title: Risk factors for ectopic pregnancy in assisted reproduction.
abstract: OBJECTIVE
  To identify risk factors for ectopic pregnancy (EP) after IVF-ET.
  
  
  METHODS
  Retrospective cohort study.
  
  
  METHODS
  In vitro fertilization clinic at a university hospital.
  
  
  METHODS
  A total of 725 women who conceived after IVF were studied with regard to background factors, indications for IVF, and factors related to the IVF procedure through review of their medical charts. The rate of EP was 4%, corresponding with 29 EPs, of which 2 were heterotopic.
  
  
  METHODS
  None.
  
  
  METHODS
  Pregnancy outcome, defined as intrauterine pregnancy or EP. Background factors, indications for IVF, and factors related to the IVF procedure were analyzed for possible correlation with the outcome of EP. Risk factors for EP were identified by logistic regression analysis.
  
  
  RESULTS
  Tubal factor infertility, various previous abdominal surgeries, previous EP or pelvic infection, presence of a hydrosalpinx or fibroid, and type of transfer catheter used showed a positive correlation with EP as outcome. Logistic regression analysis identified two factors with predictive power: tubal factor infertility and previous myomectomy.
  
  
  CONCLUSIONS
  Tubal factor infertility was the most prominent risk factor for EP after IVF. Previous myomectomy appeared to be another important risk factor, but this is a new finding that needs to be confirmed by further study.
authors.affiliation: Department of Obstetrics and Gynecology, Sahlgrenska University Hospital, Göteborg University, Sweden. annika.strandell@medfak.gu.se
authors.forename: A
authors.initials: A
authors.lastname: Strandell
authors.forename: J
authors.initials: J
authors.lastname: Thorburn
authors.forename: L
authors.initials: L
authors.lastname: Hamberger
mesh_terms: D000328:Adult; D005260:Female; D005307:Fertilization in Vitro; D006801:Humans; D016015:Logistic Models; D011247:Pregnancy; D011256:Pregnancy Outcome; D011271:Pregnancy, Ectopic; D011336:Probability; D012044:Regression Analysis; D012189:Retrospective Studies; D012307:Risk Factors