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使用Heather指数(HI)来反映心脏收缩强度或心肌应力的大小,已有十余年的历史。1985年,吕景新等根据理论分析和动物实验证实,Heather指数受基础阻抗(Z_0)的严重影响。因此认为用HI(dz/dt|max/T_(R-Z))来反映心肌收缩应力的大小只能在基础阻抗不变或相差不大的条件下使用,否则将不能利用HI的大小来充分反映心肌收缩应力的大小,并建议采dy/dt|max/T_(R-Y)来代替HI。式中Y代表导纳,即Y=1/Z,dy=-dz/Z~2。为了区别,本文拟将这一新指数暂名为L指数(LI)。为了进一步探讨LI与HI的区别,
Heather index (HI) to reflect the magnitude of cardiac contractility or myocardial stress, has more than 10 years of history. In 1985, Lv Jingxin and other animal experiments based on theoretical analysis and confirmed that Heather index by the basic impedance (Z_0) of the serious impact. So that the use of HI (dz / dt | max / T_ (RZ)) to reflect the size of the myocardial contraction stress can only be used in the same or less basic impedance, or will not be able to use the size of HI to fully reflect the myocardium Shrinkage of the size of the stress, and recommended mining dy / dt | max / T_ (RY) instead of HI. Where Y represents admittance, that is, Y = 1 / Z, dy = -dz / Z ~ 2. In order to distinguish, this article tentatively named this new index L index (LI). In order to further explore the difference between LI and HI,