Risk factors and prognostic variables in the ovarian hyperstimulation syndrome.

This study was undertaken to clarify discriminative roles of multiple epidemiologic, hormonal, and biophysical variables for causation of ovarian hyperstimulation syndrome. Three hundred ninety-six patients with anovulatory infertility had ovulation induction with human menopausal gonadotropin throughout 1822 treatment cycles; 54 cycles (3%) were complicated by ovarian hyperstimulation syndrome. Early follicular serum estradiol and prolactin levels were higher in this group than in controls: 75.5 versus 46.2 pg/ml and 18.5 versus 11.7 ng/ml, respectively (p less than 0.01). On the day of human chorionic gonadotropin administration (day 0) the mean serum estradiol level was 1047 +/- 381 in the group with ovarian hyperstimulation syndrome and 719 +/- 339 pg/ml in controls (p less than 0.0001). In all follicular sizes and in all grades of ovarian hyperstimulation syndrome there was a tendency for more recruited follicles, with significantly more small follicles (12 to 14 mm) present on day 0 in all grades of ovarian hyperstimulation syndrome than in controls. Stepwise logistic regression performed on 22 variables identified a high-risk group for this syndrome; the major features are illustrated by young, lean patients who, after relatively few ampules of human menopausal gonadotropin, develop high estradiol levels and multiple small follicles.