锁骨下动脉偷漏综合征(Subclavian Steal Syn-drome),系由于锁骨下动脉狭窄或梗阻而引起的一系列症状。在生理状态下,颅内动脉压力较主动脉弓及其分支的压力为低,由于此一压差,才能保证血液从主动脉沿颈动脉及椎动脉由下而上的流入颅内。如果一侧锁骨下动脉发生狭窄或梗阻,则患侧颈动脉或椎动脉便不能维持正常的由下而上的压差,从而导致患侧血流倒转。由于患侧上肢的供血不是来自压力甚大的主动脉,而是来自压力较低的颅内动脉,又由于 Subclavian Steal Syn-drome, a series of symptoms caused by stenosis or obstruction of the subclavian artery. Under physiological conditions, intracranial arterial pressure is lower than that of the aortic arch and its branches. Because of this pressure differential, blood flow from the aorta to the cranial artery along the carotid and vertebral arteries can be guaranteed. If there is a stenosis or obstruction of the subclavian artery on one side, the normal side-to-side pressure difference can not be maintained in the affected side carotid artery or vertebral artery, resulting in inversion of the affected side blood flow. As the ipsilateral upper limb blood supply is not from the pressure of the aorta, but from the lower pressure intracranial artery, and because