It is known that the plasma level of thrombin-antithrombin-III complex (TAT) is significantly increased in patients with valvular heart diseases including mitral stenosis [32] and aortic stenosis [33], atrial fibrillation [34], and idiopathic cardiomyopathy [35], implying a state of increased coagulability in these heart diseases. This evidence concerns the gene SERPINC1 and aortic stenosis.