Human Reproduction, Vol. 17, No. 5, 1391-1398,
May 2002
© 2002 European Society of Human Reproduction and Embryology
Neonatal outcome and congenital malformations in children born after in-vitro fertilization
1 Department of Public Health Science and General Practice, 2 Department of Obstetrics and Gynecology, University Hospital of Oulu, Oulu, 3 National Research and Development Center for Welfare and Health, Helsinki, Finland and 4 Department of Epidemiology and Public Health, Imperial College School of Medicine, London, UK
BACKGROUND: To evaluate the neonatal outcome and the prevalence of congenital malformations in children born after IVF in northern Finland we carried out a population-based study with matched controls. METHODS: Firstly, 304 IVF children born in 1990–1995 were compared with 569 controls, representing the general population in proportion of multiple births, randomly chosen from the Finnish Medical Birth Register (FMBR) and matched for sex, year of birth, area of residence, parity, maternal age and social class. Secondly, plurality matched controls (n = 103) for IVF twins (n =103) were randomly chosen from the FMBR and analysed separately. Additionally, IVF singletons (n = 153) were compared with singleton controls (n = 287). Mortality rates were compared with national figures from FMBR. RESULTS: Most mortality rates were twice as high as national figures in the general population. When compared with the control group representing the general population, the incidences of preterm birth [odds ratio (OR) 5.6, 95% confidence interval (CI) 3.7–8.6], very low birth weight (OR 6.2, 95% CI 2.0–19.0), low birth weight (OR 9.8, 95% CI 5.6–17.3), neonatal morbidity (OR 2.4, 95% CI 1.7–3.4) and hospitalization (OR 3.2, 95% CI 2.2–4.6) were significantly higher in the IVF group. The prevalence of heart malformations was four-fold in the IVF population than in the controls representing the general population (OR 4.0, 95% CI 1.4–11.7). CONCLUSIONS: Neonatal outcome after IVF is worse than in the general population with similar maternal age, parity and social standing, mainly due to the large proportion of multifetal births after IVF. The higher prevalence of heart malformations does not solely arise from multiplicity but from other causes. In order to improve neonatal outcome after IVF, the number of embryos transferred should be limited to a minimum.
Key words: congenital malformations/hospitalization/in-vitro fertilization/neonatal outcome
5 To whom correspondence should be addressed at: Department of Obstetrics and Gynecology, University Hospital of Oulu, PO BOX 24, 90029 Oulu, Finland. E-mail: sari.koivurova{at}oulu.fi
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