A prospective study of time and number of ejaculations to XXXX after vasectomy by ligation and excision.

@entity1 @entity3893
PURPOSE: We obtained detailed information on the time and number of ejaculations to @entity3893 after vasectomy by ligation and excision. MATERIALS AND METHODS: @entity1 seeking vasectomy at 3 public clinics in Mexico City were invited to participate in this prospective noncomparative study. Vasectomy was performed using the no-scalpel technique. The vas was occluded using 2 silk sutures and the segment of vas between the ligatures was excised. @entity1 were followed biweekly up to 24 weeks after vasectomy or until @entity3893 was confirmed. Semen was examined at each visit for sperm concentration and motility. The main outcome measure was @entity3893 in uncentrifuged semen samples. RESULTS: The life table rate for time to @entity3893 was 81.5/100 @entity1 (95% CI 76.2 to 86.9) by the end of the study. Cumulative Kaplan-Meier event probability attained a maximum of 79.5/100 @entity1 (95% CI 73.7 to 85.2) at 70 ejaculations. Only 60/100 and 27.9/100 @entity1 were azoospermic by 12 weeks and 20 ejaculations, respectively. These end points are the commonly recommended waiting periods when semen analysis is unavailable. Of the 217 @entity1 36 (16.6%) did not achieve @entity3893 by 24 weeks, of whom 25 (11.5% of all @entity1 ) were considered to have vasectomy failure. CONCLUSIONS: Our results suggest that it is not possible to develop guidelines for clearance based only on the time or number of ejaculations when ligation and excision are performed. In addition, of the methods for vas occlusion during vasectomy ligation and excision may not provide the best success rates.
