Executive dysfunction and apathy predict functional impairment in Alzheimer disease

Area of Science:

• Neurology
• Gerontology
• Psychology

Background:

• Alzheimer disease (AD) is a progressive neurodegenerative disorder.
• Functional impairment significantly affects the quality of life for individuals with AD.
• Understanding the relationship between cognitive/behavioral symptoms and functional decline is crucial for patient care.

Purpose of the Study:

• To investigate the association between executive cognitive dysfunction and frontally-mediated behavioral disturbances with functional impairment in mild-to-moderate Alzheimer disease (AD).

Main Methods:

• Forty-five patients with AD were assessed using the Mattis Dementia Rating Scale.
• Caregivers completed the Frontal Systems Behavioral Inventory and a modified Activities of Daily Living (ADLs) Questionnaire.
• Multiple regression analyses were employed to determine the variance explained by cognitive and behavioral factors.

Main Results:

• Executive cognitive dysfunction and apathy explained 44% of the variance in instrumental ADLs.
• Executive dysfunction alone accounted for 17% of instrumental ADL variance, with apathy contributing an additional 27%.
• Executive dysfunction and frontal-behavioral impairment explained 28% of basic ADL (BADL) variance, with apathy uniquely contributing after controlling for executive dysfunction.

Conclusions:

• Specific cognitive deficits, particularly executive dysfunction, and behavioral symptoms like apathy are significantly associated with functional impairment in Alzheimer disease.
• These findings highlight the importance of addressing both cognitive and behavioral aspects in managing functional decline in AD patients.