Comparison of GnRH antagonist and GnRH agonist used in IVF-ET in patients with PCOS

AIM:To compare the effect of the GnRH antagonist and GnRH agonist on the outcomes of polycystic ovary syndrome patients who underwent invitrofertilization and embryo transfer.METHODS:The study started from July 2012to December 2012.A total of 122patients with PCOS were divided into two groups according to the will of patients:54cycles in group A underwent GnRH antagonist protocol and 68cycles in group B underwent routine GnRH agonist protocol.The dosage of gonadotropin,hormone levels,laboratory results,OHSS incidence and clinical outcomes were compared between the two groups.RESULTS:Total dosage and duration of gonadotropin of group A were(1 342.82±442.56)IU and(9.67±2.06)d,which was significantly lower than that of group B(1 521.32±506.59)IU and(12.01±3.62)days.E2on the day of HCG administration of Group A(12 354.43±5 771.43)pmol/L was significantly higher than that of group B(8 685.26±4 218.03)pmol/L.The fertilization rate and blastocyst formation rate of group A(79.3% and 73.76%)were significantly higher compared with group B(39.33%and 30.71%).The clinical pregnancy rates were 44.90% and66.67%respectively.Group B had a rising trend but there had no significant difference.The other laboratory results,OHSS incidence and clinical outcomes were not significant difference.CONCLUSION:Compared with GnRH agonist protocol,GnRH antagonist protocol effectively reduced the amount and duration of gonadotriopin,cut down the costs and relieved the psychological burden.In addition,GnRH antagonist protocol improved the blastocyst formation rate,which may indirectly increased the cumulative pregnancy rate.We concluded that GnRH antagonist protocol may be an alternative method for PCOS patients.