Effects of chronic left vagal stimulation on visceral vagal function in man
| Autor: | Gervais Tougas, Andrew Talalla, Glenn Shine, Adrian R.M. Upton, Peter Hudoba, Debbie Fttzpatrick, Richard H. Hunt |
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| Rok vydání: | 1992 |
| Předmět: |
Adult
Male medicine.medical_specialty Vagal stimulation Efferent Acid output Neural Conduction Stimulation Electric Stimulation Therapy Efferent Pathways Nerve conduction velocity Gastric Acid Basal (phylogenetics) Epilepsy Complex Partial Esophagus Internal medicine medicine Humans Evoked Potentials Afferent Pathways business.industry digestive oral and skin physiology Electroencephalography Vagus Nerve General Medicine Prostheses and Implants medicine.anatomical_structure Endocrinology Food Female Cardiology and Cardiovascular Medicine business Gastric acid output |
| Zdroj: | Pacing and clinical electrophysiology : PACE. 15(10 Pt 2) |
| ISSN: | 0147-8389 |
| Popis: | We examined the effects of chronic left vagal electrostimulation on afferent and efferent gastrointestinal vagal function in eight patients. Afferent function was assessed using cortical evoked responses to electrical stimulation of the esophagus and to direct vagal stimulation using the implanted left vagal electrode. Efferent gastrointestinal vagal function was measured by examining the basal, maximal, and sham fed stimulated gastric acid output prior to and with chronic left vagal electrostimulation. Esophageal electrostimulation produced a cortical evoked response consisting of three negative and three positive peaks within 400 msec after stimulation. Prior to vagal electrostimulation the mean conduction velocity of the afferent signal was measured at 8.72 +/- 3.39 m/sec, compatible with A-delta fibers involvement. Basal, maximal, and sham fed acid output were 1.11, 21.87, and 9.37 mmol/hour, respectively. The evoked response to esophageal electrical stimulation was not changed with chronic left vagal electrostimulation. Direct vagal stimulation also produced evoked potentials that were comparable to those obtained with esophageal stimulation. The mean conduction velocity was 6.26 +/- 2.72 m/sec (NS) so that there was no evidence of loss of myelinated fibers with chronic stimulation. No differences were detected in basal (1.29 mmol/h), maximal (21.64 mmol/h), or sham fed stimulated (8.03 mmol/h) acid output, showing that vagal electrostimulation has no effect on either total or vagally mediated acid output, an efferent vagal function. In conclusion, chronic left vagal electrostimulation has no significant adverse effect on gastrointestinal vagal function. |
| Databáze: | OpenAIRE |
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