Longitudinal change in everyday function and behavioral symptoms in frontotemporal dementia

Area of Science:

• Neuroscience
• Neurology
• Behavioral Science

Background:

• The link between behavioral changes and functional decline in frontotemporal dementia (FTD) remains unclear.
• Understanding these relationships is crucial for effective patient management.

Purpose of the Study:

• To investigate the longitudinal relationship between behavioral symptoms and functional decline in patients with behavioral variant FTD (bvFTD) and semantic variant primary progressive aphasia (svPPA).
• To compare the progression of behavioral and functional impairments between these two FTD subtypes.

Main Methods:

• Longitudinal follow-up (2-4 years) of 39 patients (21 bvFTD, 18 svPPA).
• Functional status assessed using the Disability Assessment for Dementia.
• Behavioral changes evaluated with the Cambridge Behavioural Inventory Revised.
• Statistical analyses included pairwise comparisons, mixed model analysis, and bivariate correlations.

Main Results:

• bvFTD patients exhibited greater functional impairment than svPPA patients at baseline and throughout follow-up.
• Behavioral profiles differed: bvFTD patients initially showed more apathy and eating changes; svPPA patients showed increases in all behaviors over time.
• Apathy contributed to functional disability in both bvFTD and svPPA, while stereotypical behaviors specifically worsened functional deficits in bvFTD.

Conclusions:

• bvFTD is associated with more significant functional impairment compared to svPPA, despite overlapping baseline behaviors.
• Apathy is a key driver of disability in both FTD subtypes.
• Stereotypical behaviors may play a role in maintaining activity engagement in svPPA, suggesting subtype-specific intervention strategies are needed for FTD.