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Diaphragm electromyograms recorded from multiple surface electrodes following magnetic stimulation
J C Glerant1, N Mustfa, W D Man
1Respiratory Muscle Laboratory, King's College London School of Medicine, King's College Hospital, London, UK.
The European Respiratory Journal
|February 3, 2006
Summary
Reproducible diaphragm compound-muscle action potential (CMAPdi) signals can be obtained using surface electrodes. Optimizing electrode placement through multiple chest wall recordings ensures reliable CMAPdi measurements for phrenic nerve studies.
Area of Science:
- Neurology
- Physiology
- Biomedical Engineering
Background:
- Diaphragm compound-muscle action potential (CMAPdi) assessment is crucial for evaluating phrenic nerve function.
- Current methods lack standardized electrode positioning and reproducibility data for CMAPdi.
- Unilateral magnetic stimulation (UMS) offers a non-invasive approach to elicit CMAPdi.
Purpose of the Study:
- To investigate the reproducibility of CMAPdi signals elicited by UMS.
- To identify optimal surface electrode configurations for reliable CMAPdi recording.
- To compare CMAPdi parameters obtained via UMS and electrical stimulation (ES).
Main Methods:
- Compared CMAPdi elicited by UMS and ES using 36 surface electrode pairs in healthy subjects.
- Identified 12 electrode pairs yielding acceptable CMAPdi signals.
- Measured latency and amplitude of CMAPdi from optimal sites on two separate occasions in 12 subjects.
Main Results:
- Optimal CMAPdi recording sites varied between subjects and hemidiaphragms.
- Optimal recording sites remained consistent for individual subjects across testing sessions.
- CMAPdi latencies and amplitudes showed no significant differences between the two testing occasions when recorded from optimal sites.
Conclusions:
- Multiple chest wall electrodes can identify optimal sites for reproducible CMAPdi signals.
- UMS provides a reliable method for assessing CMAPdi when optimal electrode placement is determined.
- Standardizing electrode positioning is key for consistent phrenic nerve function assessment.