scholarly journals Numerical and Experimental Investigations on Vocal Fold Approximation in Healthy and Simulated Unilateral Vocal Fold Paralysis

2021 ◽  
Vol 11 (4) ◽  
pp. 1817
Author(s):  
Zheng Li ◽  
Azure Wilson ◽  
Lea Sayce ◽  
Amit Avhad ◽  
Bernard Rousseau ◽  
...  
Keyword(s):  
Computational Model ◽  
Vocal Fold ◽  
High Speed ◽  
Computational Models ◽  
Ex Vivo ◽  
Vocal Fold Paralysis ◽  
Future Application ◽  
Experimental Investigations ◽  
Type I ◽  
Mri Scans

We have developed a novel surgical/computational model for the investigation of unilat-eral vocal fold paralysis (UVFP) which will be used to inform future in silico approaches to improve surgical outcomes in type I thyroplasty. Healthy phonation (HP) was achieved using cricothyroid suture approximation on both sides of the larynx to generate symmetrical vocal fold closure. Following high-speed videoendoscopy (HSV) capture, sutures on the right side of the larynx were removed, partially releasing tension unilaterally and generating asymmetric vocal fold closure characteristic of UVFP (sUVFP condition). HSV revealed symmetric vibration in HP, while in sUVFP the sutured side demonstrated a higher frequency (10–11%). For the computational model, ex vivo magnetic resonance imaging (MRI) scans were captured at three configurations: non-approximated (NA), HP, and sUVFP. A finite-element method (FEM) model was built, in which cartilage displacements from the MRI images were used to prescribe the adduction, and the vocal fold deformation was simulated before the eigenmode calculation. The results showed that the frequency comparison between the two sides was consistent with observations from HSV. This alignment between the surgical and computational models supports the future application of these methods for the investigation of treatment for UVFP.

Biomechanics of Arytenoid Adduction Surgery in an Ex Vivo Canine Model

1998 ◽  
Vol 107 (6) ◽  
pp. 454-461 ◽  
Author(s):  
J. Pieter Noordzij ◽  
Donald F. Perrault ◽  
Peak Woo
Keyword(s):  
Vocal Fold ◽  
Ex Vivo ◽  
Canine Model ◽  
Vocal Fold Paralysis ◽  
Lateral Movement ◽  
Arytenoid Adduction ◽  
Vocal Process ◽  
Process Procedures ◽  
Suture Tension

The biomechanics of arytenoid adduction surgery are not well understood. An excised canine larynx model was used to study the effects of variable suture tension on glottal configuration and on vocal fold tension (at the midfold and the vocal process). Arytenoid adduction both medializes the vocal fold and closes a posterior glottal chink. Vocal fold tension at the midfold did not vary significantly with suture tension. As suture tension increased to approximately 100 g, vocal fold tension at the vocal process also increased. Beyond 100 g of suture tension, vocal fold tension at the vocal process did not increase. We conclude that the effects of suture tension on the resistance to lateral movement are different at the midfold compared to the vocal process. Procedures for surgical rehabilitation of vocal fold paralysis should address the biomechanical subunits of the larynx individually in order to achieve optimum results.

Vocal Evaluation of Thyroplasty Type I in the Treatment of Nonparalytic Glottic Incompetence

1998 ◽  
Vol 107 (2) ◽  
pp. 113-119 ◽  
Author(s):  
Fang-Ling Lu ◽  
Donna S. Lundy ◽  
Roy R. Casiano ◽  
Jun-Wu Xue
Keyword(s):  
Vocal Fold ◽  
Vocal Folds ◽  
Vocal Fold Paralysis ◽  
Perceptual Judgment ◽  
Function Evaluation ◽  
Type I ◽  
Unilateral Vocal Fold Paralysis ◽  
Vocal Function ◽  
Voice Outcome ◽  
Minimal Improvement

This study investigated the prethyroplasty and postthyroplasty voices of patients with glottic incompetence of mobile vocal folds related to vocal fold bowing and scarring. Seventeen patients underwent vocal function evaluation preoperatively and 1 month postoperatively with videostrobolaryngoscopic examination, acoustic and aerodynamic analysis, and perceptual judgment of voice characteristics. The postoperative voice outcome in this group of patients was compared to that of a group of patients with unilateral vocal fold paralysis. Patients with vocal fold bowing showed significant improvement in glottic gap size and hoarseness after the surgery. There was minimal improvement on other test measures. Patients with vocal fold scarring exhibited worse preoperative and postoperative vocal functions, with little voice improvement after surgery. The outcome of thyroplasty type I in cases of vocal fold bowing or scarring is not as good as that in unilateral vocal fold paralysis.

