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Characteristics of an In Vivo Canine Model of Phonation With a Constant Air Pressure Source
Author(s) -
Nasri Sina,
Namazie Ali,
Ye Ming,
Kreiman Jody,
Gerratt Bruce R.,
Berke Gerald S.
Publication year - 1996
Publication title -
the laryngoscope
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.181
H-Index - 148
eISSN - 1531-4995
pISSN - 0023-852X
DOI - 10.1097/00005537-199606000-00015
Subject(s) - phonation , constant (computer programming) , in vivo , acoustics , materials science , mathematics , physics , medicine , biology , audiology , computer science , microbiology and biotechnology , programming language
Many previous studies of laryngeal biomechanics using in vivo models have employed a constant air flow source. Several authors have recently suggested that the lung‐thorax system functions as a constant pressure source during phonation. This study describes an in vivo canine system designed to maintain a constant peak subglottic pressure (P sub ) using a pressure‐controlling mechanism. Increasing levels of recurrent laryngeal nerve (RLN) stimulation resulted in a significant rise in resistance followed by a plateau. For a given P sub , flow decreased significantly and precipitously with increasing stimulation and then quickly plateaued. Vocal intensity increased with increasing RLN stimulation until a peak was reached. After this peak, intensity dropped until a plateau was reached, corresponding to the flow minimum. At a given P sub , increasing levels of RLN stimulation resulted in a normal distribution of vocal efficiencies.