title: Effect of angiotensin-converting enzyme inhibitors or angiotensin receptor blockers on the frequency of post-cardiothoracic surgery atrial fibrillation.
abstract: BACKGROUND
  A recent meta-analysis demonstrated that angiotensin-converting enzyme (ACE) inhibitors and angiotensin receptor blockers (ARBs) reduce the incidence of new-onset atrial fibrillation by nearly 50%. However, the ability of ACE inhibitors or ARBs to prevent post-cardiothoracic surgery (CTS) atrial fibrillation, when used postoperatively, has yet to be evaluated.
  
  
  OBJECTIVE
  To evaluate the impact of postoperative ACE inhibitor or ARB use on the incidence of post-CTS atrial fibrillation.
  
  
  METHODS
  We performed a retrospective cohort study of propensity score matched patients who underwent CTS at a single institution from January 2004 through December 2005. Patients who received either an ACE inhibitor or an ARB within 24 hours of surgery were propensity score matched for common predictors of post-CTS atrial fibrillation (age >70 y, preoperative digoxin use, postoperative beta-blocker or amiodarone use, beta-blocker intolerance, valve surgery, male sex, and history of diabetes mellitus, smoking, chronic obstructive pulmonary disease, prior cardiothoracic surgery) in a 1:1 ratio with patients who did not receive an ACE inhibitor or an ARB. Multivariate logistic regression was used to generate adjusted odds ratios to minimize the impact of baseline confounders.
  
  
  RESULTS
  A total of 1469 patients underwent CTS during the study evaluation period. Postoperatively, 188 received an ACE inhibitor or an ARB and were matched to 188 control patients. Mean +/- SD age of matched patients was 68.1 +/- 11.8 years, 66% were men, 42% underwent valve surgery, and 69% and 35% received postoperative beta-blockade and amiodarone, respectively. Patients who received an ACE inhibitor or an ARB did not experience a significant reduction in post-CTS atrial fibrillation compared with control patients (adjusted OR 0.95; 95% CI 0.57 to 1.56; p = 0.83).
  
  
  CONCLUSIONS
  In this evaluation, postoperative ACE inhibitor or ARB use was not associated with a reduction in post-CTS atrial fibrillation. A study of preoperative, longer-term ACE inhibitor and/or ARB therapy is needed to determine the benefits of that strategy.
authors.affiliation: School of Pharmacy, University of Connecticut, Storrs, CT, USA.
authors.forename: Craig I
authors.initials: CI
authors.lastname: Coleman
authors.forename: Sagar
authors.initials: S
authors.lastname: Makanji
authors.forename: Jeffrey
authors.initials: J
authors.lastname: Kluger
authors.forename: C Michael
authors.initials: CM
authors.lastname: White
mesh_terms: D000368:Aged; D000369:Aged, 80 and over; D047228:Angiotensin II Type 1 Receptor Blockers / Q000627:therapeutic use*; D000806:Angiotensin-Converting Enzyme Inhibitors / Q000627:therapeutic use*; D001281:Atrial Fibrillation / Q000453:epidemiology / Q000517:prevention & control*; D001713:Biphenyl Compounds / Q000627:therapeutic use; D006348:Cardiac Surgical Procedures / Q000009:adverse effects; D015331:Cohort Studies; D005260:Female; D006801:Humans; D000077405:Irbesartan; D017706:Lisinopril / Q000627:therapeutic use; D008297:Male; D011183:Postoperative Complications / Q000453:epidemiology / Q000517:prevention & control*; D017257:Ramipril / Q000627:therapeutic use; D012189:Retrospective Studies; D013777:Tetrazoles / Q000627:therapeutic use; D014633:Valine / Q000031:analogs & derivatives / Q000627:therapeutic use; D000068756:Valsartan
chemical_list: D047228:Angiotensin II Type 1 Receptor Blockers; D000806:Angiotensin-Converting Enzyme Inhibitors; D001713:Biphenyl Compounds; D013777:Tetrazoles; D000068756:Valsartan; D017706:Lisinopril; D014633:Valine; D000077405:Irbesartan; D017257:Ramipril