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| Research article summary (published 27 Feb 2002): |
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Validation of improved recording site to measure phrenic conduction from surface electrodes in humans.
Full Abstract
Phrenic nerve stimulation, electrical (ES) or from cervical magnetic stimulation (CMS), allows one to assess the diaphragm contractile properties and the conduction time of the phrenic nerve (PNCT) through recording of an electromyographic response, traditionally by using surface electrodes. Because of the coactivation of extradiaphragmatic muscles, signal contamination can jeopardize the determination of surface PNCTs. To address this, we compared PNCTs with ES and CMS from surface and needle diaphragm electrodes in five subjects (10 phrenic nerves). At a modified recording site, lower and more anterior than usual (lowest accessible intercostal space, costochondral junction) with electrodes 2 cm apart, surface and needle PNCTs were similar (CMS:
6.0 +/- 0.25 ms surface vs. 6.2 +/- 0.13 ms needle, not significant). Electrodes recording the activity of the most likely sources of signal contamination, i.e., the serratus anterior and pectoralis major, showed distinct responses from that of the diaphragm, their earlier occurrence strongly arguing against contamination. With ES and CMS, apparently uncontaminated signals could be consistently recorded from surface electrodes.
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Author information
Author/s: Verin, Eric (E); Straus, Christian (C); Demoule, Alexandre (A); Mialon, Philippe (P); Derenne, Jean-Philippe (JP); Similowski, Thomas (T);
Affiliation: UPRES EA 2397, Université Pierre et Marie Curie Paris VI, 75013 Paris, France.
Journal and publication information
Publication Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Validation Studies
Journal: Journal of applied physiology (Bethesda, Md. : 1985) (J Appl Physiol), published in United States. (Language: eng)
Reference: 2002-Mar; vol 92 (issue 3) : pp 967-74
Dates: Created 2002/02/13; Completed 2002/05/07; Revised 2006/11/15;
PMID: 11842028, status: MEDLINE (last retrieval date: 11/6/2008)
Sourced from the National Library of Medicine. Abstract text and other information may be subject to copyright.
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