大面積型の体表面電極が心電図信号に与える効果

概要

論文の詳細を見る
The conventional body surface electrode of the electrocardiogram (ECG) is as much as two centimeters at most in diameter. It is known that the larger the area contacts the skin the greater cancellation of the local electromyogram (EMG) generated by the adjacent muscle fibers results in lesser noise contamination. On the other hand, a large area of the electrode is alleged to distort the ECG waveform. In this study, the effect of the area size of a body surface electrode was theoretically analyzed with a geometrical approach and we confirmed it empirically on ECG signals. The results elucidated that the size of the electrode was irrelevant to the accuracy of the waveform acquired with it. The biological potential acquired with a large sized electrode seems to be equivalent to that with a conventional electrode placed at the gravitational center of the large one, which is attribute to the unevenly distributed conductivity inside the body.
2008-10-10