Abstract
Since the first report by Schellong. in 1936, many researches have been done by many authors on vectorial method of electrical heart events Because of excellency of this method for researches of cardiac function or for diagnosis of heart diseases, various methods have been developed. Among of them, the Polyography by Toyoshima. is the most excellent method so far as they concern with vectorial representation with scarce deformation. But, for the reason of its requirement of a special Braun tube, we can not apply it easily anywhere. So another new simple and excellent method of vectorcardiography was reported here. This is one of the type of multipolar chest lead VCG like polygraphy by Toyoshima. To obtain the spatial VCG, four pairs of electrodes were placed on the chest wall surroundings the heart circularly. The position of electrodes in frontal, horizontal and sagittal VCG were the same with those by Polyography. In this method it was sufficient to only two push-pull amplifiers instead of four push-pull amplifiers by Polyography, because four electrodes situating opposite to each other were used as a pair of in-put electrodes being connected to one terminal through each 100,000 ohm resistance. Namely the in-put voltage in vertical or horizontal lead was led from each four electrodes situating opposite up to down or side to side. According to the previous reports by Toyoshima. and co-workers, vectors obtained by calculations were almost identical to those by experiments. The sa,e fact was recognized also in these model experimens. So the discrepancy represented vector was discussed by calculation. The result were follows. The VCG obtained by this method showed far less deformation than those by usual method and was not so different from polyograms. The excellency of this method was proved more distinctly by the excentrical position of generating electromotive forces. Further, here was discussed also the deformation of VCG obtained by eight pairs of electrodes instead of four pairs. The VCG by eight pairs showed less deformation than those by four pairs. It may be expected farless deformation when used 16,32 ... pairs of electrodes. The more electrodes were used, the less deformation could be recognized. Supplementally, here was discussed the deformation of VCG by nearly same method. in which single ended amplifiers were used instead of push-pull ones. By this method larger deformation could be recognized than that by push-pull amplifiers. If there was any short circuit between the vertical and horizontal deflection plates, it was indispensable to change push-pull connection to single ended ones in its last stage. The characteristics of this new method were as follows. 1) The more electrodes were used, the less deformation could be recognized. 2) However numerous the electrodes might be , it was sufficient to use only two push-pull amplifiers. 3) it did not require a special Braun tube for this new method, but could be dealed sufficiently with an usual Braun tube.
