Effect of Left Posterior Pericardiotomy for the Prevention of POAF

This study is testing whether a surgical technique called left posterior pericardiotomy — a small incision in the sac around the heart made during bypass surgery — can prevent a common complication called postoperative atrial fibrillation (POAF), which is an irregular heartbeat that can occur after heart surgery. **You may be eligible if...** - You are 19 years or older - You are scheduled to undergo coronary artery bypass grafting (heart bypass surgery) **You may NOT be eligible if...** - You are scheduled to have additional heart procedures at the same time (such as valve repair or aorta surgery) - You are having emergency bypass surgery - You are outside the eligible age range - You have conditions that would make the additional surgical step risky Talk to your doctor to see if this trial is right for you.