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A reduced time interval of oocyte exposure to spermatozoa was investigated to assess whether it could enhance oocyte development and improve embryo viability, especially in cases of male factor infertility. A total of 167 patients were included in a prospective randomized study. They were randomly allocated to two major study groups, A (n = 85) and B (control group; n = 82). The oocytes from group A patients were exposed to spermatozoa for only 1 h; those from group B were exposed for 16 h. The two study groups were then subdivided according to semen quality for further analysis of the results. Significantly higher percentages were obtained in group A than in group B in terms of the fertilization rate (74 versus 68%, P &lt; 0.025), cleavage rate (53 versus 41%, P &lt; 0.005), pregnancy rate (27 versus 12%, P &lt; 0.05) and implantation rate (11 versus 6%, P &lt; 0.05). In addition, an increased fertilization rate was achieved in oocytes exposed to male factor spermatozoa for only 1 h compared with the conventional incubation period (78 versus 65%, P &lt; 0.01). Advanced cellular stages (55 versus 41%, P &lt; 0.02) and higher implantation rates (13 versus 4%, P &lt; 0.05) were attained in the subgroup whose oocytes were exposed to normal spermatozoa for 1 h compared with the male factor spermatozoa with the standard culture interval. The higher fertilization rates, enhanced embryo development and viability achieved in group A indicate that prolonged exposure of oocytes to high concentrations of spermatozoa is detrimental, decreasing sperm-oocyte interaction and subsequent embryo implantation, particularly in male factor patients.

Fertilization and early embryology: Prolonged sperm-oocyte exposure and high sperm concentration affect human embryo viability and pregnancy rate