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. 1978 Jul;92(1):187–214.

Relation between high energy phosphate and lethal injury in myocardial ischemia in the dog.

R B Jennings, H K Hawkins, J E Lowe, M L Hill, S Klotman, K A Reimer
PMCID: PMC2018580  PMID: 686146

Abstract

The relationship between progressive depletion of high energy phosphate and the onset of lethal cell injury in ischemic myocardium following coronary occlusion has been evaluated. Myocardial ischemia was induced by proximal occlusion of the circumflex coronary artery for 15, 30, 40, or 60 minutes. Cell injury in the severely ischemic posterior papillary muscle (PP) was evaluated by electron microscopy and by measuring the capacity of slices of the injured PP to maintain electrolytes, resynthesize high energy phosphate, and exclude inulin during in vitro incubation. ATP content in the ischemic myocardium decreased to 35%, 9%, 7%, and 5% of control values after 15, 30, 40, and 60 minutes of ischemia, respectively, and was associated with a corresponding depletion of total adenine nucleotides. The loss of 65% of the ATP after 15 minutes of ischemia (reversible injury) was associated with only minimal ultrastructural changes and no significant defects of electrolytes in incubated slices. However, the depletion of over 90% of the ATP after 40 minutes of ischemia (irreversible injury) was associated with significant fine structural changes and markedly altered cell volume regulation. The results suggest a close relationship between the marked depletion of high energy phsophates and the development of lethal injury in acutely ischemic myocardium.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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