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The present study was designed to assess the usefulness of the simplified ultralong protocol of gonadotrophin-releasing hormone agonist (GnRHa) for ovulation induction with intrauterine insemination (IUI) in patients with various stages of endometriosis. A prospective randomized trial was set up to compare the simplified ultralong protocol (ULP) and the long protocol (LP) of GnRHa for ovulation induction with IUI in patients with endometriosis. There was no evidence of other factors in infertility in any patient. In the ULP group (39 patients), 4 weeks after a single injection of 3.75 mg Decapeptyl had been given, daily s.c. administration of 0.1 mg Decapeptyl was initiated and continued for at least 2 weeks prior to ovarian stimulation. In the LP group (41 patients), daily s.c. administration of 0.1 mg Decapeptyl was initiated from the mid-luteal phase of the cycle preceding the stimulation cycle. After 14 days of administration, ovarian stimulation was started if pituitary desensitization had been achieved. The amount of gonadotrophins required, number of days of gonadotrophin administration, serum oestradiol response, and the number of mature follicles were comparable in both groups. The clinical pregnancy rate per cycle was significantly higher in the ULP group at 48.7% (19/39) compared with 26.8% (11/41) in the LP group. The miscarriage rates were 21.1% (4/19) in the ULP group and 18.2% (2/11) in the LP group. In patients with stage I or II endometriosis, there was no significant difference between the two groups with respect to clinical pregnancy rate per cycle (47.4 versus 35.0%). In patients with stage III or IV endometriosis, the clinical pregnancy rate per cycle was significantly higher in the ULP group at 50.0% (10/20) compared with 19.0% (4/21) in the LP group. This study suggests that a simplified ULP of GnRHa could give better chances of achieving pregnancy in endometriosis patients undergoing assisted reproductive technologies and that this protocol may be more useful in patients with an advanced stage of endometriosis.

human reproduction

Simplified ultralong protocol of gonadotrophin-releasing hormone agonist for ovulation induction with intrauterine insemination in patients with endometriosis