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Calcium stone disease: a multiform reality.

Alberto Trinchieri1, Chiara Castelnuovo, Renata Lizzano

  • 1Urology Unit, Lecco Hospital, Lecco, Italy. a.trinchieri@ospedale.lecco.it

Urological Research
|February 17, 2005
PubMed
Summary
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Calcium oxalate monohydrate (COM) and calcium oxalate dihydrate (COD) stones have different clinical and urinary patterns. COM stone formers are older with lower urinary calcium and calcium oxalate saturation than COD stone formers.

Area of Science:

  • Nephrology
  • Urology
  • Biochemistry

Background:

  • Calcium renal stones are common, with calcium oxalate monohydrate (COM) and calcium oxalate dihydrate (COD) being the most frequent types.
  • Understanding the composition of calcium stones is crucial for identifying their etiology and guiding treatment.

Purpose of the Study:

  • To compare clinical and urinary patterns of patients with calcium stones of different compositions using infrared spectroscopy.
  • To gain insight into the etiology of calcium stone formation based on stone composition.

Main Methods:

  • Infrared spectroscopy was used to analyze the composition of 84 consecutive calcium renal stones.
  • Serum biochemistry and 24-h urine analysis (calcium, phosphate, oxalate, citrate, electrolytes) were performed for each patient.

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Main Results:

  • Patients with COM stones were older and had lower mean daily urinary calcium and calcium oxalate saturation compared to those with COD stones.
  • Stones with urate components showed higher uric acid saturation, while stones with calcium phosphate components (>15%) exhibited higher calcium phosphate saturation.
  • Mixed urate stones were associated with lower urinary pH and calcium, whereas high calcium phosphate stones correlated with higher urinary pH and calcium.

Conclusions:

  • Accurate stone analysis, including minor components, is essential for personalized prophylactic treatment of calcium stone formers.
  • Treatment approaches for calcium stones should be tailored based on crystal form, hydration, and the presence of minor crystalline components.