Risk Factors of Atrial Fibrillation after Coronary Artery Bypass Grafting

Objective To analyze the preoperative risk factors of atrial fibrillation(AF) in patients with coronary artery disease after coronary artery bypass grafting(CABG).Methods From September 2007 to April 2008,the clinical information of 226 patients who underwent on-pump coronary artery bypass grafting(CABG)or off-pump coronary artery bypass grafting(OPCAB) was collected.The patients were divided into non-AF group and AF group according to whether AF lasted more than 5 mins in 3 days after operation.Ultrasonic cardiography(UCG) and clinical information of preoperation in two groups were analyzed.Results Twenty-four(10.6%) patients had AF after operation.There were more patients whose left atrial diameter 35 mm in AF group than that in non-AF group [41.7%(10)vs.22.3%(45),χ2=4.380,P=0.036)],more patients had mitral regurgitation in AF group than that in non-AF group [37.5%(9) vs.17.3%(35),χ2=5.568,P=0.018)],more patients had left main coronary artery involvement in AF group than that in non-AF group [33.3%(8) vs.12.4%(25),χ2=7.560,P=0.006],and patients in AF group were older than those in non-AF group [65.7±9.5 years vs.60.1±10.1 years,t=-2.724,P=0.010].In univariate analysis,in terms of preoperative clinical indexs such as the aged,mitral regurgitation,left atrial diameter,left mainm coronary artery involvement,and postoperative clinical indexs such as ventilatory time(χ2=4.190,P=0.040),electrocardiogram(ECG) monitoring time(χ2=5.948,P=0.015),hospitalization expense(χ2=4.110,P=0.043),there were significant differences between 2 groups.Conclusion Risk factors such as the aged,mitral regurgitation, left atrial diameter and left main coronary artery involvement are related to AF after CABG.Clinical index,ECG and echocardiography are helpful to predict AF,and can provide better prevention and treatment,and reduce the rate of AF.