[1]Department of Cardiology the Second Clinical Medical College Shanxi Medical University Taiyuan 030001 Shaanxi Province China;
[2]Department of Cardiology Second Hospital of Shanxi Medical University Taiyuan 030001 Shaanxi Province China;
Atrial fibrillation; Angiotensin 2; Angiotensin-converting enzyme 2; Angiotensin-(1-7);