Dysarthria in hereditary spastic paraplegia type 4

Area of Science:

• Neurology
• Speech-Language Pathology
• Genetics

Background:

• Hereditary Spastic Paraplegia type 4 (SPG4) is a genetic neurodegenerative disorder.
• Speech and swallowing difficulties are common in neurological conditions, but specific patterns in SPG4 are not well-defined.

Purpose of the Study:

• To characterize the speech patterns in patients diagnosed with SPG4.
• To investigate the correlation between speech characteristics and clinical data, including disease severity and age of onset.

Main Methods:

• A cross-sectional study involving 28 SPG4 patients and 17 age- and sex-matched controls.
• Speech assessment included auditory-perceptual and acoustic analyses.
• Disease severity was measured using the Spastic Paraplegia Rating Scale (SPRS).

Main Results:

• 53.5% of SPG4 patients presented with mild to moderate dysarthria, impacting phonation and articulation.
• Acoustic analysis revealed poorer performance in maximum phonation time, speech rate, and articulation rate in SPG4 patients.
• Articulation variables were found to correlate with the age of symptom onset.

Conclusions:

• Dysarthria is a common, mild, and non-progressive feature in SPG4, independent of motor disease progression.
• Speech and swallowing screening and therapy referral are advised for SPG4 patients.
• The pathophysiology of speech impairment in SPG4 may differ from typical corticospinal tract degeneration.