 The aim of the study is to investigate whether the expression and production of four adipokines adiponectin, omenin-1, resistin and retinol binding protein-4 RBP4 secreted by the epicardial adipose tissue correlate with the degree of coronary atherosclerosis. Specifically, this study aims to investigate whether the expression and production of these adipokines is different between two sites of the heart, that are perfused by coronary arteries with different degrees of stenosis. 