Cerebral blood flow velocity in the right middle cerebral artery was measured by transcranial Doppler sonography before HDT (supine), on days 1, 3 and 4 of HDT and on day 2 post HDT.

• 卧床前和卧床4d结束时在倾斜床上进行2次立位耐力检查,卧床前(卧位)、卧床第1、3、4天及起床后第2天用经颅多普勒超声仪测量右侧大脑中动脉血流速度。