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BMC Surgery

, 2:5

First Online: 30 July 2002Received: 15 February 2002Accepted: 30 July 2002 Summary

BackgroundThe aim of this study was to test the effect of different pulse frequencies and amplitudes during gastric stimulation GS on gastric emptying in the rat.

MethodsGS was performed in 2 groups of laparotomized rats: healthy control animals, and rats with acute diabetes. The effects of four pulse frequencies 0.5, 1, 10, 20 Hz and three pulse amplitudes 5, 20, 40 mA were tested. The volumes emptied from the stomach after the oro-gastric instillation of a nutrient solution were compared to those obtained in animals without GS. Intragastric pH values were assessed under basal conditions and after GS.

ResultsIn both groups, GS increased emptied volumes compared to conditions without stimulation p < 0.05 for pulse frequencies above 0.5 Hz. Increases in pulse frequencies accelerated gastric emptying p < 0.01 with a plateau at around 10 Hz. The increase in pulse amplitudes resulted in larger emptied volumes only when the pulse frequency was 1 Hz p < 0.04 while the opposite effect was observed at 20 Hz p < 0.04. The most effective combinations to enhance gastric emptying compared to baseline conditions were 10 Hz with 5 or 20 mA. The overall effect of GS on gastric emptying compared to baseline conditions without stimulation, was greater in diabetic than in controls rats p < 0.05. During stimulation, intragastric pH values were not different from basal conditions during fasting or after a meal in control and diabetic rats.

ConclusionsAlthough both pulse frequency and amplitude should be considered during GS, frequency appears to be the most critical point. The possibility of increasing gastric emptying by electrical stimulation in diabetic rats suggests potential clinical applications for this method.

Electronic supplementary materialThe online version of this article doi:10.1186-1471-2482-2-5 contains supplementary material, which is available to authorized users.

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Autor: Isabelle Le Blanc-Louvry - Florence Guerre - Badjona Songné - Philippe Ducrotté


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