Multidimensional Measurements of Dysarthria in Myotonic Dystrophy Type 1

Area of Science:

• Neurology
• Speech-Language Pathology
• Genetics

Background:

• Myotonic dystrophy type 1 (DM1) is a neuromuscular disorder causing progressive muscle weakness and myotonia.
• Dysarthria is a known symptom in DM1, but patient self-perception of its characteristics and severity is under-researched.

Purpose of the Study:

• To acoustically analyze speech in DM1 patients with dysarthria.
• To assess perceptual dysarthria severity and patient/relative subjective evaluations.
• To examine the relationship between acoustic, perceptual, and subjective outcomes.

Main Methods:

• Acoustic speech analysis using Praat software in 22 adult DM1 patients.
• Perceptual rating of dysarthria severity (0-5 scale).
• Patient and relative questionnaires and visual analogue scales (VAS) for speech evaluation.

Main Results:

• Acoustic analysis revealed deviations in speech rate, articulation rate, maximum phonation volume, and fundamental frequency range.
• Perceptual dysarthria severity ranged from minimal to severe.
• Patients reported satisfaction with their speech, independent of severity, while relatives' ratings decreased with increased severity.

Conclusions:

• Speech quality and intelligibility decline with increasing dysarthria severity, especially when assessed by clinicians and relatives.
• DM1 patients often exhibit reduced self-awareness of their speech deficits compared to external raters.
• Multidimensional assessment and increased patient awareness are crucial for speech therapy in DM1.