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Cardiac screening test may help determine who should take aspirin to prevent heart attack
Date:5/9/2014

included had no known CVD or diabetes, were not on aspirin therapy, and were followed for approximately 7 years.

Participants were grouped according to their CAC score and the rates of heart attacks in each group were calculated. Based on these rates, the research team weighed the likelihood of an individual to benefit from aspirin therapy (the potential of the aspirin to prevent a heart attack) against the likelihood of harm (the potential for the aspirin to cause major bleeding). They estimated that participants with elevated CAC scores (>100) were 2−4 times more likely to benefit from aspirin therapy than to be harmed, even if they did not qualify for aspirin use according to current AHA guidelines. Conversely, MESA participants with no calcified plaque (CAC score = 0) were 2−4 times more likely to be harmed by aspirin use than to benefit. The results in both groups held true even after accounting for traditional risk factors.

"We estimate that individuals with significant plaque buildup in the arteries of the heart are much more likely to prevent a heart attack with aspirin use than to suffer a significant bleed" explains Miedema. "On the opposite end of the spectrum, if you don't have any calcified plaque, our estimations indicate that use of aspirin would result in more harm than good, even if you have risk factors for heart disease such as high cholesterol or a family history of the disease."

Miedema added, "A CAC score of zero is associated with a very low risk of having a heart attack. That means individuals with a score of zero may not benefit from preventive medications, such as aspirin as well as the cholesterol-lowering statin medications. Approximately 50% of middle-aged men and women have a CAC score of zero, so there is a potential for this test to personalize the approach to prevention and allow a significant number of patients to avoid preventive medications, but we need further research to verify that rou
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Contact: Jackie Boucher
jboucher@mhif.org
612-863-1636
Minneapolis Heart Institute Foundation
Source:Eurekalert

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