title: [Prevalence of atrial fibrillation and relationed factors in a population in the centre Madrid].
abstract: BACKGROUND
  Atrial fibrillation is the most common arrhythmia on clinical practice and an important risk factor for ictus. The aim of this study was to know the prevalence of this arrythmia in a central district of Madrid.
  
  
  METHODS
  A retrospective study was done analysing medical records of 13,945 patients belonging to a primary care centre of Madrid. Time of study: recruitment of data from September 2000 to May 2001; analysis of data: from September 2001 to May 2002.
  
  
  RESULTS
  We obtained a total of 425 atrial fibrillations, 348 non-valvular and 77 valvular. Global prevalence of atrial fibrillation in patients over 40 years in our area was 2.52%. (2.47% male, 2.55% female). Risk factors for atrial fibrillation more frequently found in non-valvular were high blood pressure (HBP), diabetes, ischaemic heart disease and left ventricular dysfunction. Among valvulars we found HBP, left atrial size over 45 mm and left ventricular dysfunction.
  
  
  CONCLUSIONS
  Atrial fibrillation shows a prevalence and distribution in the studied area similar to that found in other European countries.
authors.affiliation: Servicio de Medicina Interna, Hospital Clínico Universitario San Carlos, Madrid, Spain.
authors.forename: F J
authors.initials: FJ
authors.lastname: Candel
authors.forename: M
authors.initials: M
authors.lastname: Matesanz
authors.forename: F
authors.initials: F
authors.lastname: Cogolludo
authors.forename: I
authors.initials: I
authors.lastname: Candel
authors.forename: C
authors.initials: C
authors.lastname: Mora
authors.forename: T
authors.initials: T
authors.lastname: Bescos
authors.forename: M
authors.initials: M
authors.lastname: Martín
authors.forename: I
authors.initials: I
authors.lastname: Vila i Costa
mesh_terms: D001281:Atrial Fibrillation / Q000453:epidemiology*; D005260:Female; D006801:Humans; D008297:Male; D015995:Prevalence; D013030:Spain / Q000453:epidemiology