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Abstract
The purpose of the present study was to evaluate the effect of somatostatin on gastric acid secretion and gastric antral motility in conscious dogs with gastric fistula. Infusion of pentagastrin induced motility with a digestive pattern. Somatostatin inhibited dose-dependently the stimulated acid secretion, whereas the effect on antral motility was more complex, acting especially on the amplitude of the contractions. The effects of somatostatin were not altered by using α-and β-adrenergic, dopaminergic, and serotonergic blocking drugs. The dose-response kinetics with seven doses of pentagastrin with and without somatostatin showed inhibition of a competitive type for gastric acid secretion and of a non-competitive type for antral motility with regard to amplitude.