GNRH1 and ovarian hyperstimulation syndrome: It is likely that the exceptionally high rate of OHSS among IVF patients triggered with a GnRH agonist trigger in the study by Elgindy et al. (16) stems from the addition of hCG on the day of OPU as well as from the fact that all these patients underwent embryo transfer and therefore fetal hCG may have contributed to the higher rates of late OHSS.