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  • Title: Autopsy study of small cardiac scars in Japanese men who lived in Hiroshima, Japan and Honolulu, Hawaii.
    Author: Steer A, Lee SS, Stemmermann GN, Yamamoto T, Rhoads GG, Lee KK.
    Journal: Lab Invest; 1979 Dec; 41(6):538-45. PubMed ID: 513645.
    Abstract:
    Japanese men long resident in Honolulu, Hawaii have significantly more ischemic heart disease but significantly fewer small cardiac scars than men in Hiroshima, Japan. These scars occur in three forms:(1)small scars in the mural myocardium which account for the difference in frequency of small lesions in the two cities and are of uncertain etiology; (2)areas of diffuse fibrosis in the papillary muscles. These are equally frequent in the two cities and are associated with advancing age and sclerosis of papillary muscle arteries; and(3)focal scars in the papillary muscles. These are more frequent in Honolulu than Hiroshima. They are healed infarcts due to ischemic heart disease and are associated with a severe degree of extramural coronary artery atherosclerosis. Small mural myocardial scars, when present, are usually found in multiple sites. Their increased frequency in Hiroshima is not explained by differences in age or heart weight. They are more common in the presence of sclerosis of intramural small arteries, but this association also fails to explain the intercity difference. It is supected that the excess of these small cardiac scars in Hiroshima males reflects past privation. There is no evidence that is is related to A-bomb radiation exposure.
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