Hello, there are potassium ions in the blood, potassium ions can participate in many physiological functions of the human body, but not the more the better. When the potassium ion in human blood exceeds 5.5 mmol/L, hyperkalemia can be diagnosed. > 7.0 mmol/L was severe hyperkalemia. Hyperkalemia can be classified as acute and chronic. Acute patients are acute and should be rescued in time. Otherwise, it may lead to sudden cardiac arrest. Therefore, blood potassium needs to be maintained at normal levels, too high or too low will cause serious harm to the human body.