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. 1981 Feb;102(2):241–255.

Lethal Myocardial Ischemic Injury

Robert B Jennings, Keith A Reimer
PMCID: PMC1903674  PMID: 7008621

Abstract

The biologic changes occurring in severely ischemic myocytes in vivo as the affected cells pass through the phase of reversible to the phase of lethal or irreversible injury are reviewed with special emphasis on the effect of ischemia on the production and utilization of highenergy phosphate, the destruction of the adenine nucleotide pool, and the appearance of signs of damage to the plasma membrane of the sarcolemma. Evidence is presented that indicates that the events occurring in severe ischemia in vivo are essentially identical to those found in total ischemia in vitro except that the biologic changes of ischemia develop more slowly in total ischemia in vitro than in severe ischemia in vivo. The slower time course of injury, together with the uniformity of injury provided by total ischemia in vitro, may allow for more precise identification of potential lethal cellular events in ischemic injury. The production of highenergy phosphates (HEP) from anaerobic glycolysis have been estimated in both in vivo and in vitro ischemia by the measurement of lactate accumulation, and total HEP utilization has been estimated from the depletion of stores of preformed HEP. The results show that between 80% and 90% of the HEP utilized by ischemic dog left ventricle is produced by anaerobic glycolysis. The onset of irreversibility is associated with marked depletion of the HEP and adenine nucleotide pools of the tissue and the cessation of energy production via glycolysis. The cessation of anaerobic glycolysis may be caused by the low sarcoplasmic, adenosine triphosphate (ATP) concentration of the dying myocyte. In addition to the foregoing changes, irreversibly injured tissue exhibits both ultrastructural and functional evidence of disruption of the plasmalemma of the sarcolemma. The possible relationships, causal and otherwise, between severe HEP depletion and membrane damage are discussed. Both HEP depletion (ATP < 3-8% of control) and membrane damage are considered to be objective signs of the presence of irreversible myocardial ischemic injury. However, at the present time, there is no proof that these changes are causally related either to each other or to cell death in severe in vivo ischemia.

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Selected References

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