Cognitive and Behavioral Manifestations in ALS: Beyond Motor System Involvement

Area of Science:

• Neurology
• Neuroscience
• Clinical Medicine

Background:

• Amyotrophic lateral sclerosis (ALS) was traditionally viewed as a motor neuron disease.
• Increasing evidence shows cognitive and behavioral changes in ALS patients, leading to the concept of ALS-frontotemporal spectrum disorder (ALS-FTSD).

Purpose of the Study:

• To provide an overview of cognitive and behavioral manifestations in ALS patients.
• To improve clinical management of ALS-FTSD.
• To discuss subtypes, clinical features, diagnostics, and therapeutics for ALS-FTSD.

Main Methods:

• Review of clinical manifestations, neuroimaging, neuropathology, genetics, and therapeutic options for ALS-FTSD.
• Categorization of ALS-FTSD based on neuropsychological deficits (behavioral, social cognition, executive function, language, memory).

Main Results:

• Cognitive impairment affects up to 65% of ALS patients; dementia is present in about 15%.
• ALS-FTSD patients exhibit a worse prognosis and shorter survival rates compared to ALS or frontotemporal dementia alone.
• Behavioral and personality changes are significant negative prognostic factors.

Conclusions:

• Early detection and monitoring of cognitive deficits in ALS are vital for patient and caregiver support.
• Personalized management strategies are essential for individuals with ALS-FTSD.
• Disturbances in TDP-43 and tau protein metabolism are key pathological hallmarks of ALS-FTSD.