抄録
The electromyograms of 48 canine and 20 human stomachs were recorded with bipolar lead using two silver needles which are 170, μ in diameter and 1. 5mm apart each other.
The results were as followed :
1) The rhythmical electrical discharge was observed in advance of the visible peristalsis which occured in middle part of the gastric body and propagated downwards. The electrical discharge formed slow spike. And the spike had different characteristics at different portions of the stomach. For example, the voltage of the spike was highest and the duration was shortest at the antrum. It seems to be indicating the limit of magnitude of peristaltic contraction there.
2) The voltage of the spike seemed to be innate at each portion of each stomach. And it could not be changed by many small factors which change the magnitude of peristaltic contraction. The voltage was suppressed only by such very active factors as deep ether anesthesia or adrenalin. The change usualy apeared in frequency of the spikes governing the peristaltic frequency. The most active factors were drugs, temperature and mechanical extension, which are supposed to have direct action upon the metabolism and the elactrical activity of the smooth muscle. It is sugested that the stomach has automatic mechanism and the nerve only control it.
These characters of the electrical activity are observe don both canine and human stomach. The analysis of the electromyogram is considered to be useful to research into the gastric patho-physiology.
