The normal values for serum potassium are 3.5-5.5 mmol/L, for serum sodium 135-145 mmol/L, for serum chloride 96-108 mmol/L and for serum calcium 2.25-2.59 mmol/L. The body’s electrolytes are susceptible to many factors. The body is susceptible to blood potassium abnormalities in patients with prolonged fasting or insufficient potassium intake as well as prolonged diarrhea, vomiting, after gastrointestinal drainage, aldosteronism and acute renal failure. In addition heart patients in emergencies, cirrhotic patients with ascites, and patients with acute pancreatitis and cholecystitis are prone to hypokalemia. When patients show symptoms of hypokalemia, they should immediately replenish potassium, otherwise the patient’s life will be endangered.