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    Electroglottogram approximate entropy: a novel single parameter for objective voice assessment.

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    Authors
    Douglas, Catriona Mairi
    Moore, Christopher J
    Manickam, Kathiresan
    Lee, Lip W
    Sykes, Andrew J
    Carr, A
    Jones, S
    Jones, Julie
    Swindell, Ric
    Homer, Jarrod J
    Slevin, Nicholas J
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    Affiliation
    Department of Head and Neck Surgery, Christie Hospital NHS Trust, Manchester, UK.
    Issue Date
    2010-05
    
    Metadata
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    Abstract
    BACKGROUND: The electroglottogram approximate entropy value is a numerical variable which gives an overall measure of voice quality. It is derived by analysing the complexity of the electroglottogram waveform using regulatory statistics. AIMS: (1) To use electroglottogram approximate entropy to measure voice quality in patients with glottic pathology and in normal subjects, to ascertain whether this parameter can distinguish between pathological and normal voices. (2) To ascertain whether electroglottogram approximate entropy can measure voice change over time within individual subjects. (3) To determine any correlation between electroglottogram approximate entropy and the grade-roughness-breathiness-asthenia-strain scale. METHODS: One hundred and forty-one normal volunteers were recruited to characterise electroglottogram approximate entropy in the normal voice. One hundred and eighty-six patients with glottic squamous cell carcinoma underwent electroglottogram approximate entropy measurement prior to radiotherapy and then three to six months and one year after treatment. Subjects' voices were categorised by a speech therapist using the grade-roughness-breathiness-asthenia-strain scale. RESULTS: The mean electroglottogram approximate entropy of the normal volunteers was 0.302 (range 0.05-0.42). The mean electroglottogram approximate entropy of the glottic squamous cell carcinoma patients was significantly lower prior to treatment, at 0.227 (range 0.001-0.397; p < 0.0005), but improved after radiotherapy to 0.277 at three to six months and 0.282 at one year. Electroglottogram approximate entropy results correlated significantly with grade-roughness-breathiness-asthenia-strain scale results. CONCLUSION: Electroglottogram approximate entropy can be used to assess change in voice quality resulting from glottic morphological abnormality. Electroglottogram approximate entropy values improve as voice quality improves after treatment. Electroglottogram approximate entropy values correlate significantly with grade-roughness-breathiness-asthenia-strain scale results.
    Citation
    Electroglottogram approximate entropy: a novel single parameter for objective voice assessment. 2010, 124 (5):520-8 J Laryngol Otol
    Journal
    The Journal of Laryngology and Otology
    URI
    http://hdl.handle.net/10541/109319
    DOI
    10.1017/S0022215109992787
    PubMed ID
    20128940
    Type
    Article
    Language
    en
    ISSN
    1748-5460
    ae974a485f413a2113503eed53cd6c53
    10.1017/S0022215109992787
    Scopus Count
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