Abstract
Objectives
We investigated the effect of different levels of continuous positive airway pressure (CPAP) on the cricothyroid (CT; a tensor muscle of the vocal folds) and posterior cricoarytenoid (PCA; sole abductor muscle of the vocal folds) muscles in dogs.
Design
Prospective, controlled animal study.
Subjects
Nine mongrel dogs of both sexes.
Setting
University research laboratory.
Interventions
After insertion of a cuffed tracheotomy tube low in the neck the compound EMG responses of the CT and PCA muscles during spontaneous respiration were measured simultaneously under different levels (2, 4, 6, and 8 cmH2O) of positive end-expiratory pressure (PEEP).
Measurements and results
The CT showed a progressive increase in phasic expiratory EMG activity with the application of graded levels of PEEP. Application of PEEP over 4 cmH2O produced significant increases in the phasic CT activity (P<0.05). In contrast to the CT, the PCA failed to increase phasic inspiratory EMG activity statistically until a 8 cmH2O of PEEP was applied (P<0.05). The phasic experatory CT and inspiratory PCA activities were 297.9±77.6 and 124.5±22.9, respectively, at the application of 6 cmH2O of PEEP (percentage of control, mean±SD).
Conclusion
This study confirms the difference in sensitivity between adductor and abductor laryngeal muscles, demonstrating that the intrinsic laryngeal muscles do not all behave similarly after the application of CPAP.
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Iwasaki, H., Ohmori, H., Sumita, S. et al. Influence of continuous positive airway pressure on EMG activities of the cricothyroid and posterior cricoarytenoid muscles of the canine larynx. Intensive Care Med 22, 805–808 (1996). https://doi.org/10.1007/BF01709524
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DOI: https://doi.org/10.1007/BF01709524