title: Preoperative factors influencing postoperative results after vasovasostomy.
abstract: OBJECTIVE
  The purpose of this study is to evaluate the preoperative factors that influenced postoperative sperm concentration after vasovasostomy.
  
  
  METHODS
  We retrospectively reviewed 97 consecutive single-layer vasovasostomy procedures performed by a single surgeon between March 2003 and September 2010. The patients were stratified into three groups based on sperm concentration at 1 month follow-up: group I-azoospermia, group II-oligospermia, and group III-normal. We evaluated the preoperative factors that may have influenced sperm concentration at postoperative 1 month. Patients with serial semen analysis were divided into four groups according to the change in postoperative sperm concentration at the 6-month visit: group II-N-from oligospermia to normal, group II-O-from oligospermia to oligospermia, group III-O-from normal to oligospermia, group III-N-from normal to normal. We compared the pregnancy rate among the four groups.
  
  
  RESULTS
  The mean obstructive interval was 9.69 years in group I, 6.02 years in group II, and 7.82 years in group III. There were significant differences found among the groups (p=0.035). There was significantly different change in sperm concentration, sperm motility, and sperm morphology between each of the groups. A total of 32 patients underwent serial semen analyses at 1 month, 3 months, and 6 months after vasovasostomy. There was no significant difference in patient age, obstructive interval, or follicle-stimulating hormone among the groups. The natural pregnancy rate in group II-O was lower than that in group II-N, and in group III-O was lower than that in group III-N. However, there was no significant difference among each of the groups.
  
  
  CONCLUSIONS
  The sperm concentration after vasovasostomy was significantly related to the obstructive interval between vasectomy and reversal.
authors.affiliation: Department of Urology, Chonbuk National University Medical School, Jeonju, Korea. ; Institute for Medical Sciences, Chonbuk National University, Jeonju, Korea. ; Biomedical Research Institute and Clinical Trial Center of Medical Device, Chonbuk National University Hospital, Jeonju, Korea.
authors.forename: Yu Seob
authors.initials: YS
authors.lastname: Shin
authors.forename: Sang Deuk
authors.initials: SD
authors.lastname: Kim
authors.forename: Jong Kwan
authors.initials: JK
authors.lastname: Park
keywords: Factor; Sperm count; Vasovasostomy