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作者观察了实验性狭窄犬冠状动脉分支后传统心阻抗图的波形改变和多导联心阻抗环的变化.发现dZ_k/dt收缩期射血主波升支伴随冠脉狭窄出现顿挫、切迹抬高或M型双峰等显著变异(P<0.01).多导联心阻抗环dZ_Y/dt-△Z_Z和△Z_Y-dZ_X/dt的面积在左前降支结扎后减小了27.7％和32.3％(P均<0.01).而△Z_Y-△Z_Z和△Z_Y-△Z_X的面积则无明显变化(P均>0.05).结果提示,冠脉狭窄所致心肌缺血可引起传统心阻抗图波形变异,同时破坏多导联心阻抗环的空间对称性质.作者还探讨了波形变异的可能机理.
The authors observed changes in the waveform of the traditional cardioresistance graph and the changes in the multi-impedance cardioresistance ring following experimental coronary artery stenosis in dogs and found that the ascending branch of the main wave of dZ-k / dt systolic ejection fell with coronary stenosis, (P <0.01). The area of multidirectional cardiac impedance rings dZ_Y / dt- △ Z_Z and △ Z_Y-dZ_X / dt decreased by 27.7% and 32.3% after left anterior descending coronary artery ligation, respectively (P <0.01), while the areas of △ Z_Y- △ Z_Z and △ Z_Y- △ Z_X had no significant changes (all P> 0.05) .The results suggest that myocardial ischemia caused by coronary artery stenosis may cause the traditional ECG impedance waveform Variation, at the same time, destroy the space symmetry property of multi-lead heart impedance ring.The author also discusses the possible mechanism of waveform variation.