Journal
EUROPEAN JOURNAL OF CARDIO-THORACIC SURGERY
Volume 31, Issue 5, Pages 817-820Publisher
OXFORD UNIV PRESS INC
DOI: 10.1016/j.ejcts.2007.02.010
Keywords
postoperative atrial fibrillation; renin-angiotensin-system; cardiac surgery
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Background: Two recent meta-analyses demonstrated that angiotensin converting enzyme inhibitors (ACEIs) and angiotensin receptor blockers (ARBs) reduce the risk of developing new-onset atrial. fibrillation (AF) by nearly 50%. However, the ability of ACEls or ARBs to prevent postoperative atrial, fibrillation (POAF) after cardiac surgery has not been adequately evaluated. Objective: To evaluate the impact of preoperative ACEI or ARB use on the incidence of POAF after cardiac surgery. Methods: Patients undergoing coronary artery bypass grafting and/or valvular surgery from the atrial fibrillation suppression trials II and III (AFIST II and III) randomized, controlled trials were evaluated in this cohort evaluation. Data in respect to patient demographics, surgical characteristics, medication utilization and the incidence of POAF (defined as AF lasting at least 5 min in duration documented by telemetry) were all, uniformly and prospectively collected as part of AFIST II and III. Multivariate logistic regression was utilized to calculate adjusted odds ratios with 95% confidence intervals. Results: A total of 338 patients were evaluated of which 175 (51.8%) received an ACEI or ARB preoperativety and 163 (48.2%) did not. The study population was 65.7 +/- 9.1 years of age, 77.8% were mate, 11.2% underwent valve surgery, 3.6% had prior AF, 10.1% had heart failure and 84.0 and 37.9% received postoperative beta-blockade and prophylactic amiodarone, respectively. In total, 110 (32.5%) patients developed POAF Upon multivariate logistic regression, the preoperative use of an ACEI or ARB was not found to be associated with a statistically significant reduction in POAF (adjusted odds ratio; 0.71, 95% CIs 0.42-1.20). Conclusions: Although preoperative ACEI or ARB use reduced the odds of developing POAF by 29%, this association with not found to be statistically significant. A study with approximately 600 subjects would be needed to discern if ACEls or ARBs truly impact POAF. (c) 2007 European Association for Cardio-Thoracic Surgery. Published by Elsevier B.V. All. rights reseried.
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