The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report
This paper describes the swallowing difficulty and abnormal voicing characteristics of a subject with pharyngeal dystonia. This rare form of dystonia, considered to be a neurological condition resulting in involuntary spasm of the muscles of the pharynx, has not been documented in terms of its effec...
| Main Authors: | , |
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| Format: | Article |
| Language: | English |
| Published: |
AOSIS
2001-12-01
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| Series: | South African Journal of Communication Disorders |
| Subjects: | |
| Online Access: | https://sajcd.org.za/index.php/sajcd/article/view/734 |
| _version_ | 1811292354311618560 |
|---|---|
| author | Loren Kahn Heila Jordaan |
| author_facet | Loren Kahn Heila Jordaan |
| author_sort | Loren Kahn |
| collection | DOAJ |
| description | This paper describes the swallowing difficulty and abnormal voicing characteristics of a subject with pharyngeal dystonia. This rare form of dystonia, considered to be a neurological condition resulting in involuntary spasm of the muscles of the pharynx, has not been documented in terms of its effects on the acoustic properties of the voice. This study revealed that during pharyngeal spasm, there are significant delays in voice onset time, a reduction in fundamental frequency, an increased percentage of sub-harmonics and variability in the amplitude perturbation quotient as well as shimmer. There was also evidence of these characteristics during periods of 'spasm-free' voice production, suggesting that the condition might be more consistent than what the subject described. Resonance disturbances were observed in spasm, which might explain the 'hollow' and affected voice quality. The subject also reported severe swallowing difficulties during the periods of spasm, characterised by a tight constriction at the level of the subject's throat. It is clear that an abnormality at the level of the cricopharyngeal muscle has a dual effect on the acoustic properties of the voice and on swallowing. |
| first_indexed | 2024-04-13T04:44:11Z |
| format | Article |
| id | doaj.art-51afa6ef0c9242429a35fa5f04e736d3 |
| institution | Directory Open Access Journal |
| issn | 0379-8046 2225-4765 |
| language | English |
| last_indexed | 2024-04-13T04:44:11Z |
| publishDate | 2001-12-01 |
| publisher | AOSIS |
| record_format | Article |
| series | South African Journal of Communication Disorders |
| spelling | doaj.art-51afa6ef0c9242429a35fa5f04e736d32022-12-22T03:01:53ZengAOSISSouth African Journal of Communication Disorders0379-80462225-47652001-12-01481213110.4102/sajcd.v48i1.734563The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case ReportLoren Kahn0Heila Jordaan1Department of Speech Pathology and Audiology, University of the Witwatersrand, JohannesburgDepartment of Speech Pathology and Audiology, University of the Witwatersrand, JohannesburgThis paper describes the swallowing difficulty and abnormal voicing characteristics of a subject with pharyngeal dystonia. This rare form of dystonia, considered to be a neurological condition resulting in involuntary spasm of the muscles of the pharynx, has not been documented in terms of its effects on the acoustic properties of the voice. This study revealed that during pharyngeal spasm, there are significant delays in voice onset time, a reduction in fundamental frequency, an increased percentage of sub-harmonics and variability in the amplitude perturbation quotient as well as shimmer. There was also evidence of these characteristics during periods of 'spasm-free' voice production, suggesting that the condition might be more consistent than what the subject described. Resonance disturbances were observed in spasm, which might explain the 'hollow' and affected voice quality. The subject also reported severe swallowing difficulties during the periods of spasm, characterised by a tight constriction at the level of the subject's throat. It is clear that an abnormality at the level of the cricopharyngeal muscle has a dual effect on the acoustic properties of the voice and on swallowing.https://sajcd.org.za/index.php/sajcd/article/view/734pharyngeal dystoniadysphagiaresonanceacoustic propertiesvoice onset time |
| spellingShingle | Loren Kahn Heila Jordaan The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report South African Journal of Communication Disorders pharyngeal dystonia dysphagia resonance acoustic properties voice onset time |
| title | The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report |
| title_full | The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report |
| title_fullStr | The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report |
| title_full_unstemmed | The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report |
| title_short | The Swallowing and Voicing Characteristics of Pharyngeal Dystonia: A Single Case Report |
| title_sort | swallowing and voicing characteristics of pharyngeal dystonia a single case report |
| topic | pharyngeal dystonia dysphagia resonance acoustic properties voice onset time |
| url | https://sajcd.org.za/index.php/sajcd/article/view/734 |
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