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Human Reproduction, Vol. 15, No. 9, 1943-1946, September 2000
© 2000 European Society of Human Reproduction and Embryology

Influence of position and length of uterus on implantation and clinical pregnancy rates in IVF and embryo transfer treatment cycles

P.E. Egbase,, M. Al-Sharhan and J.G. Grudzinskas,

1 IVF Centre, Maternity Hospital, Kuwait and 2 Department of Obstetrics & Gynaecology, St Bartholomew's & The Royal London School of Medicine & Dentistry, Royal London Hospital, London E1 1BB, UK

In a prospective study of 807 consecutive women shown to have an apparently normal uterus after hysterosalpingography, hysteroscopy or pelvic ultrasonography prior to IVF or intracytoplasmic sperm injection (ICSI) and embryo transfer, the position and length of the uterine cavity was measured routinely at a pre-treatment mock transfer procedure. The apparent length of the uterine cavity was <7 cm in 128 women (group 1), 7–9 cm in 594 women (group 2) and >9 cm in 85 women (group 3). The uterus was noted to be retroverted in 38.2% (308) women. The embryo transfer catheter was advanced to 5 mm from the uterine fundus based on the previously determined cavity length in all the embryo transfer procedures at 48 h after oocyte collection. Implantation and clinical pregnancy rates were not significantly different with respect to position of the uterus, difficulties encountered in passage of the catheter, mean age of the women, aetiology or duration of infertility or embryology events. An apparently greater cavity length was seen in older and/or parous women, but the difference was not statistically significant. Although the highest implantation and clinical pregnancy rates were seen in women with a cavity length of 7–9 cm (group 2) the differences were not statistically significant: group 1, 18.9 and 36.7%; group 2, 21.0 and 46.5%; and group 3, 17.3 and 32.9% respectively. The incidence of ectopic pregnancy per reported clinical pregnancy was highest in group 1 women, being 14.9% (7/47) in comparison with group 2 (1.8%, 5/276) and group 3 (0%, 0/27) (P < 0.0005), suggesting that the size of the uterus is a critical factor in the aetiology of ectopic pregnancy in IVF/ICSI–embryo transfer.

Key words: ectopic/embryo transfer/implantation/pregnancy/uterus

3 To whom correspondence should be addressed at: Department of Obstetrics & Gynaecology, St Bartholomew's & The Royal London School of Medicine & Dentistry, Royal London Hospital, London, E1 1BB, UK. E-mail: j.g.grudzinskas{at}mds.qmw.ac.uk


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