Free p-cresylsulphate is a predictor of mortality in patients at different stages of chronic kidney disease

Nephrology, Dialysis, Transplantation : Official Publication of the European Dialysis and Transplant Association - European Renal Association
Sophie LiabeufEuropean Uraemic Toxin Work Group (EUTox)

Abstract

Uraemic toxins are considered to be emerging mortality risk factors in chronic kidney disease (CKD) patients. p-Cresol (a prototype protein-bound uraemic retention solute) has been shown to exert toxic effects in vitro. Recently, it has been demonstrated that p-cresol is present in plasma as its sulphate conjugate, p-cresylsulphate. The present study evaluated the distribution of free and total p-cresylsulphate and sought to determine whether these parameters were associated with vascular calcification, arterial stiffness and mortality risk in a cohort of CKD patients. One hundred and thirty-nine patients (mean +/- SD age: 67 +/- 12; males: 60%) at different stages of CKD (8% at Stage 2, 26.5% at Stage 3, 26.5% at Stage 4, 7% at Stage 5 and 32% at Stage 5D) were enrolled in this study. Baseline total and free p-cresylsulphate presented an inverse relationship with renal function and were significantly associated with vascular calcification. During the study period (mean follow-up period: 779 +/- 185 days), 38 patients died [including 22 from cardiovascular (CV) causes]. In crude survival analyses, free (but not total) p-cresylsulphate was shown to be a predictor of overall and CV death. Higher free p-cresylsulphate levels (>0.0...Continue Reading

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