Indirect estimation of laryngeal resistance via airflow redirection

Adam L. Rieves, Matthew R. Hoffman, Jack J. Jiang

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


Objectives: Our aim was to estimate aerodynamic parameters of laryngeal resistance (RL) and aerodynamic power indirectly from a subglottal pressure (Ps) data trace obtained with the airflow redirection system. Methods: During airflow interruption, the airflow redirection tank fills capacitively with pressure until it reaches the subject's Ps. Therefore, a time constant, ?, can be extracted from the data trace and used to calculate RL. The validity of applying this method to the estimation of RL was demonstrated with a computer model. Estimations were made for values of 10, 20, 30, 40, and 50 cm H2O per liter per second (L/s). Twenty subjects performed 10 trials on the experimental system designed to measure Ps. The values of RL and aerodynamic power were then calculated. Results: The computer model simulation yielded a maximum measurement error of 3.00% and a mean error of 1.78%. In human subject testing, the mean ± SD laryngeal resistance was 22.61 ± 8.65 cm H2O per L/s, the mean Ps was 6.91 ± 1.94 cm H2O, and the mean aerodynamic power was 0.247 ± 0.170 kPa × (L/s). Conclusions: The proposed method of data analysis enables a clinician to estimate RL and aerodynamic power from a single experimental trial designed to measure Ps. This technique provides the clinician with an aerodynamic function report that can be used to analyze patient health and treatment efficacy.

Original languageEnglish
Pages (from-to)124-130
Number of pages7
JournalAnnals of Otology, Rhinology and Laryngology
Issue number2
StatePublished - Feb 2009


  • Aerodynamic power
  • Airflow redirection
  • Laryngeal resistance
  • Subglottal pressure


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