GNRH1 and ovarian hyperstimulation syndrome: We designed a prospective, randomized, double-blind, placebo controlled trial to explore any differences between two well established protocols, dual trigger with low dose hCG plus GnRH agonist versus low dose hCG administration 35 h after GnRH agonist trigger at the time of oocyte retrieval in women at risk of OHSS with peak serum E2 o < 4000 pg/mL.