title: Endometriosis and spontaneous abortion rate: a cohort study in infertile women.
abstract: OBJECTIVE
  To ascertain if there is an association between endometriosis and spontaneous abortion.
  
  
  METHODS
  Prospective cohort study.
  
  
  METHODS
  Medical School Hospital.
  
  
  METHODS
  174 infertile women laparoscopically diagnosed with endometriosis and 174 infertile women in which endometriosis was ruled out by laparoscopy, in the same period of time.
  
  
  METHODS
  Spontaneous abortion. Non-progressive gestational sac and/or histological study.
  
  
  RESULTS
  Per woman abortion rate was 7.47% (13/174) in the endometriosis group, similar to 5.74% (10/174) in the infertile women without endometriosis (RR=1.32: CI=0.53-3.36). Nor were there any differences in the per pregnancy abortion rate: 20.96% (13/62) in endometriosis vs. 16.94% (10/59) in non-endometriosis (RR=1.3; CI=0.47-3.57). The abortion rate was similar in the different AFS stages: 22.86% (8/35) in stage I, 16.67% (3/18) in II, 25% (1/4) in III and 20% (1/5) in IV. In stage I no differences were observed in patients who were managed expectantly or with medical treatment.
  
  
  CONCLUSIONS
  Endometriosis is not associated with an increased abortion rate. The severity of disease expressed by AFS staging is not associated with an increase in the abortion rate. In stage I the treatment of endometriosis did not decrease abortion rates.
authors.affiliation: Department of Obstetrics and Gynecology, Hospital of Cruces-Baracaldo, País Vasco University, Vizcaya, Spain.
authors.forename: R
authors.initials: R
authors.lastname: Matorras
authors.forename: F
authors.initials: F
authors.lastname: Rodríguez
authors.forename: G
authors.initials: G
authors.lastname: Gutierrez de Terán
authors.forename: J I
authors.initials: JI
authors.lastname: Pijoan
authors.forename: O
authors.initials: O
authors.lastname: Ramón
authors.forename: F J
authors.initials: FJ
authors.lastname: Rodríguez-Escudero
mesh_terms: D000022:Abortion, Spontaneous / Q000453:epidemiology* / Q000209:etiology; D000328:Adult; D015331:Cohort Studies; D004715:Endometriosis / Q000150:complications*; D005260:Female; D006801:Humans; D015994:Incidence; D007247:Infertility, Female / Q000150:complications*; D011247:Pregnancy; D011446:Prospective Studies; D012307:Risk Factors