Comparison of position-related changes on uroflowmetric parameters in healthy young men

Objective: to determine the mean difference in maximum urine flow rate and post-void residual urine volume in sitting as well as standing voiding position in healthy males. methods: this descriptive,cross-sectional study was conducted at the department of urology,indus hospital,karachi,from october 2013 to march 2014,and comprised healthy volunteers enrolled using non-probability,consecutive sampling technique. each volunteer was asked to perform uroflowmetry in sitting and standing positions on two separate days,and a post-void residual volume was assessed after each test. the values of maximum flow rate,average flow rate,voiding volume,and post-void residue were compared between the different voiding positions. results: a total of 50 volunteers were inducted. in standing position the maximum flow rate was 32.4±9.6 ml/sec,average flow rate 8.8±16.9 ml/sec,and post-void residue was 8.8±16.9ml. similarly,in sitting position,the maximum flow rate was 14.8±5.4 ml/sec,average flow rate 14.8±5.4 ml/sec,and post-void residue was 6.6±9.4ml. a significant difference in both voiding positions was observed regarding the maximum flow rate,and average flow rate (p=0.001; p=0.003). however,the difference was not significant for voided volume (p=0.676),or post-void residual volume (p=0.771) in either position. age-wise stratification of data showed significant difference in both younger and older age groups in terms of maximum flow rate (p=00.19). however,the average flow rate was only significantly different in younger age group (p=0.00). there was no difference in voided volume or post-void residue in either age group (p>0.05). conclusion: the standing voiding position in healthy people influenced uroflowmetry findings,and was associated with higher flow rates. © 2017,pakistan medical association. all rights reserved.