Coronary artery bypass surgery, often simply referred to as bypass surgery or CABG , is a surgical procedure used to treat the coronary artery disease (CAD). CAD is a condition where the blood vessels that supply oxygen and nutrients to the heart muscle become narrow or block due to the build up of fatty deposits . This narrowing or blockage can lead to reduced the blood flow to the heart, which can cause a chest pain (angina) or increase the risk of  heart attack. But coronary artery bypass surgery is generally highly effective at improving blood flow to the heart and relieving symptoms of CAD

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