Potassium ion is the most abundant cation in intracellular fluid, which is mainly bound and directly involved in intracellular metabolic activities; Appropriate potassium concentration and its ratio on both sides of cell membrane play an important role in maintaining the generation of resting potential and the generation and conduction of electrical excitation in nerve muscle tissue; It also directly affects the regulation of acid-base balance. Potassium ion disorder is one of the most common electrolyte disorders in clinic, and often exists at the same time with other electrolyte disorders. Blood potassium higher than 5.5mmol/l is called hyperkalemia, and > 7.0mmol/l is severe hyperkalemia. Hyperkalemia has two types: acute and chronic. The acute patient is an emergency and should be rescued in time, otherwise it may lead to cardiac arrest.
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