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Hum. Reprod. Advance Access originally published online on October 27, 2005
Human Reproduction 2006 21(3):701-704; doi:10.1093/humrep/dei365
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© The Author 2005. 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

Is controlled ovarian stimulation in intrauterine insemination an acceptable therapy in couples with unexplained non-conception in the perspective of multiple pregnancies?

M.M.E. van Rumste1, J.E. den Hartog, J.C.M. Dumoulin, J.L.H. Evers and J.A. Land

Research Institute Growth and Development (GROW) and Department of Obstetrics and Gynaecology, Academic Hospital Maastricht, P.O.Box 5800, 6202 AZ Maastricht, The Netherlands

1 To whom correspondence should be addressed. E-mail: m.vanrumste{at}mmc.nl

BACKGROUND: Controlled ovarian stimulation (COS) with intrauterine insemination (IUI) is a common treatment in couples with unexplained non-conception. Induction of multifollicular growth is considered to improve pregnancy outcome, but it contains an increased risk of multiple pregnancies and ovarian hyperstimulation syndrome. In this study the impact of the number of follicles (>14 mm) on the ongoing pregnancy rate (PR) and multiple PR was evaluated in the first four treatment cycles. METHODS: A retrospective cohort study was performed in all couples with unexplained non-conception undergoing COS-IUI in the Academic Hospital of Maastricht. The main outcome measure was ongoing PR. Secondary outcomes were ongoing multiple PR, number of follicles of ≥14 mm, and order of treatment cycle. RESULTS: Three hundred couples were included. No significant difference was found in ongoing PR between women with one, two, three or four follicles respectively (P = 0.54), but in women with two or more follicles 12/73 pregnancies were multiples. Ongoing PR was highest in the first treatment cycle and declined significantly with increasing cycle order (P = 0.006), while multiple PR did not change. CONCLUSIONS: In COS-IUI for unexplained non-conception, induction of more than one follicle did not improve the ongoing PR, but increased the risk of multiple pregnancies. Multiple PR remained high in the first four cycles with multifollicular stimulation. Therefore, in order to reduce the number of multiple pregnancies, in all IUI cycles for unexplained non-conception monofollicular growth should be aimed at.

Key words: controlled ovarian stimulation/follicle number/intrauterine insemination/multiple pregnancy/subfertility


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