Hyperkalemia is an increase in the level of potassium in the blood serum above 5.5 mmol / l or mEq / l. The reason is an increased intake of potassium in the body, its release from cells or a slowdown in excretion. The main clinical symptoms include general muscle weakness, severe cardiac arrhythmias. Diagnosis is made by measuring the concentration of potassium in the blood. As measures of treatment, potassium intake is maximally limited, some drugs are canceled, calcium, glucose, and insulin preparations are used. In severe hyperkalemia, hemodialysis is performed.