ICSI outcome in patients of 40 years age and over: a retrospective analysis.

Objective: To report and analyse our experience with ICSI treatment in infertile women >/=40 years of age, with the intention of contributing to current debates on the effect of aging on the reproductive potential.

Study Design: 107 infertile couples in which the female partner was aged >/=40 years and who received ICSI treatment between January 1996 and December 1998.

Results: A total of 107 women underwent 171 treatment cycles during this period. Of 171 cycles initiated 33 were cancelled (cancellation rate=19.3%). In this way, 17 women did not have embryo transfer at all, while 90 patients had 138 cycles with oocyte retrieval and successful embryo transfer, with a mean number of embryos per transfer 2.36. Sixteen pregnancies occurred and eight of them ended in spontaneous abortion. The implantation rate was 4.9%, the pregnancy rate per initiated cycle was 9.35% and per transfer cycle 11.59%. The miscarriage rate was 50%. Moreover, 12 patients had supernumerary embryos, that were cryopreserved and transferred in 17 thawing cycles and resulted in two pregnancies ending in abortion. All pregnancies occurred when three embryos were available, except in two cases with two available embryos. The great majority of the total pregnancies (16 of 18) resulting in women aged between 40 and 42 years.

Conclusion: Our data show that women 40 and older with existing ovarian function may benefit from ICSI treatment, even when the indication for treatment is male factor infertility. Supernumerary embryos, that are cryopreserved and transferred in subsequent cycles can improve the overall pregnancy rates per oocyte retrieval, although these women should be aware of the very high risk of miscarriage.