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Hyperkalemia manifestations - answer-Muscle weakness, paresthesia, paralysis, cardiac rhythm irregularities (leading to possible ventricular fibrillation and cardiac arrest) How can hyperkalemia lead to cardiac arrest? - answer-A major function of potassium is to conduct nerve impulses in muscles. Too low and muscle weakness occurs and too much can cause muscle spasms. This is especially dangerous in the heart muscle and an irregular heartbeat can cause a heart attack Pres...