title: [Morphology in intracytoplasmic sperm injection].
abstract: OBJECTIVE
  Was to determine if severe morphological defects of spermatozoa in Oligo-Astheno-Teratozoospermia (OAT) have any impact on the fertilization process in intracytoplasmic sperm injection (ICSI) and, if there are any specific morphological characteristics of unfertilized oocytes after the ICSI procedure.
  
  
  METHODS
  Ejaculates of males with severe subfertility and unfertilized oocytes after the ICSI procedure were investigated by transmissionelectronmicroscopy.
  
  
  RESULTS
  ICSI provided a fertilization rate of 66% in cases of severe defective spermatozoa. The ultrastructure revealed severe head and neck alterations in particular. The ultrastructure of the unfertilized oocyte displayed mostly no signs of activation and lack of decondensation of sperm chromatin.
  
  
  CONCLUSIONS
  Our findings support the hypothesis that not severe sperm defects but the lack of intracytoplasmic sperm-oocyte interaction displays the most critical role in the fertilization process in intracytoplasmic sperm injection.
authors.affiliation: Universitäts-Frauenklinik, Medizinischen Universität Lübeck.
authors.forename: W
authors.initials: W
authors.lastname: Küpker
authors.forename: S
authors.initials: S
authors.lastname: al-Hasani
authors.forename: W
authors.initials: W
authors.lastname: Schulze
authors.forename: W
authors.initials: W
authors.lastname: Kühnel
authors.forename: T
authors.initials: T
authors.lastname: Schill
authors.forename: R
authors.initials: R
authors.lastname: Felberbaum
authors.forename: K
authors.initials: K
authors.lastname: Diedrich
mesh_terms: D005260:Female; D005307:Fertilization in Vitro / Q000379:methods*; D006801:Humans; D007231:Infant, Newborn; D007248:Infertility, Male / Q000473:pathology / Q000628:therapy*; D007267:Injections; D008297:Male; D008854:Microscopy, Electron; D010063:Ovum / Q000473:pathology; D011247:Pregnancy; D011379:Prognosis; D013084:Sperm-Ovum Interactions / Q000502:physiology*; D013094:Spermatozoa / Q000002:abnormalities* / Q000473:pathology / Q000637:transplantation; D016896:Treatment Outcome
vernacular_title: Morphologie bei der intrazytoplasmatischen Spermieninjektion.