Interactions Between Acute Infarcts and Cerebrovascular Pathology Predict Poststroke Dementia

Area of Science:

• Neurology
• Neuroimaging
• Geriatric Medicine

Background:

• Chronic cerebrovascular pathology is a known risk factor for poststroke dementia (PSD).
• The specific interplay between different types of cerebrovascular pathology and acute stroke lesions in determining PSD risk remains unclear.

Purpose of the Study:

• To investigate the association between PSD and unique patterns of interaction between chronic cerebrovascular pathologies and acute stroke lesions.
• To identify specific cerebrovascular and stroke characteristics that elevate the risk of developing PSD.

Main Methods:

• A case-control study involving 185 acute mild stroke patients.
• Patients were categorized as cases (developed PSD at 6 months) or controls (remained non-demented at 6 months), matched for prestroke cognitive status.
• Magnetic resonance imaging (MRI) assessed cerebrovascular pathology and acute infarcts; neuropsychological tests evaluated cognitive status post-stroke.

Main Results:

• White matter hyperintensities, chronic lacunes, microbleeds, and acute infarcts alone were not significantly associated with PSD.
• The highest PSD risk was observed in patients with large subcortical infarcts (>15 mm) and concurrent periventricular white matter hyperintensities (OR=5.85).
• Moderate PSD risk was associated with multiple small infarcts (3-15 mm) combined with lacunes (OR=2.48) or lobar microbleeds (OR=2.20).

Conclusions:

• The risk of poststroke dementia is significantly influenced by the combination of chronic cerebrovascular pathologies and the type of acute infarct.
• These findings highlight the need for a precision medicine approach to identify and manage individuals at high risk for PSD.