Distribution of Heart Potentials on the Thoracic Surface of Normal Human Subjects
Distribution of Heart Potentials on the Thoracic Surface of Normal Human Subjects
复制标题
正常人胸廓表面心脏电位的分布
作者：
B. Taccardi
本文测定了15名15 ~ 43岁正常人心室激动时10 ~ 20个瞬间的胸壁等电位线分布。在QRS间期开始时，可以观察到心前区最大电位和背侧最小电位。此后，最小值移向右肩，然后出现在右锁骨下窝前方，而另一个最小值出现在胸骨中线附近。两个极小值最终合并在一起，并且电势分布再次变为偶极。在QRS间期的最后三分之一期间，电位的最大值向左腋和背侧区域移动，而新的最大值出现在胸骨上端附近。表面和心内电事件之间的初步相关性可以建立在最普遍接受的心室激动过程的描述的基础上。在心室激动的某些阶段，身体表面上的电位分布是偶极型的，并且没有可测量的局部成分;然而，在心室去极化的其他阶段，邻近电位确实出现在胸部表面，产生关于局部激动波的信息。当心室激动改变时，局部和偶极电位的位置和时间过程显示出重要的修改。
The distribution of isopotential lines on the thoracic surface of 15 normal subjects aged 15 to 43 was determined at 10 to 20 instants of time during ventricular activation. At the beginning of the QRS interval a precordial maximum and a dorsal minimum of potential can be observed. Thereafter, the minimum migrates toward the right shoulder and appears then anteriorly in the right subclavicular fossa, while another minimum appears near the mid-sternal line. The two minima finally merge together, and the potential distribution becomes dipolar once again. During the last third of the QRS interval the maximum of potential moves toward the left axillary and dorsal region, while a new maximum appears near the upper end of the sternum. A tentative correlation between surface and intracardiac electrical events can be established on the basis of the most generally accepted descriptions of ventricular activation processes. During some phases of ventricular activation, the potential distribution on the surface of the body is of the dipolar type, and there are no measurable local components; during other phases of ventricular depolarization, however, proximity potentials do appear on the thoracic surface, yielding information about local activation waves. When the ventricular activation is altered, the location and time course of local and dipolar potentials show important modifications.