Serum uric acid and endothelial dysfunction in continuous ambulatory peritoneal dialysis patients.
Endothelial dysfunction is an early predictor of cardiovascular events. Hyperuricemia has been shown to be associated with increased cardiovascular mortality. It remains unclear if serum uric acid (UA) is associated with endothelial dysfunction in peritoneal dialysis patients.


METHODS
In this cross-sectional study, the relationship of UA and endothelial dysfunction was investigated in 189 stable peritoneal dialysis patients. The clinical and laboratory data were collected. Endothelial function was estimated by flow-mediated dilatation (FMD) of the brachial artery and expressed as percentage change relative to baseline diameter.


RESULTS
UA levels did not differ between 93 male and 96 female patients (416.31 +/- 86.93 vs. 395.52 +/- 87.47 mumol/l, p > 0.05). Patients were grouped into three tertiles on the basis of their serum UA levels. Systolic blood pressure (p = 0.007), serum phosphate (p = 0.005), high-sensitive C-reactive protein (hs-CRP) (p < 0.001), and FMD (p = 0.016) were all different among UA tertiles. FMD was found to be related with UA (p = 0.002) and hs-CRP (p = 0.006) in a Pearson's correlation analysis. Multivariate regression analysis showed that only UA was an independent determinant of FMD (beta = -0.237, p = 0.036).


CONCLUSIONS
There was an independent correlation between UA and FMD, and a higher UA level was related to worse endothelial function which may contribute to hypertension and cardiovascular morbidity.
Tang
Ziyong
Z
Division of Nephrology, Peking University Third Hospital, 49 North Garden Road, Haidian District, Beijing, China.
Cheng
Li-Tao
LT
Li
Hong-Yan
HY
Wang
Tao
T
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D003430:Cross-Sectional Studies; D004730:Endothelium, Vascular / Q000503:physiopathology*; D005260:Female; D006801:Humans; D007676:Kidney Failure, Chronic / Q000097:blood* / Q000503:physiopathology / Q000628:therapy; D008297:Male; D008875:Middle Aged; D010531:Peritoneal Dialysis, Continuous Ambulatory; D014527:Uric Acid / Q000097:blood*; D055815:Young Adult
D014527:Uric Acid