Clinical and Metabolic Responses of Menopausal Women to Sequential Versus Continuous Estrogen and Progestin Replacement Therapy

To minimize the cyclic menstrual bleeding associated with the sequential administration of estrogen and progestin in menopausal women, medroxyprogesterone acetate at the daily dose of 10 mg orally was administered, either sequentially for ten days of each 25-day treatment cycle or continuously with conjugated equine estrogen for three months. Cyclic menstrual bleeding occurred in all ten patients on sequential therapy; their endometrial histology was secretory in six, proliferative in two, and adenomatous hyperplasia in one. Of the ten patients on continuous therapy, four were amenorrheic and six experienced acyclic bleeding, but the endometrial histology was atrophic or inactive in all ten. The continuous treatment group experienced a statistically significant decrease in the mean serum levels of total cholesterol, whereas the serum levels of both low- and high-density cholesterol fractions decreased slightly. However, the sequential group experienced no change in serum levels of total cholesterol, a slight rise in high-density lipoprotein, and a significant decrease in low-density lipoprotein cholesterol fractions. Our data suggest that the combined and continuous use of conjugated equine estrogen and medroxyprogesterone acetate effectively relieves menopausal symptoms, decreases the frequency of uterine bleeding, induces endometrial atrophy, and significantly decreases serum levels of total cholesterol.