title: Comparison of sperm parameters, in vitro fertilization results, and subsequent pregnancy rates using sequential ejaculates, collected two hours apart, from oligoasthenozoospermic men.
abstract: OBJECTIVE
  To evaluate the effect of second consecutive ejaculate collected 2 hours after the first one from infertile men on sperm quality and fertilization and pregnancy rates (PRs) in IVF.
  
  
  METHODS
  A prospective case-control study.
  
  
  METHODS
  In vitro fertilization unit of a university hospital.
  
  
  METHODS
  Thirty-nine consecutive infertile patients with oligoasthenozoospermia scheduled for IVF-ET.
  
  
  METHODS
  Two consecutive ejaculates were obtained 2 hours apart and were assessed for volume, sperm count, motility, morphology, and quality of swim-up fraction. The subsequent fertilization, cleavage, and PRs (as defined by the appearance of intrauterine gestational sac) were compared between the two ejaculates.
  
  
  RESULTS
  In 28.2% of the individuals the semen analysis of the first ejaculate precluded proceeding with IVF. A statistically significant improvement was shown in sperm cell motility (31.9% +/- 20.7% versus 15.6% +/- 15.3%) and in motile count after swim-up (4.9 +/- 4.5 versus 2.6 +/- 3.1 x 10(6) sperm). No improvement could be demonstrated in sperm density or morphology. The volume of the second ejaculate was decreased significantly as compared with the first one. The fertilization rate, the cleavage rate, and PR were all increased when oocytes were exposed to sperm from the second ejaculate compared with oocytes exposed to sperm from the first ejaculate. The overall PR in our series was 25.6%.
  
  
  CONCLUSIONS
  We suggest that in the group of infertile men with oligoasthenozoospermia, whose partners are scheduled for IVF-ET, if on the day of retrieved oocytes insemination, the ejaculate is of unacceptable quality, a second ejaculate collected 2 hours after collection of the initial ejaculate may produce a sample that exhibits improvements in both semen parameters and reproductive potential.
authors.affiliation: Department of Obstetrics and Gynecology, Kaplan Hospital (Affiliated with the Medical School of the Hebrew University and Hadassah, Jerusalem), Rehovot, Israel.
authors.forename: A
authors.initials: A
authors.lastname: Barash
authors.forename: S
authors.initials: S
authors.lastname: Lurie
authors.forename: A
authors.initials: A
authors.lastname: Weissman
authors.forename: V
authors.initials: V
authors.lastname: Insler
mesh_terms: D000328:Adult; D016022:Case-Control Studies; D004542:Ejaculation / Q000502:physiology*; D005260:Female; D005306:Fertilization / Q000502:physiology; D005307:Fertilization in Vitro / Q000592:standards*; D006801:Humans; D007248:Infertility, Male / Q000209:etiology / Q000503:physiopathology / Q000628:therapy; D008297:Male; D009845:Oligospermia / Q000150:complications / Q000503:physiopathology* / Q000628:therapy; D011247:Pregnancy; D011256:Pregnancy Outcome; D018873:Pregnancy Rate; D011446:Prospective Studies; D013076:Sperm Count; D013081:Sperm Motility / Q000502:physiology; D013084:Sperm-Ovum Interactions / Q000502:physiology; D013094:Spermatozoa / Q000502:physiology*; D013997:Time Factors