The effect of standing and sitting voiding position on uroflowmetric findings and postvoiding residual volume in men with Benign Prostatic Hyperplasia (BPH)

Abstract

Background: Some studies proposed that different voiding position can affect voiding quality in men with benign prostatic hyperplasia (BPH). It is said that a particular voiding position can provide better uroflowmetric findings and less post-void residual volume (PVR) in men with BPH. This study aimed to analyze the effect of the two most common voiding positions (standing and sitting) on uroflowmetric findings and PVR in men with BPH to make a recommended voiding position for men with BPH.Methods: In this cross-sectional study, 36 men with symptomatic BPH were enrolled. The uroflowmetric study was done for each subject in 2 positions: standing and sitting. The following uroflowmetric parameters were studied: maximum flow rate (Qmax), time to maximum flow, average flow rate (Qave), and voiding time. PVR was assessed after each test. Data were analyzed by SPSS version 23 for Windows.Results: The mean Qmax was significantly better in sitting than a standing position (11.106±4.7801 mL/s vs. 9.536±5.3374 mL/s; p=0.018); the mean Qave, time to maximum flow, and PVR were not different between 2 positions. The mean for Qave for standing and sitting positions were 5.014±2.9888 mL/s and 5.508±2.4437 mL/s in, (p=0.058), the mean voiding time were 43.08±7.980 seconds and 40.22±9.897 seconds, respectively (p= 0.31), and the meantime to maximum flow was 12.39±7.454 seconds and 10.06±4.610 seconds, respectively (p=0.192). In contrast, mean PVR was 87.28±44.810 mL and 72.53±42.779 mL, respectively (p=0.091).Conclusion: The result of this study showed that sitting position had better Qmax than standing position. Incorporating a sitting position with other BPH management might give a synergistic effect that improves urinary flow in men with BPH.