Albuminuria and Estimated GFR as Risk Factors for Dementia in Midlife and Older Age: Findings From the ARIC Study

Johannes B. Scheppach, Josef Coresh, Aozhou Wu, Rebecca F. Gottesman, Thomas H. Mosley, David S. Knopman, Morgan E. Grams, A. Richey Sharrett, Silvia Koton

Research output: Contribution to journalArticle

Abstract

Rationale & Objective: Evidence is limited on how estimated glomerular filtration rate (eGFR) and urinary albumin-creatinine ratio (UACR) relate to dementia at different ages. We evaluated eGFR and UACR in midlife and older age as risk factors for dementia. Additionally, we assessed whether the association between eGFR and dementia is altered when cystatin C and β2-microglobulin (B2M) levels are used for GFR estimation. Study Design: Prospective cohort study. Setting & Participants: Two baselines from the Atherosclerosis Risk in Communities (ARIC) Study were used: visit 4 (1996-1998), including 9,967 participants 54 to 74 years old, and visit 5 (2011-2013), including 4,626 participants 70 to 90 years old. Participants were followed up until 2017. Predictors: Log(UACR); eGFR based on creatinine, cystatin C, creatinine and cystatin C, or B2M levels (denoted as eGFRcr, eGFRcys, eGFRcr-cys, and eGFRB2M). Outcome: Incident dementia. Analytical Approach: Multivariable Cox proportional hazards regression models fit separately for each of the 5 predictors and based on a change in the predictor equivalent to the interquartile range for that predictor at visit 4 (IQRV4). eGFR models were adjusted for log(UACR) and log(UACR) models were adjusted for eGFRcys. Results: We observed 1,821 dementia cases after visit 4 and 438 cases after visit 5. Dementia risk increased with higher albuminuria levels (HRs per IQRV4 [equivalent to 4.2-fold greater log albuminuria] of 1.15 [95% CI, 1.09-1.21] after visit 4 and 1.27 [95% CI, 1.13-1.42] after visit 5). An association with lower eGFR was seen for only eGFRcys (HRs per IQRV4 [equivalent to 24.3 mL/min/1.73 m2 lesser eGFRcys] of 1.12 [95% CI, 1.04-1.21] after visit 4 and 1.30 [95% CI, 1.12-1.52] after visit 5) and eGFRB2M (HRs per IQRV4 [equivalent to 18.3 mL/min/1.73 m2 lesser eGFRB2M] of 1.15 [95% CI, 1.07-1.23] after visit 4 and 1.34 [95% CI, 1.17-1.55] after visit 5). Differences between these associations in midlife and older age were not statistically significant. Limitations: Changes in potentially time-varying covariates were not measured. Dementia was not subclassified by cause. Conclusions: Albuminuria was consistently associated with dementia incidence. Lower eGFR based on cystatin C or B2M, but not creatinine, levels was also associated with dementia. Risk associations were similar when kidney measures were assessed at midlife and older age.

Original languageEnglish (US)
JournalAmerican Journal of Kidney Diseases
DOIs
StateAccepted/In press - 2020

Keywords

  • Albuminuria
  • albuminuria
  • Atherosclerosis Risk in Communities (ARIC) Study
  • beta-2-microglobulin (B2M)
  • chronic kidney disease (CKD)
  • cognitive decline
  • creatinine
  • cystatin C
  • dementia
  • elderly
  • estimated glomerular filtration rate (eGFR)
  • geriatric
  • midlife
  • older age
  • renal function
  • urine albumin-creatinine ratio (UACR)

ASJC Scopus subject areas

  • Nephrology

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    Scheppach, J. B., Coresh, J., Wu, A., Gottesman, R. F., Mosley, T. H., Knopman, D. S., Grams, M. E., Sharrett, A. R., & Koton, S. (Accepted/In press). Albuminuria and Estimated GFR as Risk Factors for Dementia in Midlife and Older Age: Findings From the ARIC Study. American Journal of Kidney Diseases. https://doi.org/10.1053/j.ajkd.2020.03.015