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In this patient, the right coronary artery (RCA) is filled with contrast agent. By a natural bypass, that is, the collateral channel (arrows), the left coronary artery (LAD), which is blocked at its origin (ring), is filled with blood.
Coronary artery bypass grafting (CABG) is a type of surgery that uses arteries or veins from other areas in your body to bypass your narrowed coronary arteries. CABG can improve blood flow to your heart, relieve chest pain, and possibly prevent heart attack.