Association between the use of renin-angiotensin system blockers and development of in-hospital atrial fibrillation in patients with ST-segment elevation myocardial infarction.

Background and Aim: Atrial fibrillation (AF) is the most common supraventricular arrhythmia following ST-segment elevation myocardial infarction (STEMI). We evaluated the association between use of previous angiotensin converting enzyme inhibitors and/or angiotensin receptor blockers (renin-angiotensin system [RAS] blockers) and started RAS blockers after MI and development of AF in patients presenting with acute STEMI.
Materials and Methods: This retrospective study enrolled 1000 patients with acute STEMI who were admitted to the coronary care unit. Patients were divided into groups according to the use of RAS blockers before MI and development of AF rates was compared. Predictors of AF were determined by multiple logistic regression analysis.
Results: Of the 1000 patients presenting with STEMI, 247 received and 753 did not receive RAS blockers. The incidence of AF was 7.9%. The incidence of AF in patients receiving RAS blockers and did not receiving RAS blockers before MI were similar (5.7% vs. 8.6% respectively, P=0.13). On the other hand, AF rate was lower in patients in whom RAS blockers were administered during MI as compared to those in whom these agents were not administered (7.2% vs. 28.6%, P<0.001). Multiple regression analysis results showed that administration of RAS blockers or statins during hospitalization and left atrial diameter were associated with development of AF in patients with acute STEMI.
Conclusions: Previous therapy with RAS blockers does not reduce the incidence of AF in STEMI. Administration of RAS blockers at the hospital may decrease the AF rate in STEMI.
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