<unk><unk><unk>  surgery, also<unk><unk><unk>  graft (CABG, pronounced "cabbage") surgery, and colloquially heart<unk>  or<unk>  surgery is a surgical procedure performed to relieve angina and reduce the risk of death from<unk><unk>  disease.<unk> es or veins from elsewhere in the patient's body are grafted to the<unk> <unk> es to<unk>  atherosclerotic narrowings and improve the blood supply to the<unk>  circulation supplying the myocardium (heart muscle). This surgery is usually performed with the heart stopped, necessitating the usage of cardiopulmonary<unk> ; techniques are available to perform CABG on a beating heart, so-called "off-pump" surgery.
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