脑循环动力学模型与血管输入阻抗模拟

本文提出了一个脑循环血液动力学模型，在模型中不仅考虑了血管弹性、阻力和惯量等动力学参数，而且还考虑了交通动脉的血管代偿功能。通过模型控制方程求解得到了颈动脉和椎动脉的输入阻抗，理论和实验结果完全相一致。模拟结果表明：当颈动脉或推动脉动力学参数变化时，它不仅影响同侧的动脉阻抗，而且还影响到对测血管床。这提示，颈动脉或推动脉输入阻抗不仅和自身系统血管特性有关，而且还受其它循环的影响，有时这种影响还是显著的。

Impedance of Cerebrovascular System Simulated by a Hemodynamic Model of Brain Circulation

A hemodynamics model of cerebral Willis circulation is proposed. The model consists of the com-pensation of blood now as well as the compliance, resistance and inductance of arteries. The impedances of carotidand vertebral arteries are obtained by solving the govern equations. The theoretical impedances cbrrespond wellwith the experimental results. The simulating results demonstrate that the alteration of the arterial dynamic pa-rameters innuences not only the ipsilateral impedance but also the contralateral arterial system. These conclusionssuggest that the carotid or vertebral impedance is not suitable for describing the behaviour of its own arterial sys-tem, because the impedance is also innuenced by the other arterial system and blood pressure.