The Kidney Wiki
The Kidney Wiki

Brenner and Rector's The Kidney, 8th ed.[]

  • Section II - Integrated Control of Body Fluid Volume and Composition
    • Chapter 14 - Disorders of Acid-Base Balance
      • Metabolic Disorders
        • Metabolic Acidosis
          • Hyperchloremic (Normal Anion Gap) Metabolic Acidoses
            • Disorders of Impaired Renal Bicarbonate Reclamation: Proximal Renal Tubular Acidosis
            • Disorders of Impaired Net Acid Excretion with Hypokalemia: Classic Distal Renal Tubule Acidosis
            • Disorders of Impaired Net Acid Excretion with Hyperkalemia: Generalized Distal Nephron Dysfunction (Type 4 Renal Tubular Acidosis)

Pathophysiology

  • 遠端高血鉀性是CCT有問題或缺aldosterone
  • 遠端低血鉀性則是下列異常(在type A intercalated cell in medullary collecting duct),共同特色為無法將尿液酸至pH<5.5:
    • Basolateral HCO3-/Cl- exchanger
    • Subunit of H+-ATPase的問題
    • Abnormal leak pathway (Amphotericin B)
    • H+,K+-ATPase
    • Defective intracellular carbonic anhydrase (type 2)
  • 正常人給大量HCO3-,會使distal H+ secretion造成尿液高的PCO2(U-B PCO2反映遠端酸化之能力)。
  • 除了leak(amphotericin B,此為"gradient" defect)外,distal classic RTA皆有low U-B PCO2 gradient。

Original Articles[]

  • Carboni I, Andreucci E, and Caruso MR et al. Medullary sponge kidney associated with primary distal renal tubular acidosis and mutations of the H+-ATPase genes. Nephrol Dial Transplant. 2009 Sep;24(9):2734-8. Epub 2009 Apr 13.