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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.
What Is Coronary Artery Bypass Graft (CABG) Surgery? Coronary artery bypass graft surgery (heart bypass surgery) is a major surgery that improves blood flow to your heart muscle. CABG surgery creates a new route for blood to flow around a blocked coronary artery.