Three-Dimensional MRI Evaluation of Vocal Fold Paralysis after Type I Thyroplasty

1995 ◽  
Vol 113 (2) ◽  
pp. P133-P133
Author(s):  
Nancy Jones Bryant ◽  
L. Carol Gracco ◽  
Clarence T. Sasaki ◽  
John C. Gore
Keyword(s):  
Vocal Fold ◽  
Three Dimensional ◽  
Vocal Fold Paralysis ◽  
Type I ◽  
Mri Evaluation ◽  
Type I Thyroplasty

Empirical Eigenfunctions and Medial Surface Dynamics of a Human Vocal Fold

2005 ◽  
Vol 44 (03) ◽  
pp. 384-391 ◽  
Author(s):  
N. Tayama ◽  
D. A. Berry ◽  
M. Döllinger
Keyword(s):  
Vocal Fold ◽  
High Speed ◽  
Computational Models ◽  
Imaging System ◽  
Vocal Folds ◽  
Sustained Oscillation ◽  
Medial Surface ◽  
Physical Mechanisms ◽  
Vocal Fold Vibration ◽  
Modes Of Vibration

Summary Objectives: The purpose of this investigation was to use an excised human larynx to substantiate physical mechanisms of sustained vocal fold oscillation over a variety of phonatory conditions. During sustained, flow-induced oscillation, dynamical data was collected from the medial surface of the vocal fold. The method of Empirical Eigenfunctions was used to analyze the data and to probe physical mechanisms of sustained oscillation. Methods: Thirty microsutures were mounted on the medial margin of a human vocal fold. Across five distinct phonatory conditions, the vocal fold was set into oscillation and imaged with a high-speed digital imaging system. The position coordinates of the sutures were extracted from the images and converted into physical coordinates. Empirical Eigenfunctions were computed from the time-varying physical coordinates, and mechanisms of sustained oscillation were explored. Results: Using the method of Empirical Eigenfunctions, physical mechanisms of sustained vocal fold oscillation were substantiated. In particular, the essential dynamics of vocal fold vibration were captured by two dominant Empirical Eigenfunctions. The largest Eigenfunction primarily captured the alternating convergent/ divergent shape of the medial surface of the vocal fold, while the second largest Eigenfunction primarily captured the lateral vibrations of the vocal fold. Conclusions: The hemi-larynx setup yielded a view of the medial surface of the vocal folds, revealing the tissue vibrations which produced sound. Through the use of Empirical Eigenfunctions, the underlying modes of vibration were computed, disclosing physical mechanisms of sustained vocal fold oscillation. The investigation substantiated previous theoretical analyses and yielded significant data to help evaluate and refine computational models of vocal fold vibration.

Type I Thyroplasty for Acute Unilateral Vocal Fold Paralysis following Intrathoracic Surgery

2002 ◽  
Vol 111 (8) ◽  
pp. 667-671 ◽  
Author(s):  
Manoj T. Abraham ◽  
Manjit S. Bains ◽  
Robert J. Korst ◽  
Robert J. Downey ◽  
Dennis H. Kraus
Keyword(s):  
Thoracic Surgery ◽  
Vocal Fold ◽  
High Risk Patient ◽  
Primary Lung Cancer ◽  
Vocal Fold Paralysis ◽  
Common Disease ◽  
Type I ◽  
Pulmonary Status ◽  
Type I Thyroplasty ◽  
Intrathoracic Surgery

Patients who undergo intrathoracic operative procedures for malignancy may require sacrifice of a recurrent laryngeal nerve. Postoperative vocal fold paralysis may lead to diminished cough with secretion retention, aspiration, and life-endangering pneumonia. This study retrospectively reviews our institution's experience of 23 patients who underwent type I thyroplasty within the 2-week (acute) period after thoracic surgery. Primary lung cancer (n = 16) was the most common disease. Upper lobectomy (n = 9) and pneumonectomy (n = 7) were the most frequent surgical procedures. Silicone medialization alone (n = 11) or with arytenoid adduction (n = 12) was performed. There were no significant postoperative complications. Improvements in hoarseness (86%), dyspnea (72%), dysphagia (50%), and aspiration (79%) were noted. Pulmonary status improved after vocal fold medialization, as reflected by decreased need for therapeutic bronchoscopy in the majority of patients in the postoperative period. Type I thyroplasty for vocal fold paralysis in the acute phase following thoracic surgery is well tolerated and is associated with improved patient outcome with no postoperative deaths in this high-risk patient population.

