GnRH agonist stop antagonist protocol versus GnRH antagonist protocol in ovarian poor responders undergoing IVF

Introduction and objective: Can the GnRH agonist STOPantagonist protocol versus the GnRH antagonist protocol be useful in improving IVF (In vitro fertilization) outcomes in patients with poor ovarian responses candidate for IVF? Methods: The present study was conducted as a single-blind clinical trial in the infertility ward of Arash Hospital of Tehran University of Medical Sciences. In this study, 133 patients with poor ovarian response (POR) according to Bologna criteria were randomly assigned two groups of GnRH agonist stop-antagonist protocol and GnRH antagonist protocol. The number of dominant follicles and number of oocytes retrieved, the number of embryos and their grade, level of antagonist used, level of gonadotropin used, length of days of stimulation and endometrial thickness, level of estrogen, level of progesterone, trigger day, and fertilization rate were measured. Results: In the present study, the frequency of dominant follicles in the GnRH agonist stop-antagonist group was significantly higher than that in the GnRH antagonist group (p-value = 0.01). The number of embryos in the GnRH agonist stop_antagonist group was significantly higher than that in the GnRH antagonist group (p-value = 0.02). The percentage of AB embryo agonists in the GnRH agonist stop_anta group was significantly higher than that in the GnRH antagonist group (p-value = 0.003). The number of mature oocytes in the GnRH agonist stop_antagonist group was more than that in the GnRH antagonist group, but the difference between the two groups was not statistically significant. The number of used gonadotropin doses in the GnRH agonist stop _antagonist group was significantly higher than that in the GnRH antagonist group (p-value = 0.01). The number of used antagonists in the GnRH antagonist group was significantly higher than that in the GnRH agonist stop_antagonist group (p-value = 0.02). Conclusion: The GnRH agonist stop-Anta protocol is a valuable tool for the treatment of poor ovarian responders. However, controlled prospective randomized studies with larger sample sizes are needed.