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Korean Journal of Fertility and Sterility 2005;32(4):331-336.
Published online December 1, 2005.
Effects of Age on in vitro Maturation and Fertilization of Immature Oocytes from Stimulated Cycles in Human IVF-ET Program.
Sang Hoon Han, Jung Ryeol Lee, Hyun Jun Kim, Jung Hee Moon, Byung Chul Jee, Seung Yup Ku, Chang Suk Suh, Seok Hyun Kim, Young Min Choi, Jung Gu Kim, Shin Yong Moon
1Department of Obstetrics and Gynecology, Seoul National University Bundang Hospital, Seongnam, Gyeonggi-do, Korea.
2Department of Obstetrics and Gynecology, College of Medicine, Seoul National University, Seoul, Korea.
3Institute of Reproductive Medicine and Population, Medical Research Center, Seoul National University, Seoul, Korea.
Abstract
OBJECTIVE
To investigate the effects of female age on in vitro maturation and fertilization of immature oocytes from controlled ovarian hyperstimulation (COH) in human IVF-ET program. METHOD: A total of 96 immature oocytes (GV & metaphase I) obtained from 40 cycles of IVF-ET (29 patients). The mean age of female patients was 31.8+/-3.1 years. Ovulation was triggered by urinary or recombinant hCG. Immature oocytes were cultured with YS medium containing 30% of patients' human follicular fluids, LH (1 IU/mL), FSH (1 IU/mL) and EGF (10 ng/mL), and then matured oocytes were fertilized by ICSI. In vitro maturation and fertilization of immature oocytes were analyzed according to age of female (< 34 or > or = 34 years). RESULTS: The maturation rate was similar between two groups (68% vs 64%). The fertilization rate of in?vitro-matured oocytes was higher in patients < 34 years old, but there was no statistical significance (64% vs 50%, p=0.347). The fertilization rate of in-vitro-matured oocytes was significantly lower compared with those of in-vivo-matured oocytes in both age groups (64% vs 79%, p=0.035, 50% vs 86%, p=0.007). CONCLUSION: In older female group, fertilization rate of in-vitro-matured oocytes seems to be decreased. Further investigations should be warranted to increase fertilization potential of in-vitro-matured oocytes.
Key Words: Immature oocyte; Female age; In vitro maturation; Controlled ovarian hyperstimulation; Fertilization


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