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Human Reproduction, Vol. 10, No. 3, pp. 572-575, 1995
© 1995 European Society of Human Reproduction and Embryology


research-article

Infertility: In-vitro fertilization in completely natural cycles*

Una M. Fahy1, David J. Cahill, Peter G. Wardle and Michael G.R. Hull

Reproductive Medicine Unit, Department of Obstetrics and Gynaecology, University of Bristol, St Michael's Hospital Bristol BS2 8EG, UK

Correspondence: 1To whom correspondence should be addressed at: Department of Obstetrics and Gynaecology, Leicester Royal Infirmary NHS Trust, Infirmary Square, Leicester LEI 5WW, UK

Our objective was to assess the efficacy of in-vitro fertilization (IVF) in natural ovarian cycles in couples with tubal and unexplained infertility. A prospective study design was used. A total of 39 fully investigated couples, who were patients at the Reproductive Medicine Unit, St Michael's Hospital, Bristol, UK, took part; they were diagnosed with either tubal disease (n = 26) or unexplained infertility (n = 13). Procedures involved daily capillary blood sampling, daily vaginal ultrasonography and vaginal oocyte recovery under sedation at mid-cycle. The main outcome measures were fertilization, implantation and pregnancy rates. Although more of the women with tubal disease were parous, there were no other significant differences between the two groups. The 39 couples with infertility of tubal or unexplained aetiology had 79 cycles of IVF in otherwise completely natural cycles. The overall fertilization rate was 80% and the implantation rate was 14.0%. A trend was observed for higher success rates in women with tubal disease. We conclude that natural cycle IVF and embryo transfer offers an acceptable chance of pregnancy and an opportunity for the in-depth investigation of follicular and ovarian function in couples with defined causes of infertility. The possibly lower success rate in women with unexplained infertility warrants further study of follicular function and endocrinology.

Key words: implantation rates/natural cycle IVF/pregnancy rates/transvaginal oocyte recovery

*Presented at the Ninth Annual Meeting of ESHRE, Thessaloniki, Greece, June 27-30, 1990


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