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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.
The stent is left in the artery to keep. it open and help prevent further narrowing of the. coronary artery. 4. Coronary artery bypass graft surgery (CABG) This surgery is also called a heart bypass or open heart surgery.