Short coasting of 1 or 2 days by withholding both gonadotropins and gonadotropin-releasing hormone agonist prevents ovarian hyperstimulation syndrome without compromising the outcome.

OBJECTIVE: To evaluate the effect of short coasting, by withdrawing both gonadotropins and gonadotropin-releasing hormone (GnRH) agonist, on the prevention of severe ovarian hyperstimulation syndrome (OHSS) without compromising pregnancy outcome.
DESIGN: Retrospective study.
SETTING: Large urban medical center. PATIENT(S): Forty-four women who had been coasted during controlled ovarian hyperstimulation (COH) for in vitro fertilization (IVF). INTERVENTION(S): When >or=20 follicles >15 mm with serum estradiol (E(2)) level of 4000 pg/mL were detected, both gonadotropins and GnRH agonist were withheld for 1 to 2 days. MAIN OUTCOME MEASURE(S): Changes of serum E(2) levels, number of oocytes retrieved, pregnancy rate. RESULT(S): The mean serum E(2) level fell from 7915 pg/mL at the onset of coasting to 3908 pg/mL on the day of human chorionic gonadotropin (hCG) administration. The mean number of oocytes retrieved and fertilization rate were 17.2% and 75.0%, respectively. Eighteen patients became pregnant (43.9%), and the implantation rate was 12.7%. Twenty-eight patients were coasted for 1 day, and 13 were coasted for 2 days. The mean decrease rate of serum E(2) level was 45.3% in 1-day coasting and 26.4% (first day) and 75.3% (second day) in 2-day coasting. The pregnancy outcome was similar between both groups. After coasting, three mild and two severe cases of OHSS occurred. CONCLUSION(S): Coasting for 1 or 2 days can be used successfully to prevent OHSS without compromising IVF cycle outcome.