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- Källén, Bengt, et al.
(författare)
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Cerebral palsy in children born after in vitro fertilization. Is the risk decreasing?
- 2010
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Ingår i: European journal of paediatric neurology. - : Elsevier Science B.V., Amsterdam. - 1090-3798 .- 1532-2130. ; 14:6, s. 526-530
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Tidskriftsartikel (refereegranskat)abstract
- Background: Infants born after in vitro fertilization (IVF) differ from spontaneously conceived infants in a number of aspects which could increase the risk for future cerebral palsy (CP), e.g., multiple births, preterm births, neonatal complications. Aims: To follow up children conceived by IVF with respect to risk for CP. Methods: Infants born after IVF were identified from all IVF clinics in Sweden 1982-2007. Perinatal characteristics were obtained by linkage with the Medical Birth Register. The presence of CP in children born after IVF and in other children was identified from the Patient Register which contains diagnoses given at hospitalizations or specialist outpatient clinics. The risk for CP after IVF was studied after adjustment for year of birth, maternal age, parity, and smoking, all factors which co-vary both with IVF and with CP. Stratification was made for singletons and multiple births and for various neonatal outcomes. Results: The adjusted odds ratio for CP after IVF was 1.81 (95% confidence interval, 95% CI 1.52-2.13), lower and not statistically significant when singletons or when unlike-sexed twins were analyzed. Stratification for various neonatal characteristics also reduced odds ratios to non-significant levels. For the last few years of the study (2004-2007) when the twinning rate after IVF was less than10%, the odds ratio for CP was 0.97 (95% CI 0.57-1.66). Conclusions: The moderately increased risk for CP was most likely a consequence of an increased risk of neonatal morbidity, notably associated with multiple births.
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- Källén, Bengt, et al.
(författare)
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In vitro fertilisation in Sweden: obstetric characteristics, maternal morbidity and mortality
- 2005
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Ingår i: Bjog. - : Wiley. ; 112:11, s. 1529-1535
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Tidskriftsartikel (refereegranskat)abstract
- OBJECTIVE: To investigate obstetric characteristics, maternal morbidity and mortality among Swedish women giving birth after in vitro fertilisation (IVF) treatment. DESIGN: Register study. SETTING: Nationwide study in Sweden. SAMPLE: All women known to have had IVF in Sweden 1982-2001. METHODS: Using Swedish health registers, women who had given birth after IVF were identified from all Swedish IVF clinics and compared with all women who gave birth. Analysis was performed with the Mantel-Haenszel technique. MAIN OUTCOME MEASURES: Diagnoses during pregnancy, at delivery and at re-admission within 60 days after delivery and risk of cancer. RESULTS: IVF women had an increased risk of bleeding in early pregnancy [odds ratio (OR) = 4.59, 95% confidence interval (95% CI) 4.08-5.15] and of ovarian torsion during pregnancy (OR = 10.6, 5.69-10.7). They were also more likely to encounter pre-eclampsia (OR = 1.63, 1.53-1.74), placental abruption (2.17, 1.74-2.72), placenta praevia (3.65, 3.15-4.23), bleeding in association with vaginal delivery (1.40, 1.38-1.50) and premature rupture of membranes (PROM) (2.54, 2.34-2.76). Interventions including caesarean sections (1.38, 1.32-1.43) and induction of labour (1.37, 1.29-1.46) in singleton pregnancies was more frequent. The type of IVF method had little effect on these results, but there was a tendency for women who had received intra-cytoplasmatic sperm injection (ICSI) to have slightly fewer complications than women having standard IVF. There was a significant decrease in cancer risk after IVF (0.79, 0.69-0.91) but a suggested increase in the risk of ovarian cancer both before (2.70, 1.49-4.91) and after (2.08, 1.15-3.76) IVF. No change in mortality was observed. CONCLUSIONS: Women treated with IVF had an increased obstetric morbidity. This seems to contribute little to the well-known increased risk of preterm delivery.
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