Associations of Early Kidney Disease With Brain Magnetic Resonance Imaging and Cognitive Function in African Americans With Type 2 Diabetes Mellitus

作者：Freedman Barry I^*; Sink Kaycee M; Hugenschmidt Christina E; Hughes Timothy M; Williamson Jeff D; Whitlow Christopher T; Palmer Nicholette D; Miller Michael E; Lovato Laura C; Xu Jianzhao; Smith S Carrie; Launer Lenore J; Barzilay Joshua I; Cohen Robert M; Sullivan Mark D; Bryan R Nick; Wagner Benjamin C; Bowden Donald W; Maldjian Joseph A; Divers Jasmin

来源：American Journal of Kidney Diseases, 2017, 70(5): 627-637.

DOI：10.1053/j.ajkd.2017.05.006

• African American
• brain
• albuminuria
• chronic kidney disease (CKD)
• type 2 diabetes mellitus (T2DM)
• cognitive performance
• neurocognitive function
• estimated glomerular filtration rate (eGFR)
• urine albumin-creatinine ratio (UACR)
• magnetic resonance imaging (MRI)

Background: Relationships between early kidney disease, neurocognitive function, and brain anatomy are poorly defined in African Americans with type 2 diabetes mellitus (T2DM).
Study Design: Cross-sectional associations were assessed between cerebral anatomy and cognitive performance with estimated glomerular filtration rate (eGFR) and urine albumin-creatinine ratio (UACR) in African Americans with T2DM.
Setting & Participants: African Americans with cognitive testing and cerebral magnetic resonance imaging (MRI) in the African American-Diabetes Heart Study Memory in Diabetes (AA-DHS MIND; n = 512; 480 with MRI) and Action to Control Cardiovascular Risk in Diabetes (ACCORD) MIND (n = 484; 104 with MRI) studies.
Predictors: eGFR (CKD-EPI creatinine equation), spot UACR.
Measurements: MRI-based cerebral white matter volume (WMV), gray matter volume (GMV), and white matter lesion volume; cognitive performance (Mini-Mental State Examination, Digit Symbol Coding, Stroop Test, and Rey Auditory Verbal Learning Test). Multivariable models adjusted for age, sex, body mass index, scanner, intracranial volume, education, diabetes duration, hemoglobin A1c concentration, low-density lipoprotein cholesterol concentration, smoking, hypertension, and cardiovascular disease were used to test for associations between kidney phenotypes and the brain in each study; a meta-analysis was performed.
Results: Mean participant age was 60.1 +/- 6 7.9 (SD) years; diabetes duration, 12.1 +/- 6 7.7 years; hemoglobin A1c concentration, 8.3% +/- 1.7%; eGFR, 88.7 +/- 6 21.6 mL/min/1.73 m(2); and UACR, 119.2 +/- 6 336.4 mg/g. In the fully adjusted meta-analysis, higher GMV associated with lower UACR (P < 0.05), with a trend toward association with higher eGFR. Higher white matter lesion volume was associated with higher UACR (P < 0.05) and lower eGFR (P < 0.001). WMV was not associated with either kidney parameter. Higher UACR was associated with lower Digit Symbol Coding performance (P < 0.001) and a trend toward association with higher Stroop interference; eGFR was not associated with cognitive tests.
Limitations: Cross-sectional; single UACR measurement.
Conclusions: In African Americans with T2DM, mildly high UACR and mildly low eGFR were associated with smaller GMV and increased white matter lesion volume. UACR was associated with poorer processing speed and working memory.

• 出版日期2017-11
• 单位NIH