Retrospective review of 89 patients with pre-senile dementia followed by necropsy indicated significant differences between sub types of dementia. Patients with multi-infarct dementia (MID, 27 subjects) more often had cardiovascular abnormalities than patients with Alzheimer's disease (46 subjects). No patients with MID alone had a systolic blood pressure below 140 mm Hg, whereas 23 of 46 Alzheimer subjects and three of 16 patients with mixed features had such a systolic pressure.
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Clair et al. (1983) studied this question.