PURPOSE: Increased plasma glucose levels can relatively reduce F-FDG uptake in Alzheimer disease (AD)-related regions and alter the cerebral distribution pattern of F-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-FDG PET more than 5 times at various levels of plasma glucose. F-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-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-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.
PURPOSE: Increased plasma glucose levels can relatively reduce F-FDG uptake in Alzheimer disease (AD)-related regions and alter the cerebral distribution pattern of F-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-FDG PET more than 5 times at various levels of plasma glucose. F-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-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-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.
Authors: Ivayla Apostolova; Catharina Lange; Per Suppa; Lothar Spies; Susanne Klutmann; Gerhard Adam; Michel J Grothe; Ralph Buchert Journal: Eur J Nucl Med Mol Imaging Date: 2018-03-03 Impact factor: 9.236
Authors: T Harach; N Marungruang; N Duthilleul; V Cheatham; K D Mc Coy; G Frisoni; J J Neher; F Fåk; M Jucker; T Lasser; T Bolmont Journal: Sci Rep Date: 2017-02-08 Impact factor: 4.379