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The concentration of Zn, Mg and Mn in calcium oxalate monohydrate stones appears to interfere with their fragility in ESWL therapy

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Abstract

Extracorporeal shockwave lithotripsy (SWL) has remained the preferred method of treatment of urinary stones since its introduction in 1980. Although SWL is classified as a potential first-line treatment for renal stones smaller than 2 cm and its overall success rate is higher than 85% for stone clearance, not all renal calculi are successfully fragmented after SWL. Among the urinary stones, calcium oxalate monohydrate (COM) stone is one of the hardest stones to fragment. Several factors interfering with stone fragility are known to exist. In addition to technical properties for SWL to increase the quality and rate of stone disintegration, the composition of stones such as trace element levels may also interfere with the efficacy of SWL. Therefore, in the present study, we aimed to elucidate the correlation, if it exists, between fragmentation of renal stones and their trace element (Cu, Zn, Mg, Fe, Pb, Mn, Cr) concentrations. For this purpose, the patients admitted to our department who were identified with urinary stones (740 patients) and underwent SWL sessions were evaluated prospectively. Patients having 5–20 mm of solitary COM stone in the renal pelvis were included in this study. The trace element concentrations of renal stones that were successfully fragmented with SWL (SWL-S) were compared with those that were unsuccessfully fragmented after three SWL sessions (SWL-US) and removed surgically. Our measurements showed that the concentrations of Cu, Fe, Pb, and Cr were similar in both groups; by contrast, the concentration of Zn, Mg and Mn was significantly lower in SWL-US renal stones. The present results suggest that low concentrations of Zn, Mg and Mn in COM stones appear to make them resistant to SWL fragmentation and may offer a critical distinction for the choice of a treatment program.

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Authors and Affiliations

  1. Medical Faculty, Department of Urology, Eskisehir Osmangazi University, Eskisehir, Turkey

    Mehmet Turgut & Ibrahim Unal

  2. Faculty of Arts and Science, Department of Chemistry, Eskisehir Osmangazi University, Eskisehir, Turkey

    Asiye Berber & Temir Ali Demir

  3. Medical Faculty, Department of Biostatistics, Eskisehir Osmangazi University, Eskisehir, Turkey

    Fezan Mutlu

  4. Medical Faculty, Department of Anatomy, Eskisehir Osmangazi University, Eskisehir, Turkey

    Yüksel Aydar

Authors
  1. Mehmet