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Journal Article
Review
Rationale for a New Classification of Solutes of Interest in Chronic Kidney Disease and Hemodialysis.
Blood Purification 2023
A hallmark of chronic kidney disease is the retention of solutes that normally are eliminated by the kidneys. The current classification defines uremic toxins based on molecular weight and protein affinity. The retention of solutes is already detected in the early stages of the disease when patients are pauci-symptomatic or asymptomatic but the role of therapies to retard the loss of kidney function in patients with chronic kidney disease (e.g., modulators of the renin-angiotensin-aldosterone system, sodium-glucose cotransporter inhibitors) in reducing uremic toxins is poorly understood. Most of the research evaluating the impact of therapies to lower serum concentrations of those toxic compounds is carried out in patients with kidney failure already undergoing kidney replacement therapy. The removal of those molecules relies in physicochemical mass transfer phenomena, i.e., adsorption, diffusion, and convection. In the past 2 decades, the rise and broad adoption of blood purification strategies with enhanced convective properties, such as high-volume online hemodiafiltration and expanded hemodialysis, considerably amplified the ability to mechanically extract middle molecules (molecular weight >0.5 kDa) from the blood compartment. Nonetheless, the classification of uremic toxins has not evolved in parallel with dialysis advancements. Mounting evidence demonstrates the link between middle molecules with uremic symptoms, cardiovascular and mortality risks. An urgent need for updating the classification exists. Defining the causative relationship between specific solutes and specific clinical outcomes will promote the development of targeted therapies. In parallel, the inclusion of new pertinent dimensions to the classification like the influence of new dialysis membranes, sorbents, and intestinal chelators in the concentration of uremic toxins would improve the understanding of the pathogenesis of chronic kidney disease, setting the pace for future research in nephrology.
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