{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,26]],"date-time":"2025-10-26T20:35:56Z","timestamp":1761510956302},"reference-count":16,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2011,9,26]],"date-time":"2011-09-26T00:00:00Z","timestamp":1316995200000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Neurourology and Urodynamics"],"published-print":{"date-parts":[[2012,1]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Introduction<\/jats:title><jats:p>The effect of urodynamic catheters on urine flow rate (Q<jats:sub>max<\/jats:sub>) is well documented but under\u2010researched. Several studies show reduced Q<jats:sub>max<\/jats:sub> but methodologies and patient demographics differ. The aims of this study were to further quantify the effect of urodynamic catheters on Q<jats:sub>max<\/jats:sub> and to explore if this was consistent across different urodynamic diagnoses.<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Four groups of 50 consecutive men attending for urodynamic studies (UDS) were retrospectively analyzed: Group 1 comprised 50 men with normal UDS, Group 2 was 50 men with BOO, and Group 3 contained 50 men with detrusor underactivity. Groups 1\u20133 had UDS performed using both 10\u2009Fr filling and 4\u2009Fr measuring catheters in situ. Group 4 comprised 50 men who had UDS performed with a smaller catheter assembly (8\u2009Fr dual\u2010lumen). Values of Q<jats:sub>max<\/jats:sub> with and without catheters present were compared using paired Student's <jats:italic>t<\/jats:italic>\u2010tests. Differences between groups were compared using ANOVA.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>Q<jats:sub>max<\/jats:sub> measured during UDS in men from Groups 1\u20133 showed a mean reduction of 38% compared to Q<jats:sub>max<\/jats:sub> from \u201cfree\u201d uroflowmetry. ANOVA indicated this reduction was significantly greater among men with normal UDS. Interestingly the group who underwent UDS with a smaller catheter assembly showed no significant reduction in Q<jats:sub>max<\/jats:sub> measured with catheters in situ.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Our findings are in line with previous work suggesting that smaller calibre urethral catheters do not cause a significant obstructive effect during voiding. In addition it would appear that the reduction in Q<jats:sub>max<\/jats:sub> with larger urethral catheters in situ is greatest in those with normal urodynamics. Neurourol. 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