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American Journal of Pathology, Vol 81, 179-198, Copyright © 1975 by American Society for Investigative Pathology
REGULAR ARTICLES |
RB Jennings, CE Ganote and KA Reimer
The subendocardial to subepicardial gradient in the severity of ischemia following acute coronary occlusion is described. The effects of mild, moderate, and severe ischemia on cell structure and function are compared in summary form, and special attention is given to the effects of severe ischemia on myocardial cells. The characteristics of reversible and irreversible ischemic injury are defined in biologic terms. The failure of cell volume regulation in cells which have entered an irreversible state of ischemic injury is demonstrated by the use of free-hand slices in vitro. Irreversibility is associated with structural defects in the plasma membrane and is reflected in an increased slice inulin-diffusible space, increased slice H2O and Na+ content, and failure of the tissue to maintain the high K+ and Mg2+ levels characteristic of normal left ventricular myocardium. Defective cell membrane function is an early feature of irreversible ischemic injury and may be a primary event in the genesis of the irreversible state.
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