title: Delayed fertilization during in vitro fertilization and embryo transfer cycles: analysis of causes and impact on overall results.
abstract: This study evaluated possible causes of delayed fertilization during in vitro fertilization (IVF) cycles, its repetitiveness, and its influence on IVF results in 23 patients (27 cycles) with delayed fertilization of greater than or equal to 1 preovulatory oocyte(s). In 15 cycles, reinsemination with husband's semen was performed at 18 hours. Possible causes of delayed fertilization were oocyte defects (10 cycles, 37.0%), sperm defects (4 cycles, 14.8%), oocyte and sperm defects (4 cycles, 14.8%), and no detectable gamete defects (9 cycles, 33.3%). Overall fertilization rate was 47.9%. No pregnancies were observed in 10 patients with one embryo transferred. Recurrence rate of delayed fertilization per patient was 17.3%; overall ongoing pregnancy rate/cycle was 10.3%. Although repetitiveness of delayed fertilization is low, it seems to impact negatively on IVF results.
authors.affiliation: Howard and Georgeanna Jones Institute for Reproductive Medicine, Department of Obstetrics and Gynecology, Eastern Virginia Medical School, Medical College of Hampton Roads, Norfolk 23507.
authors.forename: S
authors.initials: S
authors.lastname: Oehninger
authors.forename: A A
authors.initials: AA
authors.lastname: Acosta
authors.forename: L L
authors.initials: LL
authors.lastname: Veeck
authors.forename: S
authors.initials: S
authors.lastname: Simonetti
authors.forename: S J
authors.initials: SJ
authors.lastname: Muasher
mesh_terms: D004624:Embryo Transfer; D004958:Estradiol / Q000097:blood; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D008297:Male; D009865:Oocytes / Q000473:pathology; D013094:Spermatozoa / Q000002:abnormalities; D013997:Time Factors
chemical_list: D004958:Estradiol