[Electromyographical study of the intestinal movement in simple obstruction].

An electromyographical study of the intestinal movement in simple obstruction was performed in dogs and the conclusions are as follows. When the intestinal tract was obstructed by a ligation apparatus, electromyographically spike waves disappeared reflectively in both upper and lower intestinal tracts in the ligation site, and the resting pattern showing only BER was maintained for 20 to 80 minutes. The spike waves which reappeared were blocked at the ligation site without conduction from upper part to lower part. A comparison of electric activities after obstruction shows that at the upper part activities started to increase earlier and then gradually decreased 5 hours after obstruction. Activities at the lower part, on the contrary, started to decline immediately and this declining tendency continued for long time. Abnormal propagation patterns appeared about 3 hours after obstruction and were observed at both the upper and lower parts of the ligation site. The propagation-velocity increased linearly for 7 hours after obstruction in the upper part and finally reach a plateau. At the lower part the velocity was nearly fixed at the control level. A comparison of BER frequency after obstruction shows that at the lower part of the ligation site the frequency decreased remarkably in an earlier period, while in the upper part it became prominent for 24 to 30 hours.