systems.

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