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Definition
 
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Dysarthria definition: Disorders of speech articulation caused by imperfect coordination of pharynx, larynx, tongue, or face muscles. This may result from CRANIAL NERVE DISEASES; NEUROMUSCULAR DISEASES; CEREBELLAR DISEASES; BASAL GANGLIA DISEASES; BRAIN STEM diseases; or diseases of the corticobulbar tracts (see PYRAMIDAL TRACTS). The cortical language centers are intact in this condition. (From Adams et al., Principles of Neurology, 6th ed, p489)
dysarthria definition: imperfect speech articulation due to disturbances of muscular control.
Dysarthria definition: Slow and slurred speech resulting from inability to coordinate the muscles that are used in speech. Causes include brain damage, Parkinson disease, and developmental causes.
Grade 1 Voice changes/dysarthria (e.g., hoarseness, loss or alteration in voice, laryngitis) definition: Mild or intermittent hoarseness or voice change, but fully understandable
Grade 2 Voice changes/dysarthria (e.g., hoarseness, loss or alteration in voice, laryngitis) definition: Moderate or persistent voice changes, may require occasional repetition but understandable on telephone
Grade 3 Voice changes/dysarthria (e.g., hoarseness, loss or alteration in voice, laryngitis) definition: Severe voice changes including predominantly whispered speech; may require frequent repetition or face-to-face contact for understandability; requires voice aid (e.g., electrolarynx) for <=50% of communication
Grade 4 Voice changes/dysarthria (e.g., hoarseness, loss or alteration in voice, laryngitis) definition: Disabling; non-understandable voice or aphonic; requires voice aid (e.g., electrolarynx) for >50% of communication or requires >50% written communication
Grade 5 Voice changes/dysarthria (e.g., hoarseness, loss or alteration in voice, laryngitis) definition: Death