Effects of triploidy incidence on clinical outcomes for IVF-ET cycles in different ovarian stimulation protocols

Purpose: To discuss the relationship between triploidy incidence and clinical outcomes of embryos derived from normally fertilized oocytes from the same cohort for in vitro fertilization-embryo transfer (IVF-ET) cycles in different ovarian stimulation protocol.Methods: This study included 2070 in vitro fertilization (IVF) cycles with long-term protocol, 802 IVF cycles with ultra short-term protocol and 508 IVF-D (in vitro fertilization by donor semen) cycles with long-term protocol from January 2013 to September 2014. According to the different 3PN rate, patients were divided into three groups as follows: Group 1 included patients with 0% 3PN zygotes, Group 2 included patients with 1-25% 3PN zygotes and Group 3 included patients with >25% 3PN zygotes. Main outcome measure: female age, no. of retrieved oocytes, normal fertilization rate, day-3 grade I + II embryos rate, day-3 grade I + II + III embryos rate, implantation rate, pregnancy rate and early abortion rate.Results: Triploidy cycle incidence rate in IVF and IVF-D cycles with long-term protocol were significantly higher than in IVF cycles with ultra short-term protocol (p < 0.001). Triploidy fertilization rate found no significant difference between the three groups (p > 0.05). In three protocols, normal fertilization rate in 3PN = 0% and 3PN = 1-25% groups were significantly higher compared to 3PN > 25% group (p < 0.001). In IVF cycles with long-term protocol, the day-3 grade I + II embryos, implantation and pregnancy rate in 3PN > 25% group were significantly lower than other two groups (p < 0.05). The day-3 grade I + II + III embryos and early abortion rate found no significant difference between the three groups (p > 0.05). In IVF cycles with ultra short-term protocol, there were no significant differences found in day-3 grade I + II embryos, day-3 grade I + II + III embryos, implantation, pregnancy and early abortion rate (p > 0.05). In IVF-D cycles with long-term protocol, the day-3 grade I + II embryos, day-3 grade I + II + III embryos and implantation rate in 3PN > 25% group were significantly lower than other two groups (p < 0.05). The pregnancy and early abortion rates found no significant difference in the three groups (p > 0.05).Conclusion: We observed that high proportion of triploid zygotes made a negative effect on clinical outcomes for IVF-ET cycles with long-term protocol.