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The effects of Cricothyroid Visor Maneuver (CVM) therapy on the voice characteristics of patients with muscular tension dysphonia: A Case Series Study

      Summary

      Objective

      The purpose of this study was to assess the effects of a novel manual therapy, the Cricothyroid visor maneuver (CVM) therapy, on acoustic, auditory perceptual and self-assessment ratings in Muscle tension dysphonia (MTD) patients.

      Study design

      This was a retrospective study of 6 clinical cases.

      Materials and Method

      The study comprised 6 Persian speakers with MTD (2 men and 4 women) and mean age 38.50 ± 5.32 years. All patients underwent therapy between April and June 2021. Therapy was provided in five 30-minute sessions. This study used of acoustic measurement including smoothed cepstral peak prominence (CPPs), Dysphonia Severity Index (DSI), self-assessment scales include vocal tract discomfort scale (VTD), voice related quality of life (V-RQOL) and Consensus Auditory- Perceptual Evaluation of Voice (CAPE-V) for auditory perceptual assessment in pre- and post-CVM sessions.

      Results

      In the present study the CPPs and DSI increased while only CPPs significantly changed in pre and post therapy (P < 0.05). Also, having done the therapy the total severity of dysphonia (CAPE-V) and VTD significantly decreased (P < 0.05) and V-RQOL significantly increased (P < 0.05).

      Conclusions

      These results suggest that CVM can be an effective method for promote significant improvements in acoustic measurements, auditory perceptual and self-assessment scales in patients with MTD.

      Key Words

      Abbreviation:

      MTD (Muscle tension dysphonia), CVM (Cricothyroid visor maneuver), MCT (manual circumlaryngeal therapy), LMT (laryngeal manual therapy), VFTs (vocal facilitating techniques), CPPs (smoothed cepstral peak prominence), DSI (Dysphonia Severity Index), CAPE-V (Consensus Auditory-perceptual Evaluation of Voice), VTD (vocal tract discomfort scale), V-RQOL (voice related quality of life), MPT (maximum phonation time)
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