Study shows aspirin's limits as heart medicine

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 Tuesday 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 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, in a telephone interview. "We've not cracked that. This was an opportunity to pick people who are at increased risk and try to target a new population to try to prevent getting a heart attack or stroke."

Research is needed to see whether Lipitor and Crestor, two cholesterol-lowering drugs called statins, work in these patients to reduce their risk of heart attack or stroke, Fowkes said.