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Comparison between clomiphene plus pulsatile human menopausal gonadotrophin and clomiphene plus pulsatile follicle stimulating hormone in induction of multiple follicular development in women.

Eighteen normally cycling women with tubal infertility undergoing in-vitro fertilization and embryo transfer were treated with clomiphene only (nine cycles), clomiphene plus human menopausal gonadotrophin (HMG) (18 cycles) and clomiphene plus follicle-stimulating hormone (FSH) (12 cycles). Clomiphene was given from day 2 to 6 (150 mg daily). HMG and FSH were injected s.c. in a pulsatile manner via a pump (28 IU every 3 h). Plasma FSH and oestradiol levels and the number of follicles greater than or equal to 16 mm in diameter were similar in the clomiphene/HMG and the clomiphene/FSH cycles, but significantly higher than in the clomiphene-only cycles. In contrast, luteinizing hormone and progesterone levels during the treatment did not differ significantly among the three regimens. Twelve of the 18 women were treated with clomiphene/HMG in one cycle and clomiphene/FSH in another and eight of them with clomiphene only in a third cycle (a total of 32 cycles). In the clomiphene/HMG cycle seven of these 12 women (58%) had plasma FSH levels during treatment similar to those in the clomiphene/FSH cycle and six of them (86%) had the same number of follicles in both cycles. A significant, but not very strong correlation was found between FSH treatment levels and the number of follicles greater than or equal to 16 mm when all 32 cycles were combined (r = 0.40). It is suggested that pulsatile HMG and FSH in combination with clomiphene are in general equally effective in inducing multiple follicular development in normal women. However, individual responses show great variability.