Key result
Lung volume changes increase diaphragm EMG amplitude while small esophageal electrode displacements cause substantial changes.
Why the study?
The influence of lung volume and electrode position on diaphragm electromyography signals was not well characterized.
Population
Cats anesthetized with Nembutal
Comparison
Electromyography recordings from esophageal electrode, paratendinous hooks, and peripheral costal hooks and clips at different lung volumes
Design
Preclinical experimental study
Authors
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Animal data on lung volume effects on Edi require human validation; leaves open optimal electrode placement for clinical diaphragm monitoring.
In a feline model, lung volume changes and electrode displacement significantly affect the amplitude of diaphragmatic electromyograms depending on the electrode type and position.
Grassino et al. (1976) studied this question. Changes in lung volume and electrode position was evaluated on Amplitude of muscle potentials and relationship to transdiaphragmatic pressure. Changes in lung volume increased the amplitude of diaphragm electromyography potentials recorded from peripheral hooks and clips, while small esophageal electrode displacements caused substantial changes.
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