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目的:探讨顶端动脉瘤的血流动力学特点,分析动脉瘤生长、破裂的可能机制。方法:采用计算流体力学(CFD)软件结合顶端动脉瘤的医学影像,对动脉瘤内血液流动行数值模拟。结果:脉动状态下每个心动周期里,在0～0.4s内速度变化最剧烈,在动脉分叉处形成涡运动。通过瘤颈进入动脉瘤内时,血流速度骤减,在动脉瘤中央形成涡,速度逐渐减小并可能静止。瘤顶血流速度很小甚至静止。结论:顶端动脉瘤血流动力过程复杂,血管分叉处涡运动剧烈;瘤颈速度在0～0.5s内剧烈变化,受到血流的冲击瘤颈扩大使瘤生长;破裂主要在瘤顶,但是瘤顶速度很小甚至静止,瘤壁在血流冲击下的振荡是破裂的因素之一。速度是危险因子之一,0～0.5s是危险时间窗。
Objective: To investigate the hemodynamic characteristics of apical aneurysms and to analyze the possible mechanism of aneurysm growth and rupture. Methods: The numerical simulation of blood flow in aneurysms was performed using computational fluid dynamics (CFD) software combined with medical images of the apical aneurysm. Results: During each pulse cycle, the most rapid change of velocity occurred in 0 ~ 0.4s and the vortex motion at the bifurcation of artery. When entering the aneurysm through the neoplasm, the velocity of the blood flow is abruptly reduced and vortices form in the center of the aneurysm, which decreases in velocity and may be at rest. Tumor blood flow velocity is small or even at rest. Conclusions: The hemodynamic process of the top aneurysm is complex and the vortex motion is severe at the bifurcation of the aneurysm. The tumor neck velocity changes drastically from 0 to 0.5s, Tumor at the top of the speed is small or even static, the tumor wall under the impact of blood flow is one of the factors of rupture. Speed is one of the risk factors, 0 ~ 0.5s is a dangerous time window.