Pericarditis: This is a common complication following AF ablation, especially if the procedure involved extensive ablation or if there was a perforation. The mild troponin elevation can be seen in pericarditis due to epicardial involvement. Chest pain post-procedure, often described as sharp and improving with sitting up and leaning forward, is characteristic.

Myocardial Infarction (MI) due to Stent Thrombosis or Dissection: Although less common, MI can occur post-ablation due to mechanical complications such as stent thrombosis or dissection if a stent was placed during the procedure, or due to coronary spasm.
Pulmonary Vein Stenosis: This is a known complication of AF ablation, where the pulmonary veins are inadvertently narrowed during the procedure, leading to chest pain and potentially other symptoms like dyspnea.
Atrial Esophageal Fistula: Although rare, this is a serious complication that can present with chest pain, and the mild troponin elevation could be secondary to the inflammatory response.

Pulmonary Embolism (PE): Given the recent procedure and potential for immobility, PE is a critical diagnosis not to miss. Chest pain and mild troponin elevation can be seen in PE, especially if there is right ventricular strain.
Aortic Dissection: This is a life-threatening condition that can present with chest pain and is a known, though rare, complication of catheter-based procedures due to the manipulation of catheters near the aortic root.
Cardiac Tamponade: Post-procedural bleeding can lead to tamponade, which presents with chest pain, hypotension, and potentially elevated troponins due to myocardial compression.

Esophageal Perforation: Similar to atrial-esophageal fistula but without the fistulous connection to the atrium. It's a rare but serious complication of AF ablation.
Pneumothorax: Although more commonly associated with procedures involving lung biopsy or line placement, pneumothorax can occur post-ablation, especially if there was accidental puncture of the lung during the procedure.