Differential diagnosis of muscle tension dysphonia and adductor spasmodic dysphonia using spectral moments of the long-term average spectrum

2010 ◽  
Vol 120 (4) ◽  
pp. 749-757 ◽  
Author(s):  
Daniel R. Houtz ◽  
Nelson Roy ◽  
Ray M. Merrill ◽  
Marshall E. Smith
Keyword(s):  
Differential Diagnosis ◽  
Muscle Tension ◽  
Spasmodic Dysphonia ◽  
Spectral Moments ◽  
Muscle Tension Dysphonia ◽  
Average Spectrum ◽  
Adductor Spasmodic Dysphonia

Toward Improved Differential Diagnosis of Adductor Spasmodic Dysphonia and Muscle Tension Dysphonia

2007 ◽  
Vol 59 (2) ◽  
pp. 83-90 ◽  
Author(s):  
Nelson Roy ◽  
Shannon C. Mauszycki ◽  
Ray M. Merrill ◽  
Manon Gouse ◽  
Marshall E. Smith
Keyword(s):  
Differential Diagnosis ◽  
Muscle Tension ◽  
Spasmodic Dysphonia ◽  
Muscle Tension Dysphonia ◽  
Adductor Spasmodic Dysphonia

Differential Diagnosis of Adductor Spasmodic Dysphonia and Muscle Tension Dysphonia Using Phonatory Break Analysis

2008 ◽  
Vol 118 (12) ◽  
pp. 2245-2253 ◽  
Author(s):  
Nelson Roy ◽  
Melissa Whitchurch ◽  
Ray M. Merrill ◽  
Daniel Houtz ◽  
Marshall E. Smith
Keyword(s):  
Differential Diagnosis ◽  
Muscle Tension ◽  
Spasmodic Dysphonia ◽  
Muscle Tension Dysphonia ◽  
Adductor Spasmodic Dysphonia

Phonatory Air Flow Characteristics of Adductor Spasmodic Dysphonia and Muscle Tension Dysphonia

1999 ◽  
Vol 42 (1) ◽  
pp. 101-111 ◽  
Author(s):  
Maureen B. Higgins ◽  
David H. Chait ◽  
Laura Schulte
Keyword(s):  
Air Flow ◽  
Muscle Tension ◽  
Flow Characteristics ◽  
Spasmodic Dysphonia ◽  
Potential Contribution ◽  
Intrasubject Variability ◽  
Muscle Tension Dysphonia ◽  
Adductor Spasmodic Dysphonia ◽  
Coefficients Of Variation ◽  
Significant Difference

The purpose of this study was to determine if phonatory air flow characteristics differed among women with adductor spasmodic dysphonia (AdSD), muscle tension dysphonia (MTD), and normal phonation. Phonatory air flow signals were gathered during [pα] syllable repetitions. Mean phonatory air flow, coefficients of variation, and the presence of large air flow perturbations (75 ml/s or more) were examined for the three groups of speakers. There was no significant difference in mean phonatory air flow across groups, and very large intersubject variation in mean phonatory air flow occurred for both the AdSD and MTD groups. Coefficients of variation were similar for the groups of women with MTD and normal phonation but were significantly larger for the group with AdSD. Air flow perturbations were common with AdSD and rare with MTD. Relatively large coefficients of variation and air flow perturbations of at least 75 ml/s did occur for some women with normal voices who were 70 years of age or older. It appears that intrasubject variability in phonatory air flow may aid in the differentiation of AdSD and MTD when used in conjunction with other elements of a thorough voice evaluation. However, the potential contribution of aging to increased intrasubject variability in phonatory air flow must be considered when interpreting findings.

scholarly journals Long-term Follow-up of Patients with Spasmodic Dysphonia Repeatedly Treated with Botulinum Toxin Injections

2011 ◽  
Vol 1 (2) ◽  
pp. 57-60 ◽  
Author(s):  
PH Dejonckere ◽  
C Manfredi
Keyword(s):  
Botulinum Toxin ◽  
Acoustic Analysis ◽  
Botulinum Toxin Injection ◽  
Muscle Tension ◽  
Voice Quality ◽  
Spasmodic Dysphonia ◽  
Long Term Effects ◽  
Adductor Spasmodic Dysphonia ◽  
Over Time

ABSTRACT Adductor spasmodic dysphonia (SD) is a focal laryngeal dystonia mainly resulting in a strained voice quality with spastic voice breaks and frequency shifts, perturbing fluency and intelligibility. SD-patients report unusually high impairment of their quality of life. The standard treatment is botulinum toxin injection in the thyroarytenoid muscles, in order to interfere with the perturbed sensory feedback loop of kinetic muscle tension regulation. The globally favorable effects are temporary, but the botulinum injections can be repeated. There is a lack of information about long-term effects. This is the first study investigating effects over several years, and comparing self-evaluation of patients with objective multimodal acoustic analysis. Results show that 72% of the individual injections are successful. The effects of botulinum are not reduced after repeated injections. In contrary, the self-perceived improvement increases in average over time. When self-evaluations preinjection are considered, patients tend to evaluate their voice and their handicap as worsening over time. This contrasts with the results of multimodal acoustic analysis. Objective data reveal a relative stability over time for as well pre- as postinjection. This seems to indicate that there is no shift over time in the objective severity of deviance in voice quality.

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