Calcitonin Level and New-onset of Post-Operative Atrial Fibrillation

Exclusion Criteria

• •1\. Atrial fibrillation/flutter;
• •2\. Left atrial diameter \>5.5cm;
• •3\. Previous cardiac surgery or emergency surgery (\<12h);
• •4\. Sick sinus node syndrome;
• •5\. Ventricular preexcitation or preexcitation syndrome;
• •6\. Second degree or above atrioventricular block;
• •7.Myocardial infarction occurred within 7 days;
• •8\. Infection, sepsis, rheumatic or inflammatory diseases;
• •9\. Abnormal liver and kidney function (three times higher than the upper limit of normal);
• •10\. Uncontrolled hyperthyroidism, severe obstructive sleep apnea, and acute alcoholism;
• •11\. Any ischemic events (stroke or TIA) that occurred 180 days before the participant signed the informed consent, or any known unresolved complications from previous stroke/TIA;Thrombosis;
• •12\. Patients with other diseases requiring radiotherapy, chemotherapy and long-term hormone therapy;
• •13\. Patients' life expectancy makes it unlikely that follow-up will be completed;
• •14\. Participate in, or are expected to participate in, other clinical trials of any drugs, devices or biologics during the study period;
• •15\. Patients with contraindications to dynamic electrocardiogram;
• •16\. Patients who are unwilling or unable to fully comply with study procedures and follow-up.