Quantitative Analysis of Vocal Fold Vibration in Vocal Fold Paralysis With the Use of High-speed Digital Imaging

2016 ◽  
Vol 30 (6) ◽  
pp. 766.e13-766.e22 ◽  
Author(s):  
Akihito Yamauchi ◽  
Hisayuki Yokonishi ◽  
Hiroshi Imagawa ◽  
Ken-Ichi Sakakibara ◽  
Takaharu Nito ◽  
...  
Keyword(s):  
Quantitative Analysis ◽  
Digital Imaging ◽  
Vocal Fold ◽  
High Speed ◽  
Vocal Fold Paralysis ◽  
Vocal Fold Vibration

MRI Evaluation of Vocal Fold Paralysis Before and After Type I Thyroplasty

1996 ◽  
Vol 106 (11) ◽  
pp. 1386-1392 ◽  
Author(s):  
Nancy Jones Bryant ◽  
L. Carol Gracco ◽  
Clarence T. Sasaki ◽  
Eugenia Vining
Keyword(s):  
Vocal Fold ◽  
Vocal Fold Paralysis ◽  
Type I ◽  
Before And After ◽  
Mri Evaluation ◽  
Type I Thyroplasty

Correlation between Functional MRI And Voice Improvement Following Type I Thyroplasty in Unilateral Vocal Fold Paralysis—A Case Study

2009 ◽  
Vol 23 (5) ◽  
pp. 639-645 ◽  
Author(s):  
Jessica F. Galgano ◽  
Kyung K. Peck ◽  
Ryan C. Branski ◽  
Dmitry Bogomolny ◽  
David Mener ◽  
...  
Keyword(s):  
Functional Mri ◽  
Vocal Fold ◽  
Vocal Fold Paralysis ◽  
Type I ◽  
Unilateral Vocal Fold Paralysis ◽  
Type I Thyroplasty

Analysis of Pitch Range After Arytenoid Adduction by Fenestration Approach Combined With Type I Thyroplasty for Unilateral Vocal Fold Paralysis

2012 ◽  
Vol 26 (6) ◽  
pp. 792-796 ◽  
Author(s):  
Ryoji Tokashiki ◽  
Hiroyuki Hiramatsu ◽  
Eriko Shinada ◽  
Ray Motohashi ◽  
Masaski Nomoto ◽  
...  
Keyword(s):  
Vocal Fold ◽  
Vocal Fold Paralysis ◽  
Type I ◽  
Unilateral Vocal Fold Paralysis ◽  
Pitch Range ◽  
Arytenoid Adduction ◽  
Type I Thyroplasty

scholarly journals Complications of Medialization Laryngoplasty (Thyroplasty Type-I)

2011 ◽  
Vol 1 (1) ◽  
pp. 1-3 ◽  
Author(s):  
S Kartha ◽  
K Young ◽  
S Mohan
Keyword(s):  
Study Design ◽  
Vocal Fold ◽  
Vocal Fold Paralysis ◽  
Type I ◽  
Unilateral Vocal Fold Paralysis ◽  
Extrusion Rate ◽  
Female Patients ◽  
Removal Technique ◽  
Medialization Laryngoplasty

ABSTRACT Objective Medialization laryngoplasty (formally type 1 thyroplasty) is an accepted treatment for unilateral vocal fold paralysis or paresis. The objective of this paper is to ascertain the complications following medialization laryngoplasty in patients with particular reference to implant extrusion. Study design The records of 85 patients who underwent medialization laryngoplasty were retrospectively reviewed from January 2001 to July 2009. Results There were 3 implant extrusions noted only in female patients with cartilage removal technique. Conclusions Implant extrusion rate following medialization laryngoplasty in our institution is comparable to published literature.

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