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 .
Silent heart attacks affect nearly 200,000 people in the United States annually . Researchers studied 185 people at risk of coronary artery disease . Treatment for `` silent '' heart attacks is similar to that for regular attacks . More research is necessary to determine whether screening is useful .