Abstract
Ischemia reperfusion injury to skeletal muscle may be explained by a cascade of cellular and systemic events initiated by an ischemic period followed by reperfusion. During the period of ischemia there is a gradual reduction of intracellular energy stores. Adenosine triphosphate is gradually depleted despite the buffering effect of creatine phosphate which is present in large stores in muscles. As well, glycogen stores are depleted with resultant production of small amounts of energy and large accumulations of lactate. Upon reperfusion there is a reactive hyperemia, resulting in an overall increase in muscle blood flow, despite the fact that areas may continue to be underperfused. Results of this blood flow are mixed with the beneficial effects of removing metabolic by-products and supplying exogenous substrates and oxygen. However, this blood flow also causes harmful effects by washing out necessary precursors for adenine nucleotide resynthesis. Production of oxygen free radicals occurs with resultant membrane lipid peroxidation, and calcium influx occurs upon reoxygenation with resultant disruption of oxidative rephosphorylation in the mitochondria. The sequestration of white blood cells in the muscle due to up regulation of both neutrophil receptors and endothelial leukocyte adhesion molecules results in a prolongation of the reperfusion injury. This subsequently results in damage to remote organs, including lung, heart, and kidneys. The future for therapeutic interventions aimed at reducing this injury lie mostly in the ability to modulate the reperfusion effect.
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Walker, P.M. Ischemia/reperfusion injury in skeletal muscle. Annals of Vascular Surgery 5, 399–402 (1991). https://doi.org/10.1007/BF02015307
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DOI: https://doi.org/10.1007/BF02015307