The Role of hs Troponin I and NT-proBNP in Predicting Atrial Fibrillation in Patients With Permanent Pacemakers

This study is investigating whether two blood markers — high-sensitivity troponin I (a heart stress marker) and NT-proBNP (a heart failure marker) — can predict which patients undergoing lung surgery will develop an irregular heartbeat called atrial fibrillation afterward, which is a common and serious complication. **You may be eligible if...** - You are an adult scheduled for lung surgery (such as for lung cancer) - You do not already have a diagnosis of atrial fibrillation - You are willing to have blood tests before surgery and be monitored after **You may NOT be eligible if...** - You already have atrial fibrillation or significant heart arrhythmias - You have end-stage kidney disease or other conditions that significantly affect these biomarker levels - You are unable to consent to participation Talk to your doctor to see if this trial is right for you.