Effect of Left Posterior Pericardiotomy for the Prevention of POAF

This study is planned to evaluate the effect of left posterior pericardiotomy for the prevention of postoperative atrial fibrillation after coronary artery bypass grafting. Eligible patients will be randomized to be created or not to be created the left posterior pericardiotomy at the end of the operation, and the incidence of postoperative atrial fibrillation will be compared.

Inclusion Criteria: * patients who are planned to undergo coronary artery bypass grafting * patients aged ≥19 years Exclusion Criteria: * patients who are planned to undergo other concomitant cardiac procedures (e.g. valve procedures, aorta procedures) * patients who undergo coronary artery bypass grafting using cardiopulmonary bypass * patients who are documented with paroxysmal, persistent, or permanent atrial fibrillation before operation * patients who have a history of cardiac surgery * patients who have a history of pericardial disease * patients who have severe adhesion at left pleural cavity which precludes effective left posterior pericardiostomy * patients who refuse to participate in this study