Every year in the United States, about 270,000 patients undergo coronary artery bypass grafting (CABG) to reroute blood around blockages in the arteries feeding
their heart muscle.
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When a single bypass is performed, the gold standard is to attach the left internal thoracic artery (LITA), which runs inside the chest wall, to the left anterior descending artery, the most important coronary artery. But when more than one bypass graft is needed, most surgeons use a saphenous vein from the leg.
A recent study found that using the radial artery from the arm produced a superior, longer-lasting result.
“When radial artery grafts were used, the bypasses stayed open longer, and patients were significantly less likely to suffer a heart attack or need another revascularization than when the saphenous vein was used,” says heart surgeon Faisal Bakaeen, MD.
Why veins are a poor choice
Stripped from the leg, the saphenous vein makes a long, clean, pliable conduit. But veins aren’t designed to carry blood under pressure. Their walls don’t expand and contract. About 6 to 8% of saphenous veins clog before the patient leaves the hospital. By one year, 10% are diseased or occluded. Obstructed veins can trigger chest pain or heart attack — events CABG is performed to prevent.
The disease process accelerates in saphenous vein grafts between five and 10 years after CABG, requiring the majority of patients to have another revascularization procedure to prevent a heart attack.
So why do surgeons choose the saphenous vein rather than the radial artery in 90% of cases?
Surgeons want to perform an expeditious and safe operation that gets their patients out of the hospital fast. Long-term outcomes are not tracked. Until now, there has been little incentive to use multiple arterial grafts. It makes the procedure more technically difficult and longer and increases the risk of infection at the surgical site.
Why arteries are better
Arteries carry oxygenated blood away from the heart under high pressure. Their walls are flexible, which allows them to accommodate changes in blood flow. It’s this innate flexibility that enables artery grafts to remain free of atherosclerosis indefinitely.
In the meta-analysis of 1,036 patients, use of a radial artery as a second bypass conduit reduced the combination of death, heart attack and revascularization by
33% over saphenous vein grafts. Revascularizations fell by 50% and heart attacks by about 30%. Complications were especially low in patients younger than age 75, in women and in patients with good kidney function.
Survival rates differ
The study examined only outcomes up to five years after CABG. At this point, no difference was seen in survival rates with either the vein or artery graft. But other studies have confirmed that a second arterial graft significantly increases the likelihood the patient will be alive 10 years after CABG. Cleveland Clinic and other major heart centers follow Society of Thoracic Surgery guidelines and use an artery as a second conduit whenever possible.
What this means for you
A larger international study of artery versus vein grafts is underway. When this study of 4,300 patients wraps up in 2028, Dr. Bakaeen expects the reputation of the radial artery to be cemented. But even now, evidence points to saphenous vein grafts as being an inferior choice.
“Patients undergoing elective CABG might want to ask their surgeon what grafts will be used,” Dr. Bakaeen says. “If the answer is saphenous veins, they might want to seek a surgeon with experience using the radial artery. The decision could impact the likelihood of having complications after surgery, as well as surviving 10 years or longer.”
This article originally appeared in Cleveland Clinic Heart Advisor.