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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.
Heart bypass surgery, also known as coronary artery bypass surgery, aims to replace damaged arteries in the heart. A surgeon uses blood vessels from another area of the body to repair the damaged arteries. This surgery is used when the coronary arteries become blocked or damaged.