Coronary bypass surgery is performed in a person who has a lesion in one or more coronary arteries in critical position and larger than 66%. In this surgery we connect blood vessels taken from other parts of the body, proximal and distal to the lesion so that blood supply is delivered beyond the lesion.
The bypass surgery can be performed by connecting the patient to the heart lung machine or without the help of heart lung machine.
By pass surgery has fewer complications than angioplasty and has longer term benefit than angioplasty.