GNRH1 and ovarian hyperstimulation syndrome: However, a GnRH agonist trigger showed benefit in terms of significantly increase number of metaphase II (METAPHASE II) oocytes (11.9 ± 6.6 versus 7.4 ± 4.9, p<0.001), increased mean maturation rate (77.3 ± 21.1% vs 68.5 ± 23.3%, p=0.049), and increased mean fertilization rate (84.1 ± 11.1% vs 74.0 ± 24.9%, p=0.027) with an increased number of 2PN embryos (9.3 ± 5.7 vs 6.3 ± 4.6, p=0.008), and significant decrease in development of mild/moderate OHSS (3.7% vs 21.3%, p=0.047).