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Distal renal tubular dysfunction: a common feature in calcium stone formers
European Journal of Clinical Investigation
|December 1, 1984
Summary
Distal renal tubular acidosis, a kidney tubule dysfunction, is a more common cause of calcium stones than previously thought. Impaired hydrogen ion secretion and ammonium excretion contribute to stone formation in patients with recurrent calcium stones.
Area of Science:
- Nephrology
- Urology
- Biochemistry
Background:
- Distal renal tubular acidosis (dRTA) is an uncommon cause of urinary calcium stone disease.
- This defect is more frequent when appropriate diagnostic tests are systematically performed.
- Recurrent calcium stones necessitate investigation into underlying tubular dysfunctions.
Purpose of the Study:
- To investigate distal tubular functions in patients with recurrent calcium stones.
- To determine the role of impaired hydrogen ion secretion and ammonium excretion in the pathogenesis of calcium stone disease.
Main Methods:
- Twenty-nine patients with recurrent calcium stones were categorized into normocalciuric, renal hypercalciuric, and absorptive hypercalciuric groups.
- Distal tubular function was assessed using the urine-blood pCO2 gradient.
- Ammonium chloride loading test was performed to evaluate ammonium excretion.
Main Results:
- Patients with calcium stones exhibited significantly lower urine-blood pCO2 gradients compared to controls.
- Following ammonium chloride loading, patients in two groups showed significantly reduced ammonium excretion compared to controls.
- These findings indicate impairments in hydrogen ion secretion and ammonium excretion.
Conclusions:
- Tubular dysfunctions, specifically impaired hydrogen ion secretion and ammonium excretion, are common in urinary calcium stone disease.
- These tubular defects play a contributory role in the pathogenesis of calcium stone formation.
- Systematic testing for distal tubular dysfunction is crucial in managing recurrent calcium stone disease.