Levator Veli Palatini Muscle Activity in Patients with Velopharyngeal Incompetence Due to Stroke.
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Accession number;00A0256538
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| Title;Levator Veli Palatini Muscle Activity in Patients with Velopharyngeal Incompetence Due to Stroke. |
| Author;
TACHIMURA TAKASHI
(Osaka Univ., Hosp. Attach. to Fac. of Dent.)
FUJITA YOSHINORI
(Osaka Univ., Hosp. Attach. to Fac. of Dent.)
YONEDA MAYUMI
(Osaka Univ., Hosp. Attach. to Fac. of Dent.)
WADA TAKESHI
(Osaka Univ., Hosp. Attach. to Fac. of Dent.)
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Journal Title;Japan Journal of Logopedics and Phoniatrics
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Journal Code:Z0214B
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ISSN:0030-2813
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VOL.41;NO.1;PAGE.8-16(2000)
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| Figure&Table&Reference;FIG.5, TBL.1, REF.18 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;This study aimed to clarify whether levator veli palatini muscle activity ranges for speech blowing and the relationship between levator activity for speech and possible maximum levator activity are consistent across patients showing hypernasality caused by velopharyngeal incompetence accompanied by stroke. Three patients suffering from hypernasality after stroke were examined using electromyography of the levator veli palatini muscle during speech and blowing. Speech tasks were ten-time productions of the isolated nasal sounds /ma/,/me/ and /mu/; the vowels /a/,/e/ and /u/; the obstruent sounds /b/,/p/ and /s/ followed by the above vowels; plus the affricates /tsu/ and /t.INT.i/. Blowing tasks called for blowing at three different levels of soft, moderate, and hard intensity. Causes of stroke, time course from initiation to first visit, and care management were variable across the three patients. It was reported that each patient showed maximum activity level in a certain task for speech, but not in blowing at maximum intensity level. EMG activity was distributed in a bipolar manner: that is, for some samples levator activity ranged lower than 50% of the maximum activity level, but for other samples the range was observed in a relatively higher region approaching the maximum activity level. This finding was consistent across all patients irrespective of individual symptoms, causes of occurrence, and management of care. The finding was also similar to that of a previously reported case showing hypernasality after stroke. The results obtained here suggest that velopharyngeal incompetence accompanied by stroke is possibly consistent, so that the same strategy to induce velopharyngeal function could be designed and applied to prevent fatigue of the levator muscle. (author abst.) |
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