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- W50965730 abstract "Potassium is an important electrolyte in heart cells and has the greatest membrane permeability in the unexcited state. Hence it is responsible for th generation of the resting membrane potential. Clinical disorders of conduction and impulse formation occur within physiological values of serum potassium. Potassium is indirectly involved in excitation-contraction coupling, and its relation to intracellular calcium metabolism is reviewed. While potassium movements within the cell are metabolic-dependent, it is also true that the activity of metabolic pathways is affected by changes in potassium concentration. During anoxia and ischemia, sodium and calcium are gained by the myocyte, and potassium and magnesium are lost by the cell. At the same time, the action potential duration is abbreviated, the slope of the action potential downstroke (phase 2) is increased, and the resting membrane potential may be reduced. A relationship between disturbances in intracellular potassium and ischemic arrhythmias appears likely." @default.
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- W50965730 date "1976-06-01" @default.
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- W50965730 title "Potassium metabolism in the normal and ischemic heart cell." @default.
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