TY - JOUR
T1 - Diabetes, prediabetes, and brain volumes and subclinical cerebrovascular disease on MRI
T2 - The atherosclerosis risk in communities neurocognitive study (ARIC-NCS)
AU - Schneider, Andrea L.C.
AU - Selvin, Elizabeth
AU - Sharrett, A. Richey
AU - Griswold, Michael
AU - Coresh, Josef
AU - Jack, Clifford R.
AU - Knopman, David
AU - Mosley, Thomas
AU - Gottesman, Rebecca F.
N1 - Publisher Copyright:
© 2017 by the American Diabetes Association.
PY - 2017/11/1
Y1 - 2017/11/1
N2 - OBJECTIVE To examine the associations of prediabetes, diabetes, and diabetes severity (as assessed byHbA1c and diabetes duration)with brain volumes and vascular pathology on brainMRI and to assess whether the associations of diabetes with brain volumes are mediated by brain vascular pathology. RESEARCH DESIGN AND METHODS Cross-sectional study of 1,713 participants in the Atherosclerosis Risk in Communities Neurocognitive Study (ARIC-NCS) (mean age 75 years, 60% female, 27% black, 30% prediabetes, and 35% diabetes) who underwent 3T brain MRI scans in 2011-2013. Participants were categorized by diabetes-HbA1c status as without diabetes (<5.7% [reference]), with prediabetes (5.7 to <6.5%), and with diabetes ([defined as prior diagnosis or HbA1c ≥6.5%] <7.0% vs. ≥7.0%), with further stratification by diabetes duration (<10 vs. ≥10 years). RESULTS In adjusted analyses, comparedwith participantswithout diabetes and HbA1c <5.7%, participants with prediabetes and thosewith diabetes and HbA1c <7.0%did not have significantly different brain volumes or vascular pathology (all P > 0.05), but those with diabetes and HbA1c ≥7.0% had smaller total brain volume (b 20.20 SDs, 95% CI20.31,20.09), smaller regional brain volumes (including frontal, temporal, occipital, and parietal lobes; deep gray matter; Alzheimer disease signature region; and hippocampus [all P < 0.05]), and increased burden of white matter hyperintensities (WMH) (P = 0.016). Among participants with diabetes, those with HbA1c ≥7.0% had smaller total and regional brain volumes and an increased burden of WMH (all P < 0.05) compared with those with HbA1c <7.0%. Similarly, participants with longer duration of diabetes (≥10 years) had smaller brain volumes and higher burden of lacunes (all P < 0.05) than those with a diabetes duration <10 years. We found no evidence for mediation by WMH in associations of diabetes with smaller brain volumes by structural equation models (all P > 0.05). CONCLUSIONS More-severe diabetes (defined by higher HbA1c and longer disease duration) but not prediabetes or less-severe diabetes was associated with smaller brain volumes and an increased burden of brain vascular pathology. No evidence was found that associations of diabetes with smaller brain volumes are mediated by brain vascular pathology, suggesting that other mechanismsmay be responsible for these associations.
AB - OBJECTIVE To examine the associations of prediabetes, diabetes, and diabetes severity (as assessed byHbA1c and diabetes duration)with brain volumes and vascular pathology on brainMRI and to assess whether the associations of diabetes with brain volumes are mediated by brain vascular pathology. RESEARCH DESIGN AND METHODS Cross-sectional study of 1,713 participants in the Atherosclerosis Risk in Communities Neurocognitive Study (ARIC-NCS) (mean age 75 years, 60% female, 27% black, 30% prediabetes, and 35% diabetes) who underwent 3T brain MRI scans in 2011-2013. Participants were categorized by diabetes-HbA1c status as without diabetes (<5.7% [reference]), with prediabetes (5.7 to <6.5%), and with diabetes ([defined as prior diagnosis or HbA1c ≥6.5%] <7.0% vs. ≥7.0%), with further stratification by diabetes duration (<10 vs. ≥10 years). RESULTS In adjusted analyses, comparedwith participantswithout diabetes and HbA1c <5.7%, participants with prediabetes and thosewith diabetes and HbA1c <7.0%did not have significantly different brain volumes or vascular pathology (all P > 0.05), but those with diabetes and HbA1c ≥7.0% had smaller total brain volume (b 20.20 SDs, 95% CI20.31,20.09), smaller regional brain volumes (including frontal, temporal, occipital, and parietal lobes; deep gray matter; Alzheimer disease signature region; and hippocampus [all P < 0.05]), and increased burden of white matter hyperintensities (WMH) (P = 0.016). Among participants with diabetes, those with HbA1c ≥7.0% had smaller total and regional brain volumes and an increased burden of WMH (all P < 0.05) compared with those with HbA1c <7.0%. Similarly, participants with longer duration of diabetes (≥10 years) had smaller brain volumes and higher burden of lacunes (all P < 0.05) than those with a diabetes duration <10 years. We found no evidence for mediation by WMH in associations of diabetes with smaller brain volumes by structural equation models (all P > 0.05). CONCLUSIONS More-severe diabetes (defined by higher HbA1c and longer disease duration) but not prediabetes or less-severe diabetes was associated with smaller brain volumes and an increased burden of brain vascular pathology. No evidence was found that associations of diabetes with smaller brain volumes are mediated by brain vascular pathology, suggesting that other mechanismsmay be responsible for these associations.
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U2 - 10.2337/dc17-1185
DO - 10.2337/dc17-1185
M3 - Article
C2 - 28916531
AN - SCOPUS:85033223382
SN - 0149-5992
VL - 40
SP - 1514
EP - 1521
JO - Diabetes care
JF - Diabetes care
IS - 11
ER -