Many heart attacks not recognized

http://www.eurekalert.org/pub_releases/2015-11/tjnj-sep110515.php

Public Release: 8-Nov-2015
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 November 10 issue of JAMA. This issue, a cardiovascular disease theme issue, coincides with the American Heart Association's Scientific Sessions 2015.

Ischemic heart disease is an important public health concern, but a considerable proportion of myocardial infarctions (MIs; heart attacks) are clinically unrecognized. Given the aging of the U.S. population, it is important to understand the prevalence, risk factors, and prognosis of unrecognized MI. In patients who survive a heart attack, normal contractile (having the property of contracting) tissue is replaced by noncontractile fibrosis (formation of excess fibrous connective tissue in a reparative process) (scar). Myocardial scarring leads to abnormal heart function and poor prognosis.

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