A randomized prospective study of early follicular or midluteal initiation of long protocol gonadotropin-releasing hormone in an in vitro fertilization program.

OBJECTIVE

To determine the optimum menstrual cycle time to initiate a long-protocol gonadotropin-releasing hormone agonist (GnRH-a) down-regulation regimen before hMG stimulation before IVF.

DESIGN

Randomized, prospective, single, first cycle study.

SETTING

University teaching hospital.

PATIENTS

Eighty-six infertile couples undergoing IVF-ET attempt under rules for Ireland.

INTERVENTION

Gonadotropin-releasing hormone agonist administered intranasally from day 1 or 21 of menstrual cycle. Human menopausal gonadotropin commenced when pituitary down-regulation was confirmed.

MAIN OUTCOME MEASURES

Ovarian response, cancellation, fertilization, and pregnancy rates.

RESULTS

No significant differences found between day 1 and day 21 initiation. But starting on day 1 is more easily recognizable by patients and avoids the possibility of administering GnRH-a in the presence of an unsuspected pregnancy.

CONCLUSIONS

Both follicular and luteal phase initiation of GnRH-a long-protocol down-regulation are equally efficacious. In our clinical context, patients and management favor commencing on day 1.