本文采用经颅多普勒超声(TCD)连续监测2例Shy—Drager综合征病人不同体位和不同呼吸状态下的脑动脉血液流速变化。现报告如下: 病例1 男,43岁。1987年起直立位感头晕、眼花,突然起立时双膝常发软跪地,偶伴晕厥,平卧后症状迅速消失。伴阳萎、无汗。体检:满头白发,角膜老年色素环,神经系统无阳性体征。右臂血压卧位22.0～13.3/14.0～8.0kPa,立位17.3～6.7/10.7～4.0kPa。心率卧位56～66次/分,立位66～72次/分。 In this paper, transcranial Doppler ultrasound (TCD) was used to continuously monitor the changes of cerebral blood flow velocity in two groups of Shy-Drager syndromes at different positions and in different respiratory states. The report is as follows: Case 1 Male, 43 years old. Erect since 1987, dizziness, vertigo, suddenly stood up knees, accompanied by occasional syncope, the symptoms disappeared after supine. With impotence, no sweat. Physical examination: white hair, corneal senile pigment ring, nervous system no positive signs. Right arm blood pressure lying position 22.0 ~ 13.3 / 14.0 ~ 8.0kPa, standing 17.3 ~ 6.7 / 10.7 ~ 4.0kPa. HR position 56 ~ 66 times / min, standing 66 ~ 72 beats / min.