PMID: 701124Sep 1, 1978Paper

Effects of lung volume and electrode position on the esophageal diaphragmatic EMG

Journal of Applied Physiology: Respiratory, Environmental and Exercise Physiology
M J KimJ T Sharp

Abstract

In anesthetized dogs studied both supine and prone, the electromyogram (EMG) of the diaphragm recorded directly from three portions of the diaphragm (crural, anterior, and costal) was compared with simultaneous recordings of the diaphragmatic EMG recorded from 10 sites in the esophagus and stomach. Effects upon the EMG of lung volume change and esophageal electrode position change were determined during bilateral supramaximal tetanic phrenic stimulation with airway occluded. Lung volume change had little effect upon the directly recorded EMG. The effect of lung volume change upon the EMG recorded from the esophagus was somewhat greater and marked change was noted as the esophageal recording site was varied. In supine dogs two sites of maximal signal were observed, one 1 cm above the cardia and the other 4--6 cm below the cardia. In prone dogs a single site for maximal signal was observed 3 cm above the cardia. An electrode site as close to the cardia as possible appears to be optimal from the point of view of variation in signal due to lung volume change and due to body position change. Gastric balloon stabilization is recommended. Proximity of the electrode and posterior gastric wall to the diaphragmatic crura may explain the ...Continue Reading

Citations

Sep 1, 1983·Anaesthesia·A B Baker, C McLeod
Aug 21, 2002·American Journal of Respiratory and Critical Care Medicine·UNKNOWN American Thoracic Society/European Respiratory Society
Sep 11, 2008·Clinical Science·Yuan Ming LuoMichael I Polkey
Mar 25, 2020·Critical Care : the Official Journal of the Critical Care Forum·Michele BertoniEwan C Goligher
Nov 11, 1999·American Journal of Respiratory and Critical Care Medicine·Y M LuoJ Moxham
Apr 12, 2001·Journal of Applied Physiology·Y M LuoJ Moxham

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