Destruction of Vowel Space Area in Patients with Dysphagia after Stroke

Min Kyu Choi, Seung Don Yoo and Eo Jin Park ()
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Min Kyu Choi: Department of Rehabilitation Medicine, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea
Seung Don Yoo: Department of Rehabilitation Medicine, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea
Eo Jin Park: Department of Rehabilitation Medicine, Kyung Hee University Hospital at Gangdong, Seoul 05278, Korea

IJERPH, 2022, vol. 19, issue 20, 1-7

Abstract: Dysphagia is associated with dysarthria in stroke patients. Vowel space decreases in stroke patients with dysarthria; destruction of the vowel space is often observed. We determined the correlation of destruction of acoustic vowel space with dysphagia in stroke patients. Seventy-four individuals with dysphagia and dysarthria who had experienced stroke were enrolled. For /a/, /ae/, /i/, and /u/ vowels, we determined formant parameter (it reflects vocal tract resonance frequency as a two-dimensional coordinate point), formant centralization ratio (FCR), and quadrilateral vowel space area (VSA). Swallowing function was assessed using the videofluoroscopic dysphagia scale (VDS) during videofluoroscopic swallowing studies. Pearson’s correlation and linear regression were used to determine the correlation between VSA, FCR, and VDS. Subgroups were created based on VSA; vowel space destruction groups were compared using ANOVA and Scheffe’s test. VSA and FCR were negatively and positively correlated with VDS, respectively. Groups were separated based on mean and standard deviation of VSA. One-way ANOVA revealed significant differences in VDS, FCR, and age between the VSA groups and no significant differences in VDS between mild and moderate VSA reduction and vowel space destruction groups. VSA and FCR values correlated with swallowing function. Vowel space destruction has characteristics similar to VSA reduction at a moderate-to-severe degree and has utility as an indicator of dysphagia severity.

Keywords: destruction of vowel space; dysphagia; dysarthria; stroke (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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