R427 – Mechanism Producing Subglottic Air Pressure While Swallowing

Autor: Libby J. Smith, Slivka William, Ricardo L. Carrau, Roxanne D Gross
Rok vydání: 2008
Předmět:
Zdroj: Otolaryngology–Head and Neck Surgery. 139
ISSN: 1097-6817
0194-5998
DOI: 10.1016/j.otohns.2008.05.582
Popis: ProblemThe importance of positive subglottic air pressure during swallowing has been recognized, yet no experiment has sought to determine the mechanism that generates this pressure. We hypothesized that transpulmonary recoil forces are responsible for this pressure. Objective: To compare direct subglottic air pressure measurements obtained while swallowing at different lung volumes with airway pressures obtained by total respiratory system recoil measurements.MethodsDirect measurement of subglottic air pressure during swallowing was obtained via a percutaneous puncture of the cricothyroid membrane. Tidal volumes were measured via a heated pneumotachometer as the subjects breathed through a nasal mask. Next, to model swallowing, airway pressures were measured at the mouth by occluding the airflow for a duration consistent with true vocal fold closure during swallowing. Passive exhalation was used to mimic the central inhibition of respiratory muscles that occurs during the swallow.ResultsRegression analys...
Databáze: OpenAIRE
Externí odkaz: