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用无创性检查方法,研究心血管疾病的血流动力学改变,国内外文献已有报道,但应用导纳图法研究老年人心脏血流动力状态,则罕有报道。本文对34例健康老年人的导纳微分图[dy/dt]进行研究,与中青年组40例、老年前组41例作了对照,就其血流动力学改变,进行了讨论。导纳是阻抗的倒数,即 Y=1/Z,则 dy/dt=1_2/Z~2·dz/dt。经数学推导,得出下列公式,类似 Kubicek 公式,但舍去了阻抗图的 Z。值。公式如下:SV=ρ·L~2·dy/dt | max·T·10~(-(?))。式中 SV 系心脏每搏输出量,ρ:血流电阻率,取135 Ω·cm;L:两极间距离,一般为25cm;dy/dt | max:C 波顶点至基线的实测
Noninvasive examination of the hemodynamic changes in cardiovascular disease has been reported in the literature both at home and abroad. However, it is rarely reported that admittance maps are used to study the hemodynamic status of the heart in the elderly. In this paper, 34 cases of healthy elderly admittance differential diagram [dy / dt] were studied, and 40 cases of young and middle-aged group of 41 patients compared to hemodynamic changes were discussed. Admittance is the inverse of the impedance, that is, Y = 1 / Z, then dy / dt = 1_2 / Z ~ 2 · dz / dt. Derived mathematically, the following formula is derived, similar to the Kubicek’s formula, but the Z of the impedance graph is discarded. value. The formula is as follows: SV = ρ · L ~ 2 · dy / dt | max · T · 10 ~ (- (?)). Where SV is the cardiac stroke volume, ρ: the resistivity of the blood flow, taking 135 Ω · cm; L: the distance between the two electrodes, typically 25 cm; dy / dt | max: