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Hum. Reprod. Advance Access originally published online on April 27, 2006
Human Reproduction 2006 21(8):2131-2135; doi:10.1093/humrep/del124
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© The Author 2006. Published by Oxford University Press on behalf of the European Society of Human Reproduction and Embryology. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

A randomized double-blind controlled study on the efficacy of laser zona pellucida thinning on live birth rates in cases of advanced female age

N. Frydman1,3, S. Madoux1, L. Hesters1, C. Duvernoy1, E. Feyereisen2, A. Le Du1, G. Tachdjian1, R. Frydman2 and R. Fanchin2

1 Department of Genetic and Reproduction and 2 Department of Gynaecology and Obstetric, Hospital Antoine Béclère, Clamart, France

3 To whom correspondence should be addressed at: Service de Génétique et Reproduction, Hôpital Antoine Béclère, 157 rue de la Porte de Trivaux, 92140 Clamart, France. E-mail: nelly.frydman{at}abc.ap-hop-paris.fr

BACKGROUND: It is conceivable that defective embryo hatching plays a part in the mechanisms involved in the decrease of embryo implantation rates with advancing age. In an effort to test this hypothesis, we tested the effectiveness of assisted hatching (AH) in women ≥37 years of age. METHODS: We prospectively studied 103 IVF-embryo transfer patients undergoing 103 embryo transfers. All of them were ≥37 years of age and had <3 previous IVF-embryo transfer attempts. Laser-AH of transferred embryos was either performed (AH group, n = 49) or not (control group, n = 54) according to randomized and double-blind methodology. Primary outcome was live birth rate. RESULTS: Population characteristics were comparable in AH and control groups as well as the mean number of embryos transferred (2.7 ± 0.6 versus 2.7 ± 0.6) and the prevalence of top quality embryos transferred (65 versus 59%, respectively). We failed to find any statistically significant difference between AH and control groups with regard to implantation (16.1 versus 16.7%, respectively) and live birth rates (22.4 versus 29.6%, respectively). CONCLUSION: The present study indicates that AH does not improve IVF-embryo transfer outcome in women aged ≥37 years.

Key words: advanced female age/assisted hatching/implantation rates/live birth rates


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