Cognitive and Behavioral Symptoms in ALSFTD: Detection, Differentiation, and Progression

Area of Science:

• Neurology
• Neuroscience
• Clinical Diagnostics

Background:

• Amyotrophic lateral sclerosis (ALS) can present with diverse cognitive and behavioral symptoms, complicating diagnosis.
• Distinguishing ALS with frontotemporal dementia (ALSFTD) from other ALS presentations is clinically significant.

Purpose of the Study:

• To evaluate the utility of the Mini-Addenbrooke's Cognitive Examination (M-ACE) and Motor Neuron Disease Behavioral Scale (MiND-B) in differentiating ALSFTD.
• To assess the ability of these tools to distinguish between ALSFTD, ALS plus (subtle cognitive/behavioral symptoms), and ALS pure (motor symptoms only).

Main Methods:

• A study involving 70 ALS patients categorized into ALSFTD, ALS plus, and ALS pure groups.
• Utilized the M-ACE and MiND-B screening tools for assessment.
• Applied Rasch modeling to analyze item performance on both scales.

Main Results:

• Over 90% of ALSFTD patients scored below the M-ACE cutoff, compared to approximately 20% of non-demented ALS patients.
• The MiND-B effectively differentiated between ALS pure and ALS plus diagnostic categories.
• Rasch modeling identified early cognitive (fluency, memory recall) and behavioral (apathy) symptoms associated with ALSFTD.

Conclusions:

• The combined use of M-ACE and MiND-B is effective in detecting ALSFTD.
• These tools aid in differentiating patients along the ALS disease continuum.
• The study provides insights into the progression of nonmotor symptoms in ALSFTD.