WATERLOO (KWWL) -- Nearly 200,000 people in the U.S. have a heart attack each year -- and never even know it.
So-called "silent" heart attacks don't cause any pain or major discomfort, and aren't always detected on standard E.C.G. tests.
Duke University researchers used a different type of imaging to try to find evidence of silent heart attacks in 185 patients suspected of having coronary artery disease. None had been diagnosed with heart attacks, but researchers say they found signs of a previous, undetected heart attack in 35% of the patients.
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