ALS-specific cognitive and behavior changes associated with advancing disease stage in ALS.

Area of Science:

• Neurology
• Neuroscience
• Clinical Research

Background:

• Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease affecting motor neurons.
• Cognitive and behavioral changes are increasingly recognized in ALS patients.
• The King's Clinical Staging System and Edinburgh Cognitive and Behavioural ALS Screen (ECAS) are tools for assessing disease stage and neuropsychological function, respectively.

Purpose of the Study:

• To investigate the relationship between ALS disease stage, using the King's Clinical Staging System, and cognitive and behavioral alterations measured by the ECAS.
• To determine how specific ALS-related functions and general cognitive abilities are affected by disease progression.
• To explore the impact of bulbar signs on cognitive and behavioral deficits in ALS.

Main Methods:

• A multicenter observational study involving 161 ALS patients and 80 healthy controls.
• Participants were assessed using the ECAS, a tool for evaluating cognitive and behavioral changes.
• Patients were categorized into disease stages according to the King's Clinical Staging System.

Main Results:

• ALS patients showed significant differences compared to controls on most ECAS subtests, excluding visuospatial functioning.
• ALS-specific cognitive functions (executive, language, fluency) and overall ECAS scores significantly correlated with disease stage.
• Impairment in ALS-specific cognitive domains and behavioral changes increased with disease severity, with bulbar signs significantly influencing these scores.

Conclusions:

• Cognitive deficits and behavioral impairments are more prevalent and severe in later stages of ALS.
• Nearly all patients exhibit neuropsychological impairment by end-stage ALS.
• Cognitive and behavioral assessments should be integrated into ALS diagnostic criteria and staging systems to better reflect disease burden.