Kotval P S, Babu S C, Shah P M
Department of Radiology, New York Medical College, Valhalla.
J Ultrasound Med. 1990 Apr;9(4):207-13. doi: 10.7863/jum.1990.9.4.207.
Subclavian steal syndrome has been classically described as a unidirectional phenomenon in which retrograde flow occurs in the ipsilateral vertebral artery in cases of high-grade proximal subclavian stenosis. Pulsed Doppler examination in cases of subclavian stenosis shows that partial steals with to-and-fro flow do occur. A model based on fluctuating pressure gradients to explain the partial steal phenomenon is discussed. The usefulness of physiologic maneuvers such as ipsilateral arm exercise and postocclusive hyperemia in converting partial steals to full steals is demonstrated. In cases in which surgical bypass to correct partial steals is carried out, a relative steal can be demonstrated by Doppler examination before and after physiologic maneuvers.
锁骨下动脉盗血综合征传统上被描述为一种单向现象，即近端锁骨下动脉高度狭窄时，同侧椎动脉出现逆行血流。锁骨下动脉狭窄病例的脉冲多普勒检查显示，确实会出现来回血流的部分盗血情况。本文讨论了一种基于压力梯度波动来解释部分盗血现象的模型。文中还展示了诸如同侧手臂运动和闭塞后充血等生理操作在将部分盗血转变为完全盗血方面的作用。在进行手术搭桥以纠正部分盗血的病例中，通过生理操作前后的多普勒检查可证实存在相对盗血。
