title: In vitro fertilisation in Sweden: obstetric characteristics, maternal morbidity and mortality.
abstract: OBJECTIVE
  To investigate obstetric characteristics, maternal morbidity and mortality among Swedish women giving birth after in vitro fertilisation (IVF) treatment.
  
  
  METHODS
  Register study.
  
  
  METHODS
  Nationwide study in Sweden.
  
  
  METHODS
  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.
  
  
  METHODS
  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.
authors.affiliation: Tornblad Institute, University of Lund, Lund, Sweden.
authors.forename: Bengt
authors.initials: B
authors.lastname: Källén
authors.forename: Orvar
authors.initials: O
authors.lastname: Finnström
authors.forename: K G
authors.initials: KG
authors.lastname: Nygren
authors.forename: Petra
authors.initials: P
authors.lastname: Otterblad Olausson
authors.forename: Ulla-Britt
authors.initials: UB
authors.lastname: Wennerholm
mesh_terms: D000328:Adult; D002423:Cause of Death; D036861:Delivery, Obstetric / Q000706:statistics & numerical data; D005260:Female; D005307:Fertilization in Vitro / Q000401:mortality*; D005322:Premature Rupture of Fetal Membranes / Q000401:mortality; D006760:Hospitalization / Q000706:statistics & numerical data; D006801:Humans; D008428:Maternal Mortality; D016471:Ovarian Hyperstimulation Syndrome / Q000401:mortality; D011247:Pregnancy; D011248:Pregnancy Complications / Q000401:mortality*; D047928:Premature Birth / Q000401:mortality; D012042:Registries; D012307:Risk Factors; D013548:Sweden