An analysis of renal tubular acidosis by the Stewart method

Renal tubular acidosis (RTA) comprises a group of disorders characterized by a low capacity for net acid excretion and persistent hyperchloremic, metabolic acidosis. To investigate the role of chloride, we performed hypotonic (0.45%) saline-loading experiments in 12 children with alkali-treated dist...

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Veröffentlicht in:Pediatric nephrology (Berlin, West) West), 2006-02, Vol.21 (2), p.206-211
Hauptverfasser: Corey, Howard E, Vallo, Alfredo, Rodríguez-Soriano, Juan
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Vallo, Alfredo
Rodríguez-Soriano, Juan
description Renal tubular acidosis (RTA) comprises a group of disorders characterized by a low capacity for net acid excretion and persistent hyperchloremic, metabolic acidosis. To investigate the role of chloride, we performed hypotonic (0.45%) saline-loading experiments in 12 children with alkali-treated distal RTA (dRTA) and compared the results with data obtained from 17 healthy control subjects. In patients, but not in controls, saline loading induced both hyperchloremia and metabolic acidosis. Hyperchloremia was associated with high total and high distal fractional reabsorption of chloride [C(H20)/(C(H20)+C(Cl))]. The increase in plasma chloride varied inversely with the fractional excretion of chloride (C(Cl)) and correlated with the decrease in blood pH. However, the urinary excretion of bicarbonate did not correlate with either changes in blood pH or plasma bicarbonate concentration. Our findings suggest that the mechanism of hyperchloremia was enhanced Cl(-)/HCO(3) (-) exchange by the distal tubule. The resulting metabolic acidosis is better explained by changes in the strong ion difference (the Stewart theory) than by changes in the urine bicarbonate excretion (the traditional theory).
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subjects Acid-Base Imbalance - etiology
Acidosis
Acidosis, Renal Tubular - complications
Acidosis, Renal Tubular - metabolism
Carrier proteins
Child
Child, Preschool
Chloride
Chlorides - metabolism
Electrolytes
Female
Health aspects
Humans
Hydrogen
Hypotonic Solutions
Infant
Male
Metabolism
Mutation
Plasma
Proteins
Protons
Sodium Chloride
Urine
title An analysis of renal tubular acidosis by the Stewart method
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