Research shows aspirin won't prevent heart attack

Aspirin doesn't prevent heart attacks or strokes in people who have a high risk of heart disease yet show no symptoms, a study in Scotland found.

Half of the 3,350 people in the study were given low-dose aspirin after a screening test showed they had a higher-than-average risk for heart disease. They had a similar number of heart attacks and strokes to the other half of participants taking a placebo, researchers reported in the Journal of the American Medical Association.

The study is the first to look at an apparently healthy population, screen them for their heart disease risk using a test that detects artery blockages in their legs and then try to reduce that with aspirin, lead author F. Gerald Fowkes said. Aspirin has been shown to lower heart attacks in people who have symptoms of heart disease, and more studies are needed to find a way to prevent cardiovascular problems in people who have a high risk and no symptoms, he said.

"One of the problems we have with coronary heart disease and stroke is we're still not that good at preventing it in people who are supposedly healthy," said Fowkes, a professor of epidemiology at the University of Edinburgh.

Research is needed to see if Pfizer Inc.'s Lipitor and AstraZeneca Plc's Crestor, two cholesterol-lowering drugs called statins, work in these patients to reduce their risk of heart attack or stroke, Fowkes said. Another approach is to test whether Bristol Myers Squibb Co.'s Plavix, an anti-clotting drug, works in this group.

More than 81 million people in the U.S. have one or more forms of cardiovascular disease, including coronary artery disease, high blood pressure and chest pain, according to the American Heart Association. It is the leading cause of death in the U.S.

Cardiovascular disease is caused by blood vessels that become narrowed or blocked. Symptoms can include chest pain, shortness of breath or pain or numbness in the legs or arms, according to the Mayo Clinic. Some people with heart disease have no signs.

Aspirin helps prevent clots from forming in the arteries and has been shown to be effective in people who have symptoms of heart disease, said Jeffrey Berger, an assistant professor of medicine and surgery at New York University, who wrote an accompanying editorial in the journal.