The RCA, also known as the right coronary artery, opens in the right coronary sinus and is distributed in a C-shape, supplying mainly the right ventricle and the septal myocardium of the lower wall part of the heart. The right coronary artery mainly divides into the following branches: First, the posterior septal branch, which is the terminal branch of the right coronary artery. Second, the interatrial branch, which starts from the right coronary artery and goes deeper to the atrioventricular node. Third, the right marginal branch, which is thicker and runs left along the inferior border of the heart to the apical region. Fourth, the conical branch of the artery, which is located in the cone of the artery and has the same name as the left coronary artery, is the first branch of the right coronary artery and sometimes opens independently in the right coronary sinus, mainly supplying blood to the right atrium and sinus node. In acute occlusion of the right coronary artery, the ECG will show II, III, and AVF leads, ST-segment arch-dorsal elevation, and pathological Q waves, which is clinically referred to as acute inferior wall myocardial infarction.