Neuropsychiatric symptoms are common features in patients with neurodegenerative diseases, and have important clinical implications for both patients and caregivers. This study used the Neuropsychiatric Inventory (NPI) to measure symptomatology in 120 patients drawn from five disease groups: Parkinson's disease (PD), Alzheimer's disease (AD), dementia associated with Lewy bodies (DLB), multiple system atrophy (MSA) and progressive supranuclear palsy (PSP). Ninety per cent of the patient group reported experiencing at least one symptom, with the most prevalent symptoms being depression and apathy. However, a differential pattern of symptomatology was reported across the disease groups, a finding which has diagnostic and treatment implications. Furthermore, this provides additional evidence that a broad cortical–subcortical distinction cannot be supported.
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