Effect of Preoperative Stellate Ganglion Block on Postoperative Atrial Fibrillation After Coronary Artery Bypass Grafting

This study is testing whether a nerve block given before coronary artery bypass grafting (open-heart bypass surgery) can reduce the risk of developing an irregular heartbeat called atrial fibrillation after the surgery. The nerve block temporarily numbs the stellate ganglion, a cluster of nerves in the neck that influences heart rhythm. **You may be eligible if...** - You are over 18 years old - You are scheduled for planned (non-emergency) bypass heart surgery (CABG) - You are able to give informed consent **You may NOT be eligible if...** - You have had prior heart surgery or a prior ablation for atrial fibrillation - You are having emergency bypass surgery - You are having additional heart procedures at the same time (e.g., valve repair, aortic surgery) - You have critical preoperative conditions or severe instability Talk to your doctor to see if this trial is right for you.