Attempts to stimulate multiple follicular growth for IVF by administration of pulsatile LHRH.

Administration of pulsatile LHRH (14.4 microgram/pulse per 90 min) from day 5 to 9, or day 7 to 11 of the cycle following clomiphene pretreatment on days 2-6 induced multiple follicular growth for oocyte recovery for in vitro fertilisation. Administration of LHRH without clomiphene pretreatment failed to induce multiple follicular development. The same group of patients treated with clomiphene alone had fewer numbers of mature follicles, fewer oocytes recovered and less pre-embryos for transfer than when treated with clomiphene and LHRH in combination. Peak gonadotrophin release following commencement of LHRH was seen within the first 24 h of administration with a gradual fall in both LH and FSH toward baseline pretreatment values by the fourth day of administration. A discernible LH increment to LHRH was still present on the fourth day of LHRH treatment, but in many individuals no FSH increment was observed. The preovulatory oocytes recovered were predominantly mature with fertilisation rates of 70% and 85.7% for the two regimens. No pregnancy occurred in the six patients who underwent pre-embryo transfer.