EFFECTS OF VARIOUS TYPES OF VAGOTOMY ON ELECTRICAL AND CONTRACTILE ACTIVITIES OF THE CANINE STOMACH

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Thirteen mongrel dogs equipped with four bipolar electrodes and three strain gauges on the anterior wall of the stomach underwent three types of vagotomy: truncal vagotomy (TV)-6 dogs; selective proximal vagotomy (SPV)-3 dogs; and antral vagotomy (AV)-4 dogs.<BR>Electrical and contractile activities of the stomach were examined before and after these vagotomies on both the fasting and postprandial states. TV caused an increased incidence of dysrhythmia and a 12 to 33% reduction of the propagation velocity of the basic electrical rhythm (BER). Following feeding, the characteristic waxing and waning pattern of normal gastric contraction was altered to a monotonic steady pattern, increasing overall contraction activity of the pyloric sphincter. These changes seem to be attributable to delayed gastric emptying following truncal vagotomy.<BR>SPV reduced the propagation velocity of the BER slightly (2.5-7.3%), preserving the inherent physiological contractile activity in the antrum and pyloric sphincter, and transforming the contractile activity in the corpus to a more monotonic pattern. AV effected a localized monotonic contractile activity in the antral region with no changes discernible in the body and pyloric sphincter. The propagation velocity was not changed significantly by antral vagotomy.<BR>The discharge interval of the BER was not altered significantly by these vagotomies.
日本平滑筋学会の論文