Some people who take aspirin to protect against heart disease are resistant to the medication's benefits. These people have a higher risk of dying from heart disease, said researchers in a study reported in a March 25 rapid-access publication of Circulation.
In the study, researchers at the University of Western Australia, Royal Perth Hospital, found that patients taking aspirin who had a high level of thromboxane in their urine had a 3.5 times higher risk of cardiovascular death than patients who had the lowest level.
Mitka M. . . . But Aspirin May Not Help. JAMA. 2002;287(16):2067. doi:10.1001/jama.287.16.2067-JQU20004-4-1