Abstract
The results of the investigation to know whether the potential of the central terminal is as small as neglisible clinically or not, and to know mush potential it is, are as follows : (1) To get precise data of potential of the central terminal with these two methods, the body must be laid on its back with its limbs out of water preventing them from getting wet.(2) The potential of the central terminal measured with Wilson's and with Shimizu-Fujito's method respectively in 20 patients (12 patients with normal heart and 8 with enlarged heart) shows 0.16∼0.55mV in the former and 0.09∼0.50 mV in the latter. Thus, there may be such a case in which the potential is not always below 0.30 mV as Wilson says.(3) In the unipolar chest lead in which the potential is too large to compare with that of central terminal, the latter may be disregarded to a certain extent. But in the unipolar limb lead with its small potential difference, the potential of central terminal can not be disregarded.(4) These results indicate that it is very difficult to say which one of these two methods may have more ideal potential of the central terminal as a zero potential.
