Lower Maximum Watt Factor does not Associate Postoperatively with Lower Maximum Urinary Flow Rate

Objective: Collect preoperative and postoperative urodynamic parameters and clinical data from patients with benign prostatic hyperplasia (BPH), compare changes in urodynamic parameters before and after transurethral resection of the prostate (TURP), and explore the predictive value of the maximum Watt factor (WFmax) for postoperative parameters, aiming to provide a basis for clinical decision-making. Methods: Clinical data and pre- and postoperative urodynamic parameters were reviewed from patients with BPH underwent TURP in the department of urology at Shaoyang Central Hospital and The Second Affiliated Hospital of Guilin Medical University between June 2019 and June 2024. All patients underwent preoperative sonography videourodynamic studies (SVUDS), and maximum Watt factor (WFmax) and maximum urinary flow rate (Qmax) were reviewed. Recruited patients were stratified into two groups: group A, in which WFmax＞7w/m2, and group B, in which WFmax ≤ 7w/m2. Pre- and postoperative Qmax were compared between two groups. Results: 90 patients were enrolled into this study, WFmax＞7w/m2 were found in 54 (60%) patients and recruited into the group of normal detrusor contractility (group A), and the remining 36 (40%) patients, in which WFmax ≤ 7w/m2, were considered to have a impaired detrusor contractility (group B). All patients had a markedly improvement of Qmax, increased from 5.0 (2.7,6.6) to 13.9(10.0, 18.0) ml/s (p＜0.01), after TURP. Nevertheless, no significant difference of postoperative Qmax was found between patients with impaired (14.9±6.8ml/s) and normal (15.5±7.3ml/s) detrusor contractility (P=0.052), even though patients with impaired detrusor had a lower preoperative Qmax (4.7±2.1ml/s) compared to normal detrusor (5.5±2.3ml/s) (P=0,045). Conclusion: All patients underwent BPH showed a significant improvement of Qmax after TURP regardless of preoperative detrusor contractility. Lower preoperative WFmax was not associated with lower postoperative Qmax even though