慢性重型肝炎是目前传染病中死亡率最高的疾病之一。慢性重型肝炎并发肝性脑病者的病死宰高达85％［1］。早期明确慢性重型肝炎是否合并肝性脑病对于提高其治疗效果非常重要。为此，有人采用视诱发电位来诊断亚临床型脑病［2］。也有人采用核田共振（MRI）来早期发现脑部病变［ Chronic severe hepatitis is one of the most deadly diseases in infectious diseases. Chronic severe hepatitis complicated by hepatic encephalopathy in those who die up to 85% [1]. Early clear chronic severe hepatitis is associated with hepatic encephalopathy for improving the treatment effect is very important. To this end, some people use the evoked potential to diagnose subclinical encephalopathy [2]. Some people use nuclear field resonance (MRI) to early detection of brain lesions [