“有效长度”的意思是系统的动脉树可用一带有终端反射的等效管来表示。“有效长度”是从主动脉瓣到此反射端的距离。目前此项研究的目的就是建立确定此距离的新方法。在稳态情况下测量了复杂负载下狗的主动脉压力、流量及直径。主动脉系统可用一均匀的光滑弹性管(等效管)来表示。管子的长度d代表有效长度,t和c分别表示管子的每单位长度的惯性及顺应性。负载参数为:周边总 “Effective length” means that the system’s arteries can be represented by an equivalent tube with terminal reflections. “Effective length” is the distance from the aortic valve to this reflex tip. The purpose of this study is to establish a new method to determine this distance. The aortic pressure, flow rate, and diameter of dogs under complex loading were measured at steady state. Aortic system can be a smooth uniform elastic tube (equivalent tube) to represent. The length d of the pipe represents the effective length and t and c represent the inertia and compliance per unit length of the pipe, respectively. Load parameters: the total circumference