早在1968年美国哈佛大学已拟定了脑死亡的诊断标准[1],有关脑电图的特异性改变已得到许多学者的肯定。但经颅多普勒(TCD)在脑循环衰竭的特异性改变国内报道较少。我院1994年4月～1998年7月对14例临床诊断的脑血管疾病,同时进行了TCD及脑电图监测,发现脑循环衰竭患者的脑血流均 As early as 1968 Harvard University in the United States has developed a diagnostic criteria for brain death [1], the specific changes in the electroencephalogram has been recognized by many scholars. However, transcranial Doppler (TCD) in the specific changes in cerebral circulation failure less reported in the country. Our hospital from April 1994 to July 1998 on 14 cases of clinically diagnosed cerebrovascular disease, simultaneous TCD and EEG monitoring, found that cerebral blood flow in patients with cerebral circulation failure were