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[So-called "renal" idiopathic hypercalciuria most often has a dietary origin]
P Jaeger1, L Portmann, J M Ginalski
1Département de médecine interne, Centre hospitalier universitaire vaudois, Lausanne.
Schweizerische Medizinische Wochenschrift
|January 9, 1988
Summary
Many renal stone formers diagnosed with idiopathic hypercalciuria may have other contributing factors like high sodium intake, obesity, or undiagnosed medullary sponge kidneys. Only a fraction truly exhibit primary renal calcium leak.
Area of Science:
- Nephrology
- Metabolic Disorders
- Urology
Context:
- Idiopathic hypercalciuria is often presumed to be a primary renal calcium leak in stone formers.
- Dietary factors (sodium, protein, carbohydrates) and obesity can also cause hypercalciuria.
- The incidence of true renal hypercalciuria may have been overestimated.
Purpose:
- To evaluate dietary and metabolic factors in idiopathic hypercalciuria patients refractory to low calcium intake.
- To identify alternative causes of hypercalciuria beyond a primary renal leak.
Summary:
- 51 stone formers with refractory idiopathic hypercalciuria were assessed for dietary and metabolic factors.
- High sodium intake, hyperuricosuria (suggesting high animal protein), obesity, and medullary sponge kidneys were identified in a significant number of patients.
- Only 14 out of 51 patients had unexplained idiopathic hypercalciuria on a low calcium diet.
Impact:
- Challenges the overestimation of primary renal hypercalciuria in stone formers.
- Highlights the importance of considering multifactorial causes of hypercalciuria.
- Suggests revised diagnostic approaches for idiopathic hypercalciuria in renal stone disease.