title: Sterile water irrigation of the distal vas deferens at vasectomy: does it accelerate clearance of sperm? A prospective randomized trial.
abstract: OBJECTIVE
  To assess the effect of irrigation of the distal vas deferens with sterile water at the time of vasectomy on sperm clearance. Is it possible to accelerate clearance and avoid the problem of lingering sperm?
  
  
  METHODS
  Two hundred men undergoing vasectomy were randomized to receive either a standard vasectomy or vasectomy plus irrigation of each vas deferens with sterile water. The interval between vasectomy and the production of two azoospermic semen samples was recorded.
  
  
  RESULTS
  Overall, 37 patients were excluded for failing to follow the postvasectomy protocol for semen analysis, leaving 87 in the control group and 76 who received vasal irrigation. No statistically significant differences existed between the two groups with regard to the mean time to clearance (26.4 weeks, control group versus 28.6 weeks, flush group), proportion clear at 16 weeks (29% versus 21%), or proportion with lingering sperm at 40 weeks (22% versus 26%).
  
  
  CONCLUSIONS
  Irrigation of the vas deferens with sterile water does not accelerate the clearance of spermatozoa after vasectomy. Men wishing to undergo vasectomy must be counseled about the possibility of lingering sperm.
authors.affiliation: Department of Urology, Aberdeen Royal Infirmary, Aberdeen, United Kingdom.
authors.forename: Robert G
authors.initials: RG
authors.lastname: Mason
authors.forename: Lachlan
authors.initials: L
authors.lastname: Dodds
authors.forename: Satchi K
authors.initials: SK
authors.lastname: Swami
mesh_terms: D000328:Adult; D006801:Humans; D008297:Male; D008875:Middle Aged; D009845:Oligospermia; D011446:Prospective Studies; D012661:Semen / Q000166:cytology; D013076:Sperm Count; D007507:Therapeutic Irrigation / Q000379:methods*; D014649:Vas Deferens; D014659:Vasectomy / Q000379:methods*