The Prevalence and Severity of Neuropsychiatric Symptoms in Alzheimer's Disease and Subcortical Vascular Dementia : the CREDOS Study

ABSTRACT

OBJECTIVES: This study aimed to compare the prevalence and severity of clinically relevant neuropsychiatric symptoms between subjects with Alzheimer's disease (AD) and subcortical vascular dementia (SVD). METHODS: The CREDOS (Clinical Research for Dementia Of South Korea) is a multicenter longitudinal cohort study organized to evaluate the long-term outcome of dementia patients. Out of a total 3,080 subjects, we selected 1,392 AD subjects and 247 SVD subjects with mild to moderate levels of dementia. The Neuropsychiatric Inventory (NPI) and Clinical Dementia Rating Scale (CDR), and CDR sum of box scores were used for evaluation. RESULTS: After controlling for severity of dementia and duration of education, SVD subjects had relatively more symptoms of apathy compared to AD subjects (OR 1.397, p=0.025). SVD subjects also had relatively higher NPI composite scores in the apathy domain compared to AD subjects, after controlling for severity of dementia, age and duration of education (F=7.88, p=0.01). Subjects with moderate levels of dementia had more frequent and severe neuropsychiatric symptoms compared to those with mild dementia. CONCLUSION: Symptoms of apathy were more prevalent and severe in subjects with SVD, compared to subjects with AD.