title: [Risk factors of pulmonary arterial hypertension in patients with atrial septal defect at high altitude area].
abstract: OBJECTIVE
  To analyze risk factors of pulmonary arterial hypertension (PAH) in patients with atrial septal defect (ASD) patients living at above 2000 m high altitude area.
  
  
  METHODS
  We retrospectively analyzed the incidence of PAH in 526 ASD patients out of 1178 congenital heart disease patients who were hospitalized in Qinghai cardiovascular hospital between January 2007 to December 2009 and explored the risk factors including gander, age, altitude, defect size and nationalities for developing PAH in ASD patients using binary logistic regression.
  
  
  RESULTS
  PAH prevalence was 68.4% (360/526) in ASD patients. The risk factors of developing PAH in these ASD patients were defect size (OR: 1.200, 95%CI: 1.156 - 1.246, P = 0.000), age (OR: 1.027, 95%CI: 1.003 - 1.052, P = 0.025) and altitude (OR: 1.389, 95%CI: 1.001 - 1.637, P = 0.043) while gender and nationality were not risk factors for PAH. The incidence of developing PAH increased with aging (P = 0.000). The standardized ratio of PAH at ≥ 3500 m was 74.8% which was significantly higher than that at 2000 - 2499 m altitude (66.2%, P = 0.005) and at 2500 - 3499 m altitude (66.9%, P = 0.005).
  
  
  CONCLUSIONS
  The risk for developing PAH is high in patients living at high altitude area. The risk factors of developing PAH in ASD patients living at high altitude are defect size, age and altitude.
authors.affiliation: Qinghai Cardio-Cerebrovascular Disease Special Hospital, Xining, China.
authors.forename: Sheng-gui
authors.initials: SG
authors.lastname: Qi
authors.forename: Xin-hui
authors.initials: XH
authors.lastname: Jin
authors.forename: Qiu-hong
authors.initials: QH
authors.lastname: Chen
authors.forename: Guo-rong
authors.initials: GR
authors.lastname: Qi
authors.forename: Lin
authors.initials: L
authors.lastname: Lu
authors.forename: Lei
authors.initials: L
authors.lastname: Yang
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D000531:Altitude; D002648:Child; D002675:Child, Preschool; D005260:Female; D006344:Heart Septal Defects, Atrial / Q000150:complications / Q000453:epidemiology*; D006801:Humans; D006976:Hypertension, Pulmonary / Q000150:complications / Q000453:epidemiology*; D015994:Incidence; D007223:Infant; D008297:Male; D008875:Middle Aged; D012189:Retrospective Studies; D012307:Risk Factors; D055815:Young Adult