Gestalt syndrome is also known as bed catching and gestalt sign. It is most often seen in delirium with severe illness, such as typhoid, typhus, epidemic B encephalitis, severe pneumonia, hepatic coma and other toxemia, alcohol intoxication, and after overdose of sedatives and atropine intoxication. A previous history of chronic liver disease with impaired consciousness and touch-empty syndrome should be considered hepatic coma. Then we should consider a series of tests for hepatic coma. The relevant tests for touch vacancy syndrome are as follows: 1. Abnormal liver function: abnormal coagulation function often reflects only the functional state of hepatocytes, such as enzyme jaundice separation, hyperbilirubin, hypohemoglobinemia, reduced cholinesterase activity and reduced serum cholesterol, all of which do not indicate the severity of hepatic encephalopathy, blood biochemical tests such as the occurrence of water, electrolyte and acid-base balance disorders can promote and aggravate hepatic encephalopathy, renal function (creatinine. Urea nitrogen) tests such as abnormalities only indicate the imminent or already occurred renal failure, in recent years, some people believe that dynamic observation of serum melatonin levels for the prediction, diagnosis of the occurrence of hepatic encephalopathy and determine the changes in the condition has an important reference value. 2, blood ammonia measurement: about 75% of HE patients blood ammonia concentration is increased to varying degrees, in chronic patients increased more, acute patients increased less, but elevated blood ammonia, does not necessarily appear hepatic encephalopathy, so elevated blood ammonia concentration, the diagnosis has a certain reference significance, to guide the treatment also has reference significance, such as the determination of arterial blood ammonia concentration increased than venous blood ammonia is more meaningful. 3.Plasma amino acid measurement: If the concentration of branched chain amino acids decreases, the concentration of aromatic amino acids (especially tryptophan) increases, and the inverse ratio of the two is <1, which is more obvious in the chronic type, and GABA can be measured at the same time is often increased. 4, EEG examination: EEG changes have certain significance for the diagnosis and prognosis of the disease, the normal EEG wave amplitude is low, the frequency is fast, the wave pattern is alpha wave, with the change and development of the disease, the frequency slows down, the wave amplitude gradually increases, the wave pattern changes from alpha wave to theta wave 4-7 times per second is suggestive of pre-consciousness, such as becoming symmetrical, high amplitude, δ wave 1.5-3 times per second is the coma phase performance, for suspicious The EEG changes in suspected EEG can be clarified by the intensification of EEG changes after high protein intake and small doses of morphine injection, and the EEG changes in hepatic encephalopathy can also be seen in uremia, pulmonary failure and hypoglycemia, which should be distinguished.