Some studies suggest that concomitant cerebral infarction may worsen the severity of dementia in patients with Alzheimer disease (AD) and that neuropsychiatric symptoms are common either in patients with AD and vascular dementia. AD lesions together with cerebrovascular disease is commonly called mixed dementia (MD). METHODS: A retrospective analysis was carried out in medical charts of 70 patients with probable AD and 14 with MD. Information on neuropsychiatric symptoms was based on caregivers' and families' reports. RESULTS: Mean age was 74.5 years in AD and 75.1 in MD. The most common symptom in AD was agitation (61.4%), while in MD apathy was more common (71.7%). In MD, 9 (64.3%) patients had 5 or more symptoms, while in AD, 40 (57.1%) had 4 or less. Forty-five (64.3%) patients with AD had more than 4 years of disease; in MD, 10 (71.4%) had less than 3 years. Patients with MD showed shorter duration of symptoms (p<0.05), suggesting that these patients search earlier for medical treatment. CONCLUSIONS: Patients with MD exhibited a greater severity of neuropsychiatric symptoms, which may have been responsible for the earlier need of specialized assistance.
Alzheimer disease; mixed dementia; neuropsychiatric symptoms
