Abnormally high potassium concentration in the blood, most often due to defective renal excretion; characterized clinically by electrocardiographic abnormalities; in severe cases, weakness and flaccid paralysis may occur.

Hyperkalemia is an elevated level of potassium (K+) in the blood. Normal potassium levels are between 3.5 and 5.0 mmol/L (3.5 and 5.0 mEq/L) with levels above 5.5 mmol/L defined as hyperkalemia...