Compare the decline in blood flow velocities and its recovery time before and after Trousseau's test in vertebral waveform with or without notch at systole. 通过对椎动脉收缩期切迹组与无切迹组做束臂试验,比较束臂前后收缩期血流速度下降幅度及流速自下降至恢复的时间。
Objectives: To diagnose early subclavian steal syndrome using Transcranial Doppler ( TCD) combined with Trousseau's test. 目的:应用经颅多普勒超声(TCD)及束臂试验证实椎动脉收缩期切迹可提示早期锁骨下动脉盗血综合征(SSS)。