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[Impairment of acid-base balance in renal failure].

It is very critical for the living organism to maintain homeostasis of body fluid volume and its electrolyte composition by renal regulation, including acid-base balance. In renal failure, impaired acid-base balance is inescapable because of disturbed urinary acidification, one of the major renal functions. Among all types of acid-base imbalance, metabolic acidosis is a major one in renal failure. For better understanding of this issue, several fundamental items for the renal mechanisms of urinary acidification must be discussed first, and the pathophysiological features and their relevant treatment for acid-base imbalances in renal failure, next. Moreover, some comments on the practical aspects, in long-term dialyze uremic patients, is also provided.