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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.
Quadruple Bypass Surgery. For some patients, the blockage(s) are so severe that surgery is necessary to make sure the heart continues to receive adequate blood flow. This procedure is known as coronary artery bypass graft surgery (CABG), or heart bypass surgery.