Diaphragm compound muscle action potential measured with magnetic stimulation and chest wall surface electrodes

To seek a method to reliably measure phrenic nerve conduction time (PNCT) with magnetic stimulation we investigated two stimulus sites, placing the magnetic coil at the cricoid cartilage (high position) or close to the clavicle (low position). We also compared compound muscle action potential (CMAP)...

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Bibliographic Details
Published in:Respiratory physiology & neurobiology 2002-06, Vol.130 (3), p.275-283
Main Authors: Luo, Y.M, Mustfa, N, Lyall, R.A, Man, W.D.C, Glérant, J.C, Polkey, M.I, Moxham, J
Format: Article
Language:English
Subjects:
Action Potentials - physiology
Adult
Aged
Air breathing
Biological and medical sciences
Diaphragm - physiology
Electric Stimulation
Electrodes
Fundamental and applied biological sciences. Psychology
Humans
Magnetics
Mammals, humans
Methods, nerve conduction time, magnetic stimulation
Middle Aged
Motor Neurons - physiology
Muscle, diaphragm, compound action potential
Neck
Nerve, phrenic, conduction time
Neural Conduction - physiology
Phrenic Nerve - cytology
Phrenic Nerve - physiology
Respiratory system: anatomy, metabolism, gas exchange, ventilatory mechanics, respiratory hemodynamics
Thorax
Vertebrates: respiratory system
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Summary:To seek a method to reliably measure phrenic nerve conduction time (PNCT) with magnetic stimulation we investigated two stimulus sites, placing the magnetic coil at the cricoid cartilage (high position) or close to the clavicle (low position). We also compared compound muscle action potential (CMAP) recorded from three different sites: in the sixth to eighth intercostal spaces in the anterior axillary line (Ant-a); in the 8th intercostal space close to the midclavicular line; and with one electrode at the lower sternum and the other at the costal margin. Fourteen normal subjects were studied. The PNCT measured by magnetic stimulation in the high position recorded from (Ant-a) was 7.6±0.6 on the left side and 8.4±0.7 on the right. The PNCT recorded from all three sites become much shorter when the magnetic coil was moved from the high to the low position. Our results show that PNCT can be accurately measured with magnetic stimulation when care is taken to avoid coactivation of the brachial plexus.
ISSN:1569-9048
1878-1519
DOI:10.1016/S0034-5687(02)00010-5