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1.  Relationship between Uric Acid and Subtle Cognitive Dysfunction in Chronic Kidney Disease 
American Journal of Nephrology  2011;34(1):49-54.
Background
Elevated serum uric acid has been associated with cognitive dysfunction and vascular cognitive impairment in the elderly. Serum uric acid is also commonly elevated in chronic kidney disease (CKD), but its relationship with cognitive function in these patients has not been addressed.
Methods
Subjects with CKD (defined as eGFR <60/ml/min/1.73 m2) were evaluated for cognitive dysfunction using the validated Standardized Mini-Mental State Examination (SMMSE). Individuals with dementia, depression or other psychiatric disorders were excluded, as were subjects on uric acid-lowering therapy or with serious illnesses such as severe anemia or active or ongoing cardiovascular or cerebrovascular disease.
Results
247 subjects were enrolled. SMMSE scores showed stepwise deterioration with increasing quartile of serum uric acid (26.4; 26.1; 25.5; 25.3, score range 20–30, p = 0.019). Post-hoc analysis demonstrated that there was no linear trend and only groups 1 and 4 were different with respect to SMMSE scores (p = 0.025). Stepwise multivariate linear regression revealed that age, educational status, presence of cerebrovascular disease, and serum uric acid were independently related to SMMSE scores.
Conclusion
Serum uric acid levels are independently and inversely associated with mild cognitive dysfunction in subjects with CKD.
doi:10.1159/000329097
PMCID: PMC3121541  PMID: 21659739
Cognitive function; Chronic kidney disease; Uric acid

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