Proposal for a New Classification of Solutes of Interest in Uremia and Hemodialysis

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Abstract

Uremic toxins contribute to clinical manifestations of kidney dysfunction. These toxins include organic and inorganic elements or compounds. While the kidney typically clears uremic toxins, gut dysbiosis, and tissue inflammation could lead to increased production of substances that can further the clinical manifestations of uremia. The uremic toxins are quantitatively measurable in biological fluids and have an established relationship with azotemia signs and symptoms. Their elimination is associated with mitigated uremic manifestations, while their administration to the uremic levels leads to uremic signs in animal or human models or in vitro studies. Besides, the uremic toxins have an established and plausible pathophysiologic relationship with uremic manifestations. The previous classification of uremic toxins was mainly focused on the physicochemical characteristics of these substances to divide them into three categories, (1) free water-soluble low-molecular-weight (500 Da and 12,000 Da). Unfortunately, the classification named above was not centered around patient outcomes and quality of life among those with severe kidney failure. Therefore, a panel of experts convened virtually to provide additional insights into the current state and propose a new uremic toxin classification. This article describes the group's consensus recommendations regarding the new classification of uremic toxins into more clinically oriented categories.

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