title: Prevalence of interatrial block in a general population of elderly people.
abstract: BACKGROUND
  Interatrial block (IAB: P wave > or = 110 ms) is highly prevalent in people > or =65 years old living in a community.
  
  
  METHODS
  We investigated 720 consecutive people age > or =65 years old, from the general population, with the intention of evaluating the prevalence of IAB in their electrocardiogram. After excluding 42 people with atrial fibrillation and atrial flutter (5%) or having a permanent pacemaker (0,83%), we evaluated the electrocardiograms of the remaining 678 people with sinus rhythm.
  
  
  RESULTS
  We identified 400 (59%) persons with IAB with a similar distribution between men (58.5%) and women (59.4%). IAB was also identified in 347 from a total of 570 hypertensive people (60,9%) and only in 53 out of 108 (49.1%) nonhypertensive people (P = 0.015).
  
  
  CONCLUSIONS
  The surprisingly large prevalence of the IAB in the general older population emphasizes the importance of the early recognition of this abnormality from the surface 12-lead electrocardiogram.
authors.affiliation: 1st Department of Cardiology, AHEPA Hospital, Aristotle University, Thessaloniki, Greece. iliasninios@gmail.com
authors.forename: Ilias
authors.initials: I
authors.lastname: Ninios
authors.forename: Christodoulos
authors.initials: C
authors.lastname: Pliakos
authors.forename: Vlasios
authors.initials: V
authors.lastname: Ninios
authors.forename: Haralampos
authors.initials: H
authors.lastname: Karvounis
authors.forename: George
authors.initials: G
authors.lastname: Louridas
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D016009:Chi-Square Distribution; D004562:Electrocardiography; D005260:Female; D006115:Greece / Q000453:epidemiology; D006325:Heart Atria / Q000503:physiopathology*; D006327:Heart Block / Q000453:epidemiology* / Q000503:physiopathology*; D006801:Humans; D008297:Male; D015995:Prevalence