| Differentiating between adductor and abductor spasmodic dysphonia using airflow interruption. | |
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MedLine Citation:
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PMID: 19554636 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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OBJECTIVES/HYPOTHESIS: To measure the laryngeal resistance (R(L)), subglottal pressure (P(s)), and mean flow rate (MFR) of adductor (ADSD) and abductor (ABSD) spasmodic dysphonia patients using the airflow interrupter. METHODS: The R(L) of six ABSD and seven ADSD patients was measured using the airflow interrupter, a noninvasive device designed to measure MFR and P(s) via mechanical balloon valve interruption. Subjects performed 10 trials at each of two intensity levels, with each trial consisting of a sustained /a/ during which phonation was interrupted for 500 ms. Laryngeal resistance was calculated as subglottal pressure divided by airflow. RESULTS: Mean R(L) for the ADSD and ABSD subtypes at 65 dB were 24.78 cmH(2)O/L/s and 14.51 cmH(2)O/L/s, respectively (P = .04). Mean R(L) at 70 dB were 40.02 cmH(2)O/L/s and 15.84 cmH(2)O/L/s (P = .014). P(s) for the ADSD and ABSD subtypes at 65 dB were 10.23 cmH(2)O and 8.32 cmH(2)O, respectively (P = .582). At the 70 dB level, P(s) were 12.39 cmH(2)O and 11.78 cmH(2)O (P = .886). MFR for the ADSD and ABSD subtypes at 65 dB were 435 mL/s and 746 mL/s (P = .205). Mean MFR at 70 dB were 518 mL/s and 848 mL/s (P = .198). CONCLUSIONS: Noninvasive measurements of R(L) may be useful for differentiating between ADSD and ABSD. This simple objective test, which produces a quantitative output, could be used to evaluate laryngeal function in patients with spasmodic dysphonia. |
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Authors:
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Matthew R Hoffman; Jack J Jiang; Adam L Rieves; Kelsey A B McElveen; Charles N Ford |
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Publication Detail:
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Type: Journal Article; Research Support, N.I.H., Extramural |
Journal Detail:
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Title: The Laryngoscope Volume: 119 ISSN: 1531-4995 ISO Abbreviation: Laryngoscope Publication Date: 2009 Sep |
Date Detail:
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Created Date: 2009-09-02 Completed Date: 2010-03-04 Revised Date: 2010-12-28 |
Medline Journal Info:
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Nlm Unique ID: 8607378 Medline TA: Laryngoscope Country: United States |
Other Details:
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Languages: eng Pagination: 1851-5 Citation Subset: IM |
Affiliation:
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Department of Surgery, Division of Otolaryngology-Head and Neck Surgery, University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Acoustics Dysphonia / diagnosis*, physiopathology Glottis / physiology Humans Larynx / physiopathology Otolaryngology / methods Phonation / physiology |
| Grant Support | |
ID/Acronym/Agency:
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R01 DC008153/DC/NIDCD NIH HHS; R01 DC008153-02/DC/NIDCD NIH HHS |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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