Dual Trigger Versus GnRHa Trigger Combined With Luteal HCG Administration

Inclusion Criteria: * Women subjected to ICSI through controlled ovarian hyperstimulation (COH) with pituitary downregulation by GnRH antagonist. * Presence of risk for development of OHSS: 1) previous moderate or severe OHSS; 2) PCOS or polycystic ovary on ultrasound scan; 3) antral follicle count (AFC) \> 14 in both ovaries; 4) basal serum AMH level \> 3.36 ng/ml; 5) \> 14 follicles with diameter of ≥ 11 mm on the day of triggering of oocyte maturation; 6) E2 level \> 3000 pg/ml on the day of triggering of oocyte maturation. Exclusion Criteria: * Age \< 20 years or \> 35 years. * BMI \< 19 kg/m2 or \> 35 kg/m2. * Moderate or severe endometriosis. * Hydrosalpinx. * Uterine abnormalities or myoma. * Previous uterine surgery. * Use of alternative techniques to minimize the risk of OHSS.