抄録
Characteristic change of impedance by a sinusoidal voltage of electro-dermal point is remarkable at low frequency area of below 1 K c/s and difference with the normal skin becomes smaller as frequency increases. That is to say, resistance component is small, capacity component is large and its loss angle gets larger. The value depends on each electro- dermal point. That is parallel to a series of permeable changes of electro-dermal point. In regards to inflammatory diseases with permeable skin changes, there is a great difference in impedance, in proportion to the depth of the skin where the disease exists. Therefore, when permeable changes exist in hypodermic tissues and Lower layers of the dermis, impedance element and loss angle shows almost no change to the normal skin in all the measurable frequencies.
The permeable changes reach the epidermis, change of impedance element becomes larger and at the low frequency area where the rate of change is great, as the result of spread of the disease to the layers of the epidermis, change rate of impedance and also loss angle become greater. That is, frequency characteristic curves of impedance element and loss angle of permeable disease at each depth in the epidermis, coincides, with these of various stages of electro-dermal point. Therefore, the fact that impedance element and loss angle of electro-dermal point shows various values can be considered as almost parallel to the stages in which exudative change and partial necrosis of electro-dermal points starting from the surrounding area of basal cell layer spread to the superficial layers of the epidermis.
Therefore, electro-dermal points of various stages, by using skin impedance bridge, can be recorded quantitatively and I trust that it will help advance the diagnostic significance of electrodermal points.
