title: [Are there any advantages in immediate assisted fertilization compared with differed fertilization?].
abstract: OBJECTIVE
  To demonstrate a difference between the two assisted fertilization procedures. Can either of these procedures be preferred on the basis of preoperative parameters or criteria? A protocol was created to facilitate the patient's decision, as the results of IAF are better that those of DAF.
  
  
  METHODS
  We have performed 39 in vitro fertilizations after testicular or epididymal sperm extraction since December 1995. We performed deferred assisted fertilization (DAF) in 19 patients with normal hormone assessment and normal testicular volume or after vasectomy and immediate assisted fertilization (IAF) for 20 patients with an abnormal assessment.
  
  
  RESULTS
  The two groups, IAF and DAF, were homogeneous and did not present any differences in terms of age, aetiology of sterility, risk factors or preoperative hormonal parameters. Direct examination of sperm samples, the site of sampling and histological examination did not demonstrate any significant difference between the two groups. ICSI (IntraCytoplasmic Sperm Injection) was performed for 16 couples by IAF and for 14 couples by DAF. We obtained 6 pregnancies (37.5%) in the IAF group and 2 pregnancies (14.3%) in the DAF group. The two groups were identical in terms of the number of oocytes taken and embryos transferred.
  
  
  CONCLUSIONS
  No significant difference was observed between the immediate and deferred fertilization techniques in terms of predictive factors, histology and quality of the direct examination, but the pregnancy rate was higher for IAF. We therefore think that this method should be preferred as the first-line procedure.
authors.affiliation: Service d'Urologie, C.H.U. d'Ulm, Allemagne.
authors.forename: S H
authors.initials: SH
authors.lastname: Maier
authors.forename: E
authors.initials: E
authors.lastname: Strehler
authors.forename: K
authors.initials: K
authors.lastname: Sterzik
authors.forename: R E
authors.initials: RE
authors.lastname: Hautmann
mesh_terms: D000328:Adult; D005260:Female; D005307:Fertilization in Vitro / Q000379:methods*; D006801:Humans; D007248:Infertility, Male / Q000628:therapy*; D008297:Male; D008875:Middle Aged; D011247:Pregnancy / Q000706:statistics & numerical data; D013997:Time Factors