ISSN:
1432-1238
Schlagwort(e):
Key words Lung
;
Continuous positive airway pressure
;
Laryngeal muscles
;
Cricothyroid
;
Posterior cricoarytenoid
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Medizin
Notizen:
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 expiratory 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.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF01709524
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