title: The incidence of polyspermy during in vitro fertilisation. A study at the H. F. Verwoerd Hospital, Pretoria.
abstract: Results from 1249 in vitro-fertilised human oocytes were analysed to identify the incidence of polyspermy. In this study polyspermy occurred in 23 oocytes (1.8%). The effects of the various ovulation induction protocols employed, maturation of oocytes, incubation time before insemination and anaesthesia exposure were examined in order to identify a cause for polyspermy. Early diagnosis of polyspermy is important because the polyspermic embryo may appear morphologically normal at a later stage but should not be transferred since this nearly always results in a spontaneous abortion.
authors: Department of Obstetrics and Gynacology, University of Pretoria.
authors: C B
authors: CB
authors: Sevenster
authors: J V
authors: JV
authors: van der Merwe
authors: C
authors: C
authors: van Zyl
mesh_terms: D005306:Fertilization; D005307:Fertilization in Vitro; D006801:Humans; D008297:Male; D013094:Spermatozoa