Journal
CLINICAL NUCLEAR MEDICINE
Volume 41, Issue 6, Pages E274-E280Publisher
LIPPINCOTT WILLIAMS & WILKINS
DOI: 10.1097/RLU.0000000000001147
Keywords
F-18-FDG; PET; glucose; Alzheimer disease; diabetes
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Purpose Increased plasma glucose levels can relatively reduce F-18-FDG uptake in Alzheimer disease (AD)-related regions and alter the cerebral distribution pattern of F-18-FDG, resulting in the appearance of an AD-like pattern. However, the relationship between the reversibility of the AD-like pattern and plasma glucose levels is uncertain. Methods Four cognitively normal elderly subjects with diabetes underwent longitudinal F-18-FDG PET more than 5 times at various levels of plasma glucose. F-18-FDG data were proportionally scaled with a global normalization method and used in volume of interest-based and voxelwise analyses. Volumes of interest were placed on representative AD-related regions: precuneus/posterior cingulate (PP), lateral parietal cortex, and frontal cortex. Results Volume of interest-based analyses showed negative correlations of plasma glucose levels with F-18-FDG uptake in the PP (r = -0.79, P < 0.001), lateral parietal cortex (r = -0.62, P = 0.002), and frontal cortex (r = -0.73, P < 0.001), controlling for the effects of interindividual differences and age. Voxelwise analyses also showed negative correlations between the 2 factors in the PP and medial frontal areas (P < 0.05, familywise error rate corrected). Conclusions This study indicates that the distribution pattern of F-18-FDG changes depending on plasma glucose levels in an individual and that the AD-like pattern can appear or disappear with increasing or decreasing plasma glucose levels, respectively.
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