Document Detail

Vocal efficiency measurements in subjects with vocal polyps and nodules: a preliminary report.
MedLine Citation:
PMID:  15112969     Owner:  NLM     Status:  MEDLINE    
Vocal efficiency is a quantitative measure of the ability of the larynx to convert subglottal power to acoustic power. On the basis of the scant previous literature and clinical intuition, we tested the hypothesis that vocal efficiency, as an indicator of the functional status of the larynx, is abnormally reduced in persons with vocal nodules and polyps. Because the most difficult aspect of obtaining measures of vocal efficiency has been the determination of subglottal pressure, we applied a noninvasive airflow interruption technique for this purpose. Subjects with normal voices (n = 22), vocal polyps (n = 14), and vocal nodules (n = 16) phonated at different intensities into a mask connected by way of piping to a flow meter, a pressure transducer, and an acoustic microphone. Inflation of a balloon-type valve located within the piping provided interruption of phonation. The intraoral pressure plateau occurring during flow interruption was used to estimate subglottal pressure. Subglottal power and acoustic power were determined, and their quotient provided a measure of vocal efficiency. The vocal efficiency in the normal subjects averaged 1.15 x 10(-5) at 70 dB, 3.17 x 10(-5) at 75 dB, 7.52 x 10(-5) at 80 dB, and 1.41 x 10(-4) at 85 dB. The vocal efficiency in the patients with vocal polyps averaged 3.62 x 10(-6) at 70 dB, 8.34 x 10(-6) at 75 dB, 2.10 x 10(-5) at 80 dB, and 4.26 x 10(-5) at 85 dB. The vocal efficiency in the patients with vocal nodules averaged 4.32 x 10(-6) at 70 dB, 1.57 x 10(-5) at 75 dB, 4.26 x 10(-5) at 80 dB, and 8.34 x 10(-5) at 85 dB. As compared to the normal subjects, the patients with laryngeal polyps or vocal nodules had significantly reduced vocal efficiency. These results provide quantitative verification of the clinical impression of inefficient phonation in patients with mass lesions of the vocal folds.
Jack Jiang; Jennifer Stern; Hui-Jun Chen; Nancy Pearl Solomon
Related Documents :
23580629 - Changes in dynamic plantar pressure during loaded gait.
9840499 - Stress reaction to intense sound exposure under different arousal levels in guinea pigs.
1464569 - Intensity-dependent changes in oxygenation of cochlear perilymph during acoustic exposure.
16340219 - A centenary of auscultatory blood pressure measurement: a tribute to nikolai korotkoff.
6255729 - Calculation of noise dose from time distribution of sound levels.
8864769 - Effect of noise stress on some cardiovascular parameters and audiovisual reaction time.
1651859 - Changes in plasma potassium and neuromuscular blockade following suxamethonium in patie...
6992919 - Absence of blood-pressure lowering effect of captopril in anephric patients.
19661719 - Interaction of adipoq genetic polymorphism with blood pressure and plasma cholesterol l...
Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  The Annals of otology, rhinology, and laryngology     Volume:  113     ISSN:  0003-4894     ISO Abbreviation:  Ann. Otol. Rhinol. Laryngol.     Publication Date:  2004 Apr 
Date Detail:
Created Date:  2004-04-28     Completed Date:  2004-05-20     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0407300     Medline TA:  Ann Otol Rhinol Laryngol     Country:  United States    
Other Details:
Languages:  eng     Pagination:  277-82     Citation Subset:  AIM; IM    
Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, University of Wisconsin Medical School, Madison, Wisconsin 53706, USA.
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Laryngeal Neoplasms / physiopathology*
Polyps / physiopathology*
Vocal Cords / physiopathology*
Voice Disorders / diagnosis*
Grant Support

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

Previous Document:  Office-based treatment of glottal dysplasia and papillomatosis with the 585-nm pulsed dye laser and ...
Next Document:  Roof of the parapharyngeal space: defining its boundaries and clinical implications.