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Human Reproduction, Vol. 16, No. 8, 1700-1702, August 2001
© 2001 European Society of Human Reproduction and Embryology

Pregnancy and delivery after cryopreservation of zygotes produced by in-vitro matured oocytes retrieved from a woman with polycystic ovarian syndrome

R.C. Chian,1, B. Gülekli, W.M. Buckett and S.L. Tan

McGill Reproductive Center, Department of Obstetrics and Gynecology, McGill University, Montreal, Canada

This case report describes the birth of a healthy infant after cryopreservation of zygotes produced by in-vitro matured oocytes retrieved from an anovulatory woman with polycystic ovarian syndrome (PCOS). To initiate the treatment cycle, the patient received intravaginal progesterone at night for 10 days to induce a withdrawal bleed. Oocyte retrieval was performed on day 11 following a withdrawal bleed. The patient was administered 10 000 IU of HCG subcutaneously 36 h prior to oocyte collection. A total of 63 immature oocytes were obtained; 10 were morphologically abnormal. Following incubation for 24–48 h in the maturation medium, TC-199 supplemented with 20% patient's own serum, 75 mIU/ml FSH and LH, 77.4% (41/53) of the oocytes were at the metaphase-II stage. Thirty-one (31/41, 75.6%) were fertilized using ICSI with her husband's spermatozoa, 15 fertilized oocytes were cultured for embryo transfer and 16 were frozen at the pronuclear stage. Pregnancy ensued following fresh embryo transfer. Unfortunately, the pregnancy was miscarried eight weeks later. However, the second frozen–thawed embryo transfer attempt resulted in a full-term pregnancy with delivery of a healthy male infant.

Key words: Cryopreservation/immature oocytes/ICSI/pregnancy/PCOS

1 To whom correspondence should be addressed at: Toronto Center for Advanced Reproductive Technology, 150 Bloor Street West, Toronto, Ontario, Canada M5S 2X9. E-mail: rchian{at}tcartonline.com


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