Study examines prevalence of 'silent' heart attacks in population

(The JAMA Network Journals) In a multiethnic, middle-aged and older study population, the prevalence of myocardial scars (evidence of a heart attack) was nearly 8 percent, of which nearly 80 percent were unrecognized by electrocardiography or clinical evaluation, according to a study in the Nov. 10 issue of JAMA.