Turzová M, Tysler M, Kneppo P
Institute of Measurement Science, Slovak Academy of Sciences, Bratislava.
J Electrocardiol. 1994 Jul;27(3):255-62. doi: 10.1016/s0022-0736(94)80010-3.
The effect of electrode displacement as one of the sources of reproducibility errors in body surface potential maps was studied using a realistic computer model of the cardiac electric field. A uniform dipole layer model of the cardiac generator and a realistic geometry of the torso, heart, and lungs was adopted for the simulation of surface potentials during ventricular activation. The effect of systematic electrode displacement in terms of longitudinal shifts and variations of longitudinal size (height) of the mapped area was studied. The map reconstruction error of three different limited lead systems and the variability of maps measured on all points of the mapping grid, as well as maps reconstructed from limited lead systems, were investigated and quantified. A mean relative error of map reconstruction of less than 3.5% was found for longitudinal shifts from -4.4 to +1.7 cm, and for longitudinal size changes from 65 to 108% of the initial area. For vertical displacements of electrodes between the limits of +/- 2.0 cm for full grid maps and +/- 1.4 cm if limited lead systems were used, the mean relative error of the maps remained under 5%.
利用逼真的心脏电场计算机模型，研究了电极位移作为体表电位图再现性误差来源之一的影响。采用心脏发生器的均匀偶极层模型以及躯干、心脏和肺部的逼真几何形状，来模拟心室激活期间的表面电位。研究了系统电极位移在纵向偏移以及映射区域纵向尺寸（高度）变化方面的影响。对三种不同的有限导联系统的图重建误差以及在映射网格所有点上测量的图的变异性，以及从有限导联系统重建的图进行了研究和量化。发现当纵向偏移在 -4.4 至 +1.7 cm 之间，纵向尺寸变化为初始面积的 65% 至 108% 时，图重建的平均相对误差小于 3.5%。对于全网格图，电极在 +/- 2.0 cm 范围内垂直位移，若使用有限导联系统则在 +/- 1.4 cm 范围内，图的平均相对误差保持在 5% 以下。
