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Heart beat: Calcium scan benefit still uncertain
Calcium scan benefit still uncertain
Using a special CT scan to measure calcium deposits in the arteries that nourish the heart has been promoted as a way to predict the chances of having a heart attack. In theory, this makes sense. Since calcium is part of the buildup of cholesterol-filled plaque in artery walls, measuring it might be one way to foresee the heart's future. But concerns that this approach might not work for people of all ethnicities and doubts about its cost-effectiveness have dogged the test.
The results of a four-year study of 6,700 white, black, Hispanic, and Chinese volunteers put the ethnicity concern to rest. In each group, people with higher calcium scores were more likely to have had a heart attack or to have died from heart disease compared with those with low scores (New England Journal of Medicine, March 27, 2008). The results don't answer the question of how much extra information the $500 test adds to the free and easily calculated Framingham risk score. Health insurers don't routinely cover the cost of coronary calcium scanning.
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