Hyperkalemia is a serious clinical condition, mainly due to the presence of normal electrolytes in the body, of which potassium is an important ion, and should be within a reasonable range, normally 3.5-5.5 mmol/L. If there is an electrolyte disorder, potassium above 5.5 mmol/L is considered hyperkalemia, and if it is higher than 7.0 mmol/L, it is considered severe hyperkalemia. Hyperkalemia. The main cause of hyperkalemia is due to renal disease, because most of the potassium is excreted from the urine, but if in oliguria or severe renal failure, not enough potassium can be excreted, hyperkalemia will occur. The use of medications can also cause an increase in blood potassium, such as potassium-sparing diuretics, spironolactone, amphotericin, and other drugs, as well as excessive potassium input and release of intracellular potassium, including inflammatory tissue damage, shock, and other conditions that can bring about an increase in blood potassium. The increase in potassium is mainly due to damage to the cardiovascular system and musculoskeletal nerves. The effect on the heart is that the myocardium is severely inhibited, the heartbeat becomes slow, and cardiac arrhythmias are likely to occur. Therefore, patients with hyperkalemia tend to have a slow heartbeat and prolonged QT interval, while the effects on the neuromuscular system are mainly manifested as muscle fatigue, soreness, numbness, and in severe cases of hyperkalemia, cardiac arrest may occur and become life-threatening.