Abstract: The hemodynamic change induced by embolization of the cerebral arteriovenous malformation(AVM) was analyzed using the Water Hammer principle. The highest pressure that can be reached when the water hammer phenomenon occurs was calculated. The acute instantaneous pressure rising may be an important factor leading to intracranial hemorrhage or swelling when the AVM is embolized. It is shown that long feeding artery of AVM will increase the possibility of direct water hammer, and high wall shear stress of feeding artery will increase the water hammer pressure. This suggests that such kind of AVMs should be embolized stepwise and the systemic pressure should be rationally reduced before embolization.

Key words: cerebral arteriovenous malformation(AVM), water hammer, embolization, hemodynamics, acute intracranial hemorrhage

摘要： 以水击原理分析了脑AVM栓塞治疗时血液动力学变化过程，计算了瞬时水击压力可能达到的最高值。瞬时增高的水击压力可能是AVM栓塞时发生急性脑出血或脑肿胀的重要血液动力学因素。而AVM供血动脉血管壁面切应力偏高和供血动脉过长可增加水击的危险程度，提示对这类结构AVM栓塞治疗时应采取合理的降压措施并尽可能分多次栓塞。

关键词: 脑动静脉畸形, 水击, 栓塞, 血液动力学, 急性脑内出血