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1.
J Gerontol A Biol Sci Med Sci ; 73(3): 393-399, 2018 03 02.
Article in English | MEDLINE | ID: mdl-29244090

ABSTRACT

Background: Our primary goal is to describe the prevalence, severity, and risk of cognitive impairment (CI) by estimated glomerular filtration rate (eGFR, in mL/min/1.73 m2) in a cohort enriched for advanced chronic kidney disease (CKD; eGFR < 45), adjusting for albuminuria, as measured by urine albumin-to-creatinine ratio (UACR, in mg/g). As both eGFR and albuminuria are associated with CI risk in CKD, we also seek to determine the extent that eGFR remains a useful biomarker for risk of CI in those with CKD and concomitant albuminuria. Methods: Chi-square tests measured the prevalence of severe CI and mild cognitive impairment (MCI) by eGFR level. Logistic regression models and generalized linear models measured risk of CI by eGFR, adjusted for UACR. Results: Participants were 574 adults with a mean age of 69; 433 with CKD (eGFR < 60, nondialysis) and 141 controls (eGFR ≥ 60). Forty-eight percent of participants with CKD had severe CI or MCI. The prevalence of severe CI was highest (25%) in those with eGFR < 30. eGFR < 30 was only associated with severe CI in those without albuminuria (UACR < 30; OR = 3.3; p = .02) and was not associated with MCI in similar models. Conclusions: One quarter of those with eGFR < 30 had severe CI. eGFR < 30 was associated with over threefold increased odds of severe CI in those with UACR < 30, but not with UACR > 30, suggesting that eGFR < 30 is a valid biomarker for increased risk of severe CI in those without concomitant albuminuria.


Subject(s)
Cognitive Dysfunction/epidemiology , Cognitive Dysfunction/etiology , Renal Insufficiency, Chronic/complications , Renal Insufficiency, Chronic/epidemiology , Aged , Albuminuria/complications , Albuminuria/epidemiology , Female , Glomerular Filtration Rate , Humans , Kidney Function Tests , Male , Minnesota/epidemiology , Prevalence , Risk , Severity of Illness Index
2.
Am J Kidney Dis ; 70(3): 357-367, 2017 Sep.
Article in English | MEDLINE | ID: mdl-28606731

ABSTRACT

BACKGROUND: Chronic kidney disease is common and is associated with cardiovascular disease, cerebrovascular disease, and cognitive function, although the nature of this relationship remains uncertain. STUDY DESIGN: Cross-sectional cohort using baseline data from the Systolic Blood Pressure Intervention Trial (SPRINT). SETTING & PARTICIPANTS: Participants in SPRINT, a randomized clinical trial of blood pressure targets in older community-dwelling adults with cardiovascular disease, chronic kidney disease, or high cardiovascular disease risk and without diabetes or known stroke, who underwent detailed neurocognitive testing in the cognition substudy, SPRINT-Memory and Cognition in Decreased Hypertension (SPRINT-MIND). PREDICTORS: Urine albumin-creatinine ratio (ACR) and estimated glomerular filtration rate (eGFR). OUTCOMES: Cognitive function, a priori defined as 5 cognitive domains based on 11 cognitive tests using z scores, and abnormal white matter volume quantified by brain magnetic resonance imaging. RESULTS: Of 9,361 SPRINT participants, 2,800 participated in SPRINT-MIND and 2,707 had complete data; 637 had brain imaging. Mean age was 68 years, 37% were women, 30% were black, and 20% had known cardiovascular disease. Mean eGFR was 70.8±20.9mL/min/1.73m2 and median urine ACR was 9.7 (IQR, 5.7-22.5) mg/g. In adjusted analyses, higher ACR was associated with worse global cognitive function, executive function, memory, and attention, such that each doubling of urine ACR had the same association with cognitive performance as being 7, 10, 6, and 14 months older, respectively. Lower eGFR was independently associated with worse global cognitive function and memory. In adjusted models, higher ACR, but not eGFR, was associated with larger abnormal white matter volume. LIMITATIONS: Cross-sectional only, no patients with diabetes were included. CONCLUSIONS: In older adults, higher urine ACR and lower eGFR have independent associations with global cognitive performance with different affected domains. Albuminuria concurrently identifies a higher burden of abnormal brain white matter disease, suggesting that vascular disease may mediate these relationships.


Subject(s)
Cognition Disorders , Cognition/physiology , Renal Insufficiency, Chronic , Aged , Blood Pressure Determination/methods , Cardiovascular Diseases/epidemiology , Cognition Disorders/diagnosis , Cognition Disorders/physiopathology , Cross-Sectional Studies , Female , Glomerular Filtration Rate , Humans , Hypertension/diagnosis , Hypertension/psychology , Intelligence Tests , Kidney Function Tests/methods , Magnetic Resonance Imaging/methods , Male , Renal Insufficiency, Chronic/diagnosis , Renal Insufficiency, Chronic/psychology , Risk Factors , Statistics as Topic , White Matter/diagnostic imaging
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