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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.
If you have a blood clot, your doctor may remove it during your angiogram. Mesenteric artery bypass. A bypass creates an alternate route for blood to flow around the narrowed or blocked artery. Your surgeon sews a substitute blood vessel (graft) to a main artery to restore blood flow.