PHILADELPHIA — People with severe but stable heart disease from clogged arteries may have less chest pain if they get a procedure to improve blood flow rather than just giving medicines a chance to help, but it won’t cut their risk of having a heart attack or dying over the following few years, a big federally funded study found.
For non-emergency cases, the study shows “there’s no need to rush” into invasive tests and procedures, said New York University’s Dr. Judith Hochman. About 17 million Americans have clogged arteries that crimp the heart’s blood supply, which can cause periodic chest pain. Cheap and generic aspirin, cholesterol-lowering drugs and blood pressure medicines are known to cut the risk of a heart attack for these folks, but many doctors also recommend a procedure to improve blood flow.
All 5,179 participants had stress tests, usually done on a treadmill, that suggested blood flow was crimped. All were given lifestyle advice and medicines that improve heart health. Half also were given CT scans to rule out dangerous blockages, then continued on their medicines. If stents and bypasses did not carry risks of their own, “I think the results would have shown an overall benefit” from them, said another study leader, Dr. David Maron of Stanford University. “But that’s not what we found. We found an early harm and later benefit, and they canceled each other out.”Bypasses and stents fix only a small area. Medicines affect all the arteries, including other spots that might be starting to clog, experts said.