Construct Validity of the Amyotrophic Lateral Sclerosis Bulbar Dysfunction Index-Remote.

Area of Science:

• Neurology
• Clinical Assessment
• Biostatistics

Background:

• Bulbar dysfunction is a critical component of amyotrophic lateral sclerosis (ALS) progression.
• Remote assessment tools are increasingly important for patient monitoring in ALS.
• The Amyotrophic Lateral Sclerosis Bulbar Dysfunction Index-Remote (ALSBDI-R) was developed for remote clinician-administered assessment.

Purpose of the Study:

• To evaluate the construct validity of the ALSBDI-R.
• To examine the correlation of ALSBDI-R with established clinical measures.
• To assess the ALSBDI-R's ability to discriminate between different bulbar disease severities.

Main Methods:

• 92 ALS patients were recruited from two multidisciplinary clinics.
• Participants completed ALSBDI-R, ALSFRS-R, CNS-BFS, Sentence Intelligibility Test, and EAT-10.
• Construct validity was assessed using Spearman correlations and group comparisons.

Main Results:

• ALSBDI-R total scores showed strong correlations with ALSFRS-R bulbar subscore (r = -.85), CNS-BFS (r = .85), and EAT-10 (r = .77).
• The ALSBDI-R effectively discriminated between asymptomatic, mild, moderate, and severe bulbar dysfunction groups.
• These findings support the construct validity of the ALSBDI-R.

Conclusions:

• The ALSBDI-R is a valid instrument for the remote assessment of bulbar dysfunction in ALS patients.
• Its ability to differentiate severity levels makes it valuable for clinical practice and research.
• The tool offers a standardized method for remote monitoring of ALS progression.