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  • Title: Critical Appraisal of Limitations in the Current Definition/Classification of Uremic Toxins.
    Author: Husain-Syed F, Vanholder R, Rosner MH, Kawanishi H, Sirich TL, Ronco C.
    Journal: Blood Purif; 2023; 52(3):221-232. PubMed ID: 36513030.
    Abstract:
    Progress in the identification and characterization of uremic retention solutes has refined our understanding of the pathophysiology of the uremic syndrome. Furthermore, the evolution of dialysis and other techniques designed to remove uremic retention solutes offers opportunities to provide a more personalized and targeted treatment for patients with chronic kidney disease (CKD) with an aim to improve outcomes. Considering these developments, a consensus report was recently published that readdressed the 2003 definition and classification of uremic toxins and formulated recommendations for future research to enhance the understanding of uremic retention solutes. In the present work, the authors of a work group that contributed to the consensus report provide a more detailed rationale for the recommendations related to their theme "Critical appraisal of limitations in the current definition/classification of uremic toxins." In summary, the authors propose that the current definition of uremic toxins should remain organized on hemodialysis strategies, membranes, and removal patterns since hemodialysis is the most frequently applied therapeutic strategy to reduce their concentration in advanced CKD. Nevertheless, the work group also acknowledges that any classification based on cutoff values and/or molecular spatial configurations is arbitrary and will likely need to be changed with therapeutic advancements. Furthermore, the current physicochemical classification might be extended to reflect the degree of toxicity of a specific toxin that is likely to support more personalized and targeted dialysis prescriptions and improve the outcomes for patients with CKD.
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