Original Research Article
Insular Hypoperfusion Correlates with the Severity of Delusions in Individuals with Alzheimer’s DiseaseMatsuoka T.a · Narumoto J.a · Shibata K.a · Okamura A.a · Nakamura K.a · Okuyama C.b · Nishimura T.b · Fukui K.a
Departments of aPsychiatry and bRadiology, Graduate School of Medical Science, Kyoto Prefectural University of Medicine, Kyoto, Japan
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Background: The aim of this study was to identify the brain regions associated with the severity of delusions in individuals with Alzheimer’s disease (AD) using single-photon emission computed tomography. Methods: Thirty-five AD patients participated in this study. Multiple regression analysis was performed to identify a linear correlation between the delusion subscale score of the Neuropsychiatric Inventory (NPI) and regional cerebral blood flow (rCBF) in AD patients with delusions (n = 14). In addition, rCBF in patients with (n = 14) and without delusions (n = 21) was compared using a 2-sample t test. Results: The delusion subscale score of the NPI was negatively correlated with rCBF in the right anterior insula (uncorrected p < 0.01 at the voxel level and corrected p < 0.05 at the cluster level). Compared to patients without delusions, however, rCBF in the right anterior insula was not significantly decreased in patients with delusions. Conclusion: We suggest that right anterior insular dysfunction may exacerbate delusions, although it is not responsible for the onset of delusions.
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