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SummaryBackground and objectives Increased arterial stiffness was reported to be associated with decreased estimated GFR (eGFR). Previous studies suggested that arterial stiffness might play a role in renal function progression in patients with chronic kidney disease (CKD). The aim of this study was to investigate whether there was an independent association between brachial-ankle pulse wave velocity (baPWV), a marker of arterial stiffness, and renal function progression in CKD patients.Design, setting, participants, & measurements This longitudinal study enrolled 145 patients with CKD stages 3 to 5. The baPWV was measured by using an ABI-form device. The change in renal function was estimated by eGFR slope. The study endpoints were defined as commencement of dialysis or death.Results After a stepwise multivariate analysis, the eGFR slope was positively associated with baseline eGFR and negatively associated with hypertension and baPWV (␤ ϭ Ϫ0.165, P ϭ 0.033). Seventeen patients entering dialysis, and eight deaths were recorded. Multivariate forward Cox regression analysis identified that higher baPWV (hazard ratio, 1.001; P ϭ 0.001), lower baseline eGFR, and higher serum phosphate level were independently associated with progression to commencement of dialysis or death. ConclusionsOur results show an independent association between baPWV and renal function decline and progression to commencement of dialysis or death in patients with CKD. Screening CKD patients by means of baPWV may help identify a high-risk group of rapid renal function decline and progression to commencing dialysis or death.

Background and objectives Fluid overload is a common characteristic associated with renal progression in CKD. Additionally, fluid overload is an independent predictor of all-cause or cardiovascular mortality in patients on dialysis, but its influence on patients not on dialysis is uncertain. The aim of the study was to assess the relationship between the severity of fluid status and clinical outcomes in an advanced CKD cohort.Design, setting, participants, & measurements In total, 478 predialysis patients with stages 4 and 5 CKD in the integrated CKD care program were enrolled from January of 2011 to December of 2011 and followed-up until August of 2013. The clinical outcomes included cardiovascular morbidity and all-cause mortality. The relative hydration status (overhydration/extracellular water) was used as the presentation of the severity of fluid status and measured using a body composition monitor. Overhydration/extracellular water .7% was defined as fluid overload.Results Over a median follow-up period of 23.2 (12.6-26.4) months, 66 (13.8%) patients reached all-cause mortality or cardiovascular morbidity. The adjusted hazard ratio of the combined outcome of all-cause mortality or cardiovascular morbidity for every 1% higher overhydration/extracellular water was 1.08 (95% confidence interval, 1.04 to 1.12; P,0.001). The adjusted overhydration/extracellular water for the combined outcome of all-cause mortality or cardiovascular morbidity in participants with overhydration/extracellular water $7% compared with those with overhydration/extracellular water ,7% was 1.93 (95% confidence interval, 1.01 to 3.69; P=0.04). In subgroup analysis, higher overhydration/extracellular water was consistently associated with increased risk for the combined outcome independent of diabetes, cardiovascular disease, and serum albumin. There was no significant interaction between all subgroups.Conclusions These findings suggest that fluid overload is an independent risk factor of the combined outcome of all-cause mortality or cardiovascular morbidity in patients with advanced CKD.

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