Observation And Compare On The Urodynamics Between The Pre- And Post-operative Hypospadiac

Objective: To compare and observe the varieties of the urodynamics indexes between the pre- and post-operative hypospadiac, investigate the patency after operation, and make an objective evaluation of surgical options.Methods: The urodynamics indexes were measured in 52 cases of pre-and post-operative hypospadiac. The cases were classified by age and methods of operations. The differences of indexes between the pre-and post-operative hypospadiac were analyzed by t-test.Results: Before operation, the Qmax was lower in hypospadiac than normal. After operation, the Qmax was obviously decreased. There was statistical significance. In preoperative hypospadiac, bell-shaped curves were dominant. But after operation, plateau curves were markedly increased. In the comparison of different operations, the Duckeet urethroplasty had the max influence on the urinary flow curve and Qmax. The Snodgrass urethroplasty was the second. The Mathieu urethroplasty had the minimum influence on both. The Koyanagi urethroplasty also had less influence. The Onlay urethroplasty was intermediate. The bladder leak point pressure was obviously increased and the urethral functional length and maximum length of the urethra were longer in postoperative hypospadiac. There were no statistical significance in both the maximum urethral closure pressure and the maximum urethral pressure.Conclusions: Urodynamics can be as the indicator in evaluating the urinary function of the postoperative hypospadiac and the methods of operations. It is also the clue of the urethrostenosis.