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目的:探讨顶端动脉瘤的血流动力学特点,分析动脉瘤的生长、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数值模拟切应力进行分析。结果:0～0 .2 2 T时,血管内血流速度急剧上升到最大值;0 .2 2～0 .5 5 T时,从最大值急剧下降到初始值。切应力随血流速度变化,在0 .2 2 T时动脉瘤颈部切应力值最大,0 .5 5 T时最小,而在这两时刻,动脉瘤壁不存在切应力。结论:切应力由血流冲击造成,其大小与血流速度变化一致。CFD数值模拟是一种反映动脉瘤血流动力学较好的方法,为动脉瘤的病理生理机制和临床治疗提供较好的帮助。
Objective: To investigate the hemodynamic characteristics of the apical aneurysm and to analyze the possible mechanism of aneurysm growth and rupture. Methods: Computed tomography (CFD) software was used in combination with the medical images of the apical aneurysm to analyze the numerical simulation of shear stress in the aneurysm. Results: At 0 ~ 0.2 2 T, the intravascular blood flow velocity rose sharply to the maximum value; from 2.2 to 0.55 T, the maximum value dropped sharply to the initial value. The shear stress changes with the blood flow velocity, the aneurysm neck shear stress value is the highest at 0.222 T, and the smallest at 0.55 T, while there is no shear stress in the aneurysm wall at these two time points. Conclusion: Shear stress is caused by the impact of blood flow, which is consistent with the change of blood flow velocity. CFD numerical simulation is a good method to reflect the hemodynamics of aneurysms and provides better help for the pathophysiological mechanism and clinical treatment of aneurysms.