Postoperative Atrial Fibrillation in Cardiac Surgery

This observational study is looking at rates and risk factors for a common complication after heart surgery called postoperative atrial fibrillation (POAF) — an irregular heartbeat that often develops after procedures like bypass surgery or valve repair. By tracking medical records, researchers aim to better understand who is at risk and how to prevent it. **You may be eligible if...** - You are 18 or older - You are undergoing heart valve surgery or coronary artery bypass grafting (CABG) **You may NOT be eligible if...** - You are having aortic (main blood vessel) surgery - You are having a MAZE procedure (a surgical treatment specifically for AF) - Your medical records are incomplete - You required a mechanical heart device during or after surgery Talk to your doctor to see if this trial is right for you.