Summary
Introduction
Vocal cord vibration after transoral CO2 LASER-guided thyroarytenoid (TA) myoneurectomy in adductor spasmodic dysphonia (AdSD)
patients is unclear to date. The precise vibratory patterns in AdSD patients are difficult
to evaluate with routine videolaryngostroboscopy. High-speed videolaryngoscopy (HSV)
is an ideal choice to evaluate such patients. This study was performed to compare
pre- and postoperative, after 6 months, vocal fold vibratory onset delay (VFVOD) and
closed phase glottal cycle (CPGC) in AdSD patients following transoral CO2 LASER-guided TA myoneurectomy using the HSV.
Materials and methods
Retrospective study, conducted from January, 2016 to January, 2019, of the AdSD patients
who underwent transoral CO2 LASER-guided TA myoneurectomy using the HSV. Patient data were acquired from the
hospital database to evaluate VFVOD and CPGC from HSV recordings of the patients.
VFVOD was calculated as sum of prephonatory delay (PPD) and steady-state delay (SSD).
The PPD and SSD were evaluated and compared separately for each patient. The MedCal Version 19.2.6 was used for data analysis. Paired sample t test was performed to compute the significance of the difference between the mean
of the dataset. A P value less than 0.05 was considered significant.
Results
A total of nine patients were included in the study, out of which three were females
and six were males. The average age was 45.5 ± 6.9 years. The mean of postoperative
PPD (166.8 ± 22.1), SSD (76.5 ± 8.6), and CPGC (62.6 ± 4.8) were significantly less
than mean of preoperative PPD (222.6 ± 22.1), SSD (97.7 ± 9.5), and CPGC (71.6 ± 5
%), with P values of 0.0007, 0.0001, and 0.0001, respectively.
Conclusions
There was a significant decrease in VFVOD and CPGC posttransoral CO2 LASER-guided TA myoneurectomy in AdSD patients after 6 months follow-up. This study
also establishes efficiency of the HSV to measure the vocal cord vibration in the
patients with AdSD. The primary limitations of the study were the small sample size
and its retrospective nature. Future prospective studies with increased sample size
can further substantiate the findings of the work performed here.
Key Words
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Article info
Publication history
Published online: October 03, 2020
Accepted:
September 14,
2020
Footnotes
There was no conflict of interest.
This research was fully supported by Laryngology Department of Deenanath Mangeshkar Hospital and Research Center.
This manuscript has been read and approved by all the authors and the requirements for authorship have been met. Each author approves that the manuscript represents original work.
Identification
Copyright
© 2020 The Voice Foundation. Published by Elsevier Inc. All rights reserved.
