Abstract
Dysarthria due to velopharyngeal incompetence arises from organic abnormalities such as cleft palate and trauma in a majority of cases, but from various functional defects without organic abnormalities in others. Spurious paralytic dysarthria in myasthenia gravis, which belongs to the latter category, presents interesting developments in the state of impediment. We studied fluid dynamics of phonation in a 16-year-old female patient with spurious paralytic dysarth-ria due to velopharyngeal incompetence derived from fatigue, and concluded that fluid dynamic evaluation of velopharyngeal function serves as a useful index in diagnosis and clinical observation of the patients with this diseases.
