Silent heart attacks affect nearly 200 people in the United States annually . Researchers studied 185 people at risk of coronary heart disease . Testing for ` ` silent '' heart attacks is similar to that for regular attacks . Researchers used a relatively new technique called delayed-enhancement cardiovascular magnetic resonance and then followed up with patients after about two years . More research is necessary to determine whether this is useful .
Silent heart attacks affect nearly 200 people in the United States annually . Researchers studied 185 people at risk of coronary heart disease . Testing for ` ` silent '' heart attacks is similar to that for regular attacks . More research is necessary to determine whether this is useful .