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Chen-chi Wang - One of the best experts on this subject based on the ideXlab platform.

Dinesh K. Chhetri - One of the best experts on this subject based on the ideXlab platform.

  • Superior Laryngeal Nerve injury: effects, clinical findings, prognosis, and management options.
    Current opinion in otolaryngology & head and neck surgery, 2014
    Co-Authors: Michael I. Orestes, Dinesh K. Chhetri
    Abstract:

    Purpose of reviewThe Superior Laryngeal Nerve (SLN) provides motor innervation to the cricothyroid muscle. However, the functions of this muscle and the anatomic variations of the Nerve that supplies it are not fully understood. SLN paresis and paralysis (SLNp) is difficult to diagnose because of a

  • effects of asymmetric Superior Laryngeal Nerve stimulation on glottic posture acoustics vibration
    Laryngoscope, 2013
    Co-Authors: Dinesh K. Chhetri, Juergen Neubauer, Jennifer L. Bergeron, Elazar Sofer, Kevin A. Peng, Nausheen Jamal
    Abstract:

    Objectives/Hypothesis: Evaluate the effects of asymmetric Superior Laryngeal Nerve stimulation on the vibratory phase, Laryngeal posture, and acoustics. Study Design: Basic science study using an in vivo canine model. Methods: The Superior Laryngeal Nerves were symmetrically and asymmetrically stimulated over eight activation levels to mimic Laryngeal asymmetries representing various levels of Superior Laryngeal Nerve paresis and paralysis conditions. Glottal posture change, vocal fold speed, and vibration of these 64 distinct Laryngeal-activation conditions were evaluated by high speed video and concurrent acoustic and aerodynamic recordings. Assessments were made at phonation onset. Results: Vibratory phase was symmetric in all symmetric activation conditions, but consistent phase asymmetry toward the vocal fold with higher Superior Laryngeal-Nerve activation was observed. Superior Laryngeal Nerve paresis and paralysis conditions had reduced vocal fold strain and fundamental frequency. Superior Laryngeal Nerve activation increased vocal fold closure speed, but this effect was more pronounced for the ipsilateral vocal fold. Increasing asymmetry led to aperiodic and chaotic vibration. Conclusions: This study directly links vocal-fold tension asymmetry with vibratory phase asymmetry, in particular the side with greater tension leads in the opening phase. The clinical observations of vocal fold lag, reduced vocal range, and aperiodic voice in Superior Laryngeal paresis and paralysis is also supported.

  • Effects of asymmetric Superior Laryngeal Nerve stimulation on glottic posture, acoustics, vibration
    The Laryngoscope, 2013
    Co-Authors: Dinesh K. Chhetri, Juergen Neubauer, Jennifer L. Bergeron, Elazar Sofer, Kevin A. Peng, Nausheen Jamal
    Abstract:

    Evaluate the effects of asymmetric Superior Laryngeal Nerve stimulation on the vibratory phase, Laryngeal posture, and acoustics. Basic science study using an in vivo canine model. The Superior Laryngeal Nerves were symmetrically and asymmetrically stimulated over eight activation levels to mimic Laryngeal asymmetries representing various levels of Superior Laryngeal Nerve paresis and paralysis conditions. Glottal posture change, vocal fold speed, and vibration of these 64 distinct Laryngeal-activation conditions were evaluated by high speed video and concurrent acoustic and aerodynamic recordings. Assessments were made at phonation onset. Vibratory phase was symmetric in all symmetric activation conditions, but consistent phase asymmetry toward the vocal fold with higher Superior Laryngeal-Nerve activation was observed. Superior Laryngeal Nerve paresis and paralysis conditions had reduced vocal fold strain and fundamental frequency. Superior Laryngeal Nerve activation increased vocal fold closure speed, but this effect was more pronounced for the ipsilateral vocal fold. Increasing asymmetry led to aperiodic and chaotic vibration. This study directly links vocal-fold tension asymmetry with vibratory phase asymmetry, in particular the side with greater tension leads in the opening phase. The clinical observations of vocal fold lag, reduced vocal range, and aperiodic voice in Superior Laryngeal paresis and paralysis is also supported. Copyright © 2013 The American Laryngological, Rhinological and Otological Society, Inc.

  • videostroboscopic findings in unilateral Superior Laryngeal Nerve paralysis and paresis
    Otolaryngology-Head and Neck Surgery, 2007
    Co-Authors: Veling Tsai, Andrew W Celmer, Gerald S Berke, Dinesh K. Chhetri
    Abstract:

    Objectives Our aim was to present laryngovideostroboscopic findings in unilateral Superior Laryngeal Nerve paresis and paralysis. Study Design and Setting Retrospective case review, academic voice clinic. Methods Blinded retrospective review of videostroboscopic recordings from cases confirmed by Laryngeal electromyography. Results Three cases of unilateral Superior Laryngeal Nerve paresis and paralysis were identified. At rest, there were no common abnormal Laryngeal findings. Upon phonation, common findings were ipsilateral vocal fold bowing and shortening, vocal process height asymmetry with the ipsilateral vocal process overriding the normal, and ipsilateral hyperadduction of the false vocal fold. Conclusions The common features noted in these cases of Laryngeal electromyography−proved uSLNp could be used to make a presumptive diagnosis of this disorder.

Armando De Virgilio - One of the best experts on this subject based on the ideXlab platform.

Ching-ping Wang - One of the best experts on this subject based on the ideXlab platform.

Shih-an Liu - One of the best experts on this subject based on the ideXlab platform.