Conventional bypass surgery involves the placement of lengths of vein (typically the saphenous vein from the leg) or artery (the internal mammary artery which lies on the undersurface of the chest wall, or the radial artery which is located in the forearm) to bypass the blockage in the coronary artery. One end of the length of vein is attached to the main blood vessel from the heart, the aorta, and the other end is attached to the coronary artery beyond the blocked segment; the internal mammary artery already arises from a large vessel off the aorta and so it is attached directly to the coronary artery. The internal mammary artery has been shown to stay free from obstruction more successfully than vein grafts, and so every effort is made to use this as a bypass graft with additional vein bypass grafts as necessary. The traditional operation, which has been refined over more than 60 years, involves making an incision, known as a median sternotomy, through the breast bone at the front of the chest to gain access to the heart. During the procedure the heart is “put on bypass” using a heart-lung machine to support the circulation and oxygenate the blood whilst the heart is stopped for the surgery to be performed.

More recent advances include the use of “off-pump” surgery (Off Pump Coronary Artery Bypass, OPCAB) which avoids the need for a bypass machine, as the heart does not need to be stopped for the surgery to be performed; instead it is undertaken on a beating heart. The role of minimally invasive robotic surgery for cardiac conditions is another option for some patients.

Coronary artery bypass surgery is a major operation and most patients should expect to be in hospital for up to 7 days, with full recovery taking up to three months. Driving of private motor vehicles should cease for at least four weeks post-surgery, but the DVLA does not need to be notified. Drivers with vocational Group 2 licences are subject to different restrictions, and full guidance can be found via the DVLA.