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Understanding Coronary Artery Bypass Surgical Treatment: A Life-Saving Procedure Coronary artery disease (CAD) continues to be one of the leading causes of death worldwide. The problem is identified by the narrowing or clog of the coronary arteries, the important blood vessels that supply oxygen-rich blood to the heart. Over time, plaque comprised of cholesterol, fat, and various other compounds develops in these arteries, lowering blood circulation