title: Atrial fibrillation in patients with constrictive pericarditis: the significance of pericardial calcification.
abstract: BACKGROUND
  Although atrial fibrillation (AF) is commonly encountered in patients with constrictive pericarditis (CP), little has been done to clarify its associated predisposing factors. Our aim was to evaluate the association of age, gender, disease duration, and pericardial calcification with AF in these patients.
  
  
  METHODS
  The medical records of 44 patients with CP were reviewed. There were 13 (29.5%) with AF and 31 (70.5%) with sinus rhythm. The two groups were compared for demographic variables, disease duration, and the presence of pericardial calcification.
  
  
  RESULTS
  The male-to-female ratio was 3.4:1. Calcification was seen in 11 (25%) of the entire group. AF was much more common in those with calcification than those with sinus rhythm (odds ratio, 7.87 [95% CI, 1.73-35.78], P=0.008). There was no association between the presence of AF and the age (P=0.156) or gender (P approximately 1.00). Logistic regression, however, showed that the chance of developing AF increased by 27% by each year of increase in disease duration (P=0.025).
  
  
  CONCLUSIONS
  It seems that in patients with CP, the presence of pericardial calcification and the increasing disease duration are associated with a higher chance of developing AF.
authors.affiliation: Department of Medicine (Cardiology), Shiraz University of Medical Sciences, Shiraz, Iran. grezaian@gmail.com
authors.forename: Gholam R
authors.initials: GR
authors.lastname: Rezaian
authors.forename: Masoud
authors.initials: M
authors.lastname: Poor-Moghaddas
authors.forename: Javad
authors.initials: J
authors.lastname: Kojuri
authors.forename: Shahed
authors.initials: S
authors.lastname: Rezaian
authors.forename: Lida
authors.initials: L
authors.lastname: Liaghat
authors.forename: Najaf
authors.initials: N
authors.lastname: Zare
mesh_terms: D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D001281:Atrial Fibrillation / Q000453:epidemiology / Q000209:etiology*; D002114:Calcinosis / Q000150:complications* / Q000453:epidemiology; D002648:Child; D004562:Electrocardiography; D005260:Female; D006801:Humans; D007492:Iran / Q000453:epidemiology; D016015:Logistic Models; D008297:Male; D008875:Middle Aged; D010494:Pericarditis, Constrictive / Q000150:complications* / Q000453:epidemiology; D012307:Risk Factors; D012737:Sex Factors; D018709:Statistics, Nonparametric