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本文用自行研制的双通道阻抗/导纳仪同时检测了20例正常年轻人胸部三个方向上的心阻抗变化。并将 X、Y、Z 三个方向的信号ΔZz、ΔZx、ΔZY(简称ΔZ)和 dz_x/dt、dz_x/dt、dz_y/dt(简称 dZ)分别两两合成平面阻抗环。比较环的面积(∧)和形状指数(b/a),发现Ⅰ类环面积较小(∧<4.6×10~(-3)Ω~2,环形状不清(b/a<0.4);Ⅱ类环类似(∧<6.8Ω~2/S~2;b/a<0.4);但是,Ⅲ类环面积较大且有一定的形状(b/a>0.45),与上两种环相比有显著差别(配对 t 检验 P<0.01)。结果表明心阻抗变化具有一种空间对称式的相似性,故提示心肌收缩运动本身可能是脚阻抗交化的一个重要起因。实验支持阻抗容积图的电场理论。
In this paper, the self-developed dual-channel impedance / admittance detector was used to detect the change of heart impedance in three directions of the chest of 20 normal young adults at the same time. And the signals ΔZz, ΔZx, ΔZY (abbreviation ΔZ) and dz_x / dt, dz_x / dt and dz_y / dt (dZ) in three directions of X, Y and Z are respectively combined to form a plane impedance ring. Comparing the area (∧) and the shape index (b / a) of the ring, it was found that the ring area of type Ⅰ was smaller (∧ <4.6 × 10 -3 Ω -2) and the shape of the ring was unclear (b / a <0.4) However, the type Ⅲ annulus has a large area with a certain shape (b / a> 0.45), which is similar to that of the upper two types of mesophases (∧ <6.8Ω ~ 2 / (Paired t-test P <0.01) .The results showed that the cardiac impedance changes with a spatial symmetry similarities, suggesting that myocardial contractility itself may be an important cause of foot resistance cross-resistance.Experimental support impedance volumetric graph Electric field theory.