title: Atrial fibrillation after coronary artery bypass grafting in elderly patients: incidence and risk factor analysis.
abstract: OBJECTIVE
  New-onset atrial fibrillation (AF) is the most frequent arrhythmic complication after coronary artery bypass grafting (CABG). Elderly patients who undergo this operation may have a different risk profile from the general population. The aim of this study was to identify risk factors for post-CABG AF in the elderly population.
  
  
  METHODS
  Between September 2001 and December 2005, 426 elderly patients (age >/= 65 years) underwent CABG at our center. Ninety-one developed post-CABG AF (AF group), and the other 335 (no-AF group) did not develop this complication. Multivariate analysis (odds ratio, +/- 95 % CI, P value) was used to identify independent clinical predictors of post-CABG AF.
  
  
  RESULTS
  The incidence of post-CABG AF in elderly patients during the study period was 21.4 %. Multivariate analysis identified age (OR 1.07, P < 0.009), age >/= 75 years (OR 1.77, P < 0.042), preoperative renal insufficiency (OR 5.09, P < 0.035), EuroSCORE (OR 1.18, P < 0.038), and cross-clamping time (OR 1.02, P < 0.012) as predictors of AF occurrence. The AF group had a significantly longer mean intensive care unit (ICU) stay (3.8 +/- 4.7 vs. 2.5 +/- 1.3 days for AF vs. no-AF; P = 0.0001), and a significantly higher proportion of patients with prolonged (>/= 6 days) ICU stays (8.8 % vs. 3.2 %, respectively; P = 0.033). Hospital mortality was 3.2 % in the no-AF group and 2.2 % in the AF group ( P = 0.74).
  
  
  CONCLUSIONS
  This study of elderly patients reveals some novel predictors of post-CABG AF, most notably preoperative renal insufficiency and EuroSCORE. It is important to identify risk factors for post-CABG AF in all patient groups as this knowledge might lead to better prevention of this problem and its potential consequences.
authors.affiliation: Department of Cardiovascular Surgery, Turgut Ozal Medical Center, Inonu University, Malatya, Turkey. vnisanoglu@inonu.edu.tr
authors.forename: V
authors.initials: V
authors.lastname: Nisanoglu
authors.forename: N
authors.initials: N
authors.lastname: Erdil
authors.forename: M
authors.initials: M
authors.lastname: Aldemir
authors.forename: B
authors.initials: B
authors.lastname: Ozgur
authors.forename: H
authors.initials: H
authors.lastname: Berat Cihan
authors.forename: S
authors.initials: S
authors.lastname: Yologlu
authors.forename: B
authors.initials: B
authors.lastname: Battaloglu
mesh_terms: D000368:Aged; D001281:Atrial Fibrillation / Q000453:epidemiology* / Q000209:etiology / Q000503:physiopathology; D001026:Coronary Artery Bypass / Q000009:adverse effects*; D015716:Electrocardiography, Ambulatory; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D015994:Incidence; D008297:Male; D017202:Myocardial Ischemia / Q000601:surgery*; D011183:Postoperative Complications; D012189:Retrospective Studies; D018570:Risk Assessment; D012307:Risk Factors; D014421:Turkey / Q000453:epidemiology