Half-Dose, Long-Acting Gonadotropin-Releasing Hormone Agonist (Diphereline) Is Comparable With Daily Injections Of Short-Acting Gonadotropin-Releasing Hormone Agonist (Suprefact) In Ivf/Icsi Cycles

Introduction: The aim of the study was to compare the efficacy of half-dose, long-acting GnRH analogue (Diphereline) with Suprefact in IVF/ICSI (in vitro fertilization/intracytoplasmic sperm injection) cycles.Material and methods: In this randomized clinical trial performed in Royan Institute, 126 infertile women who were first time candidates for IVF/ICSI were enrolled. Patients were randomly divided into two groups by using a random number table. In one group, 62 patients received a single half dose, 1.87 mg Diphereline, in mid-luteal phase. In the other group, 64 cases were treated with buserelin from the previous mid-luteal phase. P value less than 0.05 was considered significant.Results: The mean age of patients in the Diphereline and Suprefact groups was 27.9 +/- 3.6 and 29.6 +/- 3.5 years, respectively (p = 0.01). In the Diphereline group, the mean number of used gonadotropins was 25.6 +/- 12.1 ampoules, while in the second group it was 25.9 +/- 8.5 ampoules. Numbers of retrieved and MII oocytes were significantly higher in the Diphereline group (12.1 +/- 6.3 and 9.6 +/- 5.5) in comparison to the Suprefact group (9.4 +/- 6.4 and 7.2 +/- 5.1). Although the number of developed embryos in the Diphereline group was statistically higher than in the Suprefact group (6.1 +/- 3.9 vs. 4.7 +/- 3.4, p = 0.04) there was no significant difference in pregnancy rate (37.1%, 95% Cl [26.16-49.54] vs. 37.5%, 95% Cl [26.6749.75]).Conclusions: A half-dose, long-acting GnRH agonist can be successfully used in ovarian stimulation and produces a higher number of MII oocytes and embryos. The pregnancy rates with this method are acceptable.