Authors: Yong Lei Jinhong Xing Jiande Chen
Publish Date: 2008/05/15
Volume: 53, Issue: 8, Pages: 2066-2071
Abstract
Background Gastric electrical stimulation GES can improve symptoms in patients with gastroparesis and induce weight loss in obese subjects Aims To evaluate the effect on gastric tone of GES under different conditions at different sites of the stomach Methods Eleven dogs were implanted with a gastric cannula and two pairs of stimulation electrodes in the middle of the lesser curvature and of the greater curvature 10 cm from the pylorus Gastric tone was assessed with a barostat GES was applied using 1 Enterra conditions 14 Hz 5 mA 03 ms 01 s on 5 s off 2 modified Enterra conditions 40 Hz 5 mA 03 ms 01 s on 5 s off and 3 implantable gastric stimulation IGS conditions 40 Hz 5 mA 03 ms 2 s on 3 s off Six sessions were performed randomly with each animal on six separate days Results 1 At the lesser curvature GES with modified Enterra conditions significantly elevated gastric volume from 969 ± 83 ml at baseline to 1339 ± 117 ml P = 0015 and a similar effect was observed with IGS 913 ± 71 ml vs 1863 ± 271 ml P = 0013 GES with Enterra conditions had no such an effect 2 At the greater curvature GES with Enterra conditions significantly increased gastric volume from basal 941 ± 44 ml to 1221 ± 113 ml P = 0032 modified Enterra conditions had the opposite effect 965 ± 90 ml vs 774 ± 117 ml P = 0025 and no significant effect was observed with IGS conditions Conclusion The effects of GES on gastric tone vary with the conditions and sites of stimulation These findings may help to explain the distinct effects of GES therapy in patients with gastroparesis and obesity
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