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American Journal of Clinical Nutrition, Vol 53, 215S-222S, Copyright © 1991 by The American Society for Clinical Nutrition, Inc

REVIEW ARTICLES

Role of oxygen free radicals in ischemic and reperfused myocardium

R Ferrari, C Ceconi, S Curello, A Cargnoni, E Pasini, F De Giuli and A Albertini
Cattedra di Cardiologia e Cattedra di Chimica, Universita di Brescia, Italy.

In recent years there has been considerable interest concerning the role of oxygen radicals in myocardial ischemia and reperfusion injury. The sequential univalent reduction of oxygen gives rise to very reactive intermediate products. Normally, the tissue concentration of these intermediate products of oxygen is limited and the aerobic myocardium survives because of the existence of a delicate balance between the generation of the various oxidants and the maintenance of the antioxidant defense mechanism. Several possible sources have been identified for the production of active oxygen species after ischemia and reperfusion and these sources may be mutually interactive. The ability of scavengers of oxygen free radicals, including vitamin E, to improve mechanical, mitochondrial, and sarcoplasmic reticulum function in animal models of ischemic-reperfusion injury also suggests that oxygen free radicals are partly responsible for myocardial damage in these models, although caution in the interpretation of these data is necessary.


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