Mixed brain pathologies account for most dementia cases¶

One-paragraph summary¶

In the first 141 autopsies of the Rush Memory and Aging Project, mixed lesions were more common than a single pure substrate among 50 people with dementia: 38.0% (n=19) had Alzheimer pathology plus infarcts, compared with 30.0% (n=15) Alzheimer pathology alone and 12% (n=6) vascular dementia alone. After age adjustment, multiple diagnoses raised dementia odds almost three-fold versus one pathologic diagnosis (OR 2.8, 95% CI 1.2–6.7) (Schneider 2007, PMID 17568013).

Key findings¶

Mixed Alzheimer and infarct pathology was the largest reported dementia category.
Clinical single-label classification understates copathology.
Autopsy provides a reference unavailable to most clinical cohorts.

Limitations¶

Category proportions are cohort-specific.
Neuropathological thresholds affect assignment.
End-of-life pathology does not reveal every temporal interaction.

Why it matters¶

It supplies the empirical basis for treating the Alzheimer–vascular border as central rather than exceptional.

Cited by wiki pages¶

Mixed pathology
Overview