Pulse reflection sites and effective length of the arterial system.
Pulse reflection sites and effective length of the arterial system.
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动脉系统的脉搏反射部位和有效长度。
DOI：
10.1152/ajpheart.1989.256.6.h1684
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发表时间：
1989
期刊：
影响因子：
--
通讯作者：
Noordergraaf,A
中科院分区：
文献类型：
--
作者：
Campbell,KB;Lee,LC;Frasch,HF;Noordergraaf,A
动脉系统有效长度 (L) 的概念意味着它可以由单个粘弹性管表示，该粘弹性管由阻抗终止，从而创建单个反射位点。尽管这个概念很简单，但多年来研究人员一直无法就 L 的值达成一致。建议的值范围从几毫米到几米，这混淆了动脉反射部位的识别。该报告通过分析和实验数据说明，如果管的输入阻抗与动脉系统的测量输入阻抗相匹配，则有效长度的确定为 L 和相应终端阻抗的无数精确解留下了空间。 L 的所有可能值都不需要与实际反射位置有任何关系。
The concept of effective length (L) of the arterial system implies that it may be represented by a single viscoelastic tube terminated by an impedance, creating a single reflection site. Although the concept is straightforward, investigators for years have been unable to agree on the value of L. Proposed values range from a few millimeters to a few meters, confounding the identification of arterial reflection sites. This report shows analytically and illustrates with experimental data that the determination of the effective length leaves room for an infinite number of exact solutions for L and the corresponding terminal impedance if the input impedance of the tube is to match the measured input impedance of an arterial system. None of the possible values of L needs to bear any relationship to actual reflection sites.