Journal
JOURNAL OF ASSISTED REPRODUCTION AND GENETICS
Volume 29, Issue 6, Pages 507-512Publisher
SPRINGER/PLENUM PUBLISHERS
DOI: 10.1007/s10815-012-9751-9
Keywords
Human oocyte vitrification; In vitro maturation rate; Survival rate; Fertilization and development rates
Funding
- Fonds National Recherche Scientifique (FNRS) of Belgium
- Merck Pharmaceuticals
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This study aims to determine if in-vitro maturation (IVM) of human immature oocytes should be performed before or after vitrification. A total of 184 immature oocytes were randomly divided into two different groups: 100 were vitrified at metaphase II (MII) stage 24 h-48 h after IVM (group 1) and 84 were immediately vitrified at germinal vesicle (GV) or metaphase I (MI) stages and in vitro matured after warming (group 2). Survival rate after warming was similar in both groups (86.9% versus 84.5%). However, oocyte maturation rate per collected oocyte was significantly higher for oocytes matured before vitrification (group 1, 46%) than for oocytes vitrified before IVM (group 2, 23.8%) (p < 0.01). Consequently, the number of MII oocytes inseminated per oocyte collected was significantly higher for group 1 (40%) than for group 2 (23.8%) (p < 0.05). IVM procedure is more efficient when it is performed before oocyte vitrification.
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