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Coronary artery bypass graft surgery (CABG) is used to treat coronary artery disease; the blocked artery is ‘bypassed’ by sewing (grafting) another blood vessel to the aorta at one end and to the coronary artery beyond the damaged area the other end. After the operation, blood flows through the new grafted vessel to the heart muscle. The vessel used for the bypass is removed (harvested) from the leg (saphenous vein graft), chest or arm.