“…It is thought that norm:il ovarian function provides a protective effect, possihly :iccounting for the increased rates o f cardiovascular disease in women after menopause (Kercsztes bi Dm, 1992;I.oho, 1990). Studies have shown that exogenous estrogen tilay decrease the risk of cardiovascular diseasc hy as niuch as one half (Hazzard, 1989;Henderson, I?iganini-Hill, & Ross, 1991; Nabulsi et a]., 1093; Stai1ipfc.r c't id., 1991 ). One proposed protective mechanism is the fnvocihle iiiipact of circulating estrogen on serum lipid lcvels , 1991).…”