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国外一直将肝性脑病列为急、慢性肝衰竭的必备条件。尽管部分学者提出将凝血酶原活动度（PTA）在40％以下的非脑病型肝功能不全者列为肝衰竭前期,但大多数学者仍同意只有出现脑病者才可诊断肝衰竭。目前认为,急性肝衰竭（AHF）与肝硬化所致肝性脑病在病理学上及肝性脑病形式均不一样,前者脑水肿更为突出[1]。暴发性肝衰竭（FHF）既可发生于急性肝炎,亦可发生于慢性肝炎。现将有关重症肝炎/肝衰竭脑病包括肝性脑病和脑水肿防治研究进展综述如下。一、肝性脑病的防治1.传统方法:低蛋白饮食、清洁肠
Foreign countries have been listed as acute hepatic encephalopathy, a prerequisite for chronic liver failure. Although some scholars have proposed that non-encephalopathy of liver dysfunction with prothrombin activity (PTA) below 40% be classified as pre-hepatic failure, most scholars still agree that only patients with encephalopathy should be diagnosed with liver failure. Currently, acute hepatic failure (AHF) and hepatic cirrhosis caused by hepatic encephalopathy in both pathology and hepatic encephalopathy are not the same form, the former cerebral edema is more prominent [1]. Fulminant hepatic failure (FHF) can occur both in acute hepatitis and in chronic hepatitis. The following is a summary of the research progress on the prevention and treatment of severe hepatitis / liver failure encephalopathy including hepatic encephalopathy and cerebral edema. First, the prevention and treatment of hepatic encephalopathy 1. Traditional methods: low-protein diet, clean intestine