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Human Reproduction, Vol 12, 1403-1408, Copyright © 1997 by Oxford University Press

ARTICLES

Prospective randomized study of an ultrashort gonadotrophin-releasing hormone agonist versus a modified suppression protocol for ovarian stimulation in intracytoplasmic sperm injection cycles

H Strohmer, S Chatwani, F Wieser, B Danninger, A Obruca and W Feichtinger
Institute of Sterility Treatment, Department of Obstetrics and Gynaecology, University of Vienna, Austria.

To compare oocyte quality and clinical outcome after an ultrashort or a modified suppression gonadotrophin-releasing hormone agonist (GnRHa) protocol for ovarian stimulation in intracytoplasmic sperm injection (ICSI) cycles, we conducted a prospective randomized study of 60 consecutive couples with severe male infertility admitted for their first in-vitro fertilization (IVF) and ICSI attempt. More cycles were cancelled after the ultrashort protocol (8/30) than after the modified suppression protocol (3/30), although the difference was not significant. There were no cases of severe ovarian hyperstimulation syndrome (OHSS) in the ultrashort group compared to three cases in the suppression group. The percentage of mature metaphase II oocytes recovered in both groups was similar (88 versus 86%), as were the fertilization or cleavage rates after ICSI. In the ultrashort group, a total of 64 embryos was replaced in 22 transfers (mean 2.9 embryos per transfer), resulting in three first trimester abortions and seven deliveries. In the suppression group, 11 deliveries were achieved after transfer of a total of 75 embryos in 27 patients (mean 2.8 embryos per transfer). In conclusion, there was no apparent difference between the two GnRHa protocols in terms of oocyte quality and clinical outcome. However, because of the lower rate of severe OHSS, in our study the ultrashort protocol was more appropriate for ovarian stimulation in ICSI cycles than the modified suppression protocol.
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