Gastric wall tension determines perception of gastric distention

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Gastric wall tension determines perception of gastric distention Eleonora Distrutti, Fernando Azpiroz, Alfredo Soldevilla, Juan–R. Malagelada Gastroenterology Volume 116, Issue 5, Pages 1035-1042 (May 1999) DOI: 10.1016/S0016-5085(99)70006-5 Copyright © 1999 American Gastroenterological Association Terms and Conditions

Fig. 1 The gastric tensostat is a computerized air pump that applies a constant tension level on the gastric wall. Based on intragastric pressure and volume, the system calculates wall tension and drives the pump to maintain the preselected tension level. Gastroenterology 1999 116, 1035-1042DOI: (10.1016/S0016-5085(99)70006-5) Copyright © 1999 American Gastroenterological Association Terms and Conditions

Fig. 2 Example of gastric distention with the tensostat. Steps of operation: (1) based on the pressure and volume in the pump, the system corrects for air compressibility; (2) based on corrected intragastric volume and transmural pressure, the system calculates wall tension; and (3) operates the pump to maintain tension within ±1 g of the preselected level. Gastroenterology 1999 116, 1035-1042DOI: (10.1016/S0016-5085(99)70006-5) Copyright © 1999 American Gastroenterological Association Terms and Conditions

Fig. 3 Effect of shape on wall tension: theoretical validation. Ellipsoidal deformation produces a relatively small decrease in wall tension compared with the sphere. Gastroenterology 1999 116, 1035-1042DOI: (10.1016/S0016-5085(99)70006-5) Copyright © 1999 American Gastroenterological Association Terms and Conditions

Fig. 4 Gastric distentions with the barostat. At the same pressure levels, intragastric volume, gastric wall tension, and perception were larger when the stomach was relaxed by glucagon (▴) than during IV saline (□). *P < 0.05 vs. saline. Gastroenterology 1999 116, 1035-1042DOI: (10.1016/S0016-5085(99)70006-5) Copyright © 1999 American Gastroenterological Association Terms and Conditions

Fig. 5 Gastric distentions with the tensostat. The same tension levels produced significantly larger intragastric volumes when the stomach was relaxed by glucagon (▴); nevertheless, perception remained similar than during IV saline (□). *P <0.05 vs. saline. Gastroenterology 1999 116, 1035-1042DOI: (10.1016/S0016-5085(99)70006-5) Copyright © 1999 American Gastroenterological Association Terms and Conditions