Recovery of corpus luteum function after prolonged deprivation from gonadotrophin stimulation.

Three women with hypogonadotrophic hypogonadism, all desiring pregnancy, participated in a prospective open study attempting to assess the ability of the human corpus luteum to recover after 7 days of deprivation from gonadotrophin stimulation. Follicular growth was induced by gonadotrophins. An endogenous luteinizing hormone (LH) surge was induced by the s.c. injection of a gonadotrophin-releasing hormone agonist. For luteal support, 10 mg/day oral medroxyprogesterone acetate were given for 7 days, after which a single i.m. injection of human chorionic gonadotrophin (HCG) was administered. Monitoring during the follicular phase consisted of daily measurements of serum oestradiol, LH and follicle stimulating hormone (FSH) concentrations, and of follicular growth by transvaginal ultrasonography. During the luteal phase, monitoring consisted of measurements of serum concentrations of LH, FSH, oestradiol, progesterone, 17-hydroxyprogesterone and beta-HCG. Ovulation and luteinization occurred in two patients, demonstrated by transient marked increases in serum progesterone and 17-hydroxyprogesterone concentrations which decreased to basal preovulatory values and increased again following the administration of HCG 7 days later. In the third patient, ovulation and luteinization did not occur, and the subsequent administration of HCG did not result in an increase in progesterone concentration. Of the two patients who ovulated, one conceived and the second had a luteal phase of 15 days duration. Our preliminary results suggest that the human corpus luteum can be 'rescued' and can function normally after 7 days of deprivation from gonadotrophin stimulation in patients with hypogonadotrophic hypogonadism.