Duration and Pathologic Correlates of Lewy Body Disease

Area of Science:

• Neurology
• Neuroscience
• Pathology

Background:

• Dementia with Lewy bodies (DLB) typically has a shorter disease duration than Alzheimer's disease dementia.
• Factors influencing disease duration in DLB are not well understood.
• Lewy body disease (LBD) encompasses both transitional and diffuse (neocortical) forms.

Purpose of the Study:

• To identify pathological correlates of disease duration in individuals with Lewy body disease (LBD).
• To investigate the association between LBD pathology and survival time.

Main Methods:

• Observational study using the National Alzheimer's Coordinating Center database (2005-2015).
• Included 807 participants with transitional or diffuse LBD.
• Assessed Braak neurofibrillary tangle (NFT) stage, neuritic plaque frequency, and LBD stage in relation to disease duration.

Main Results:

• Shorter disease duration was observed in men and individuals with a later age at onset.
• Diffuse (neocortical) LBD was associated with significantly shorter disease duration compared to transitional LBD.
• Braak NFT stage and neuritic plaque presence did not significantly correlate with disease duration.

Conclusions:

• Diffuse LBD is a significant predictor of shorter disease duration, independent of Braak NFT stage or neuritic plaque burden.
• These findings highlight the importance of LBD staging for prognosis.
• Identifying antemortem biomarkers for LBD stage could offer crucial prognostic information for DLB patients.