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Using adult mongrel dogs, remnant gastric motility in relation to the changes of gastrointestinal hormone (gastrin and motilin) levels were measured under conscious states before and after distal partial gastrectomy in the Billroth I (BI) or II (BII) reconstruction and proximal partial gastrectomy with or without pyloroplasty. Remnant gastric motility was studied during the digestive and interdigestive states by chronically implanted strain gage transducer (S.G.T.) along the gastrointestinal tract. Gastrointestinal hormone levels were determined by radioimmunoassay. Results were summarized as follows: 1. Remnant gastric motility after BI was different from BII, that is, digestive patterns after BII were more shorter than BI, as a result, gastric emptying times were shortened. 2. Gastrin release by the meal intake in the dogs with BI was greater than that in BII. On the other hand, motilin release in the dogs with BII was higher level than that in BI during the digestive and interdigestive states. Gastrointestinal hormone levels after BI were approximately as same responses as controls. These findings suggested that BI reconstruction for distal partial gastrectomy was more physiological surgical procedure than BII reconstruction. 3. Remnant gastric motility during the digestive state after proximal gastrectomy showed the excitatory pattern and gastric emptying time was remarkably shortened than in controls. 4. In gastrin and motilin levels stimulated by the meal in the dogs with proximal gastrectomy, the peak of gastrin and the depression of motilin were observed more early in relation to remnant gastric emptying time. These findings suggested that the pyloroplasty for the proximal gastrectomy was necessary to prevent an increased motility of the remnant stomach during the digestive states.

An experimental study on the remnant gastric motilities and gastrointestinal hormones after various types of gastrectomies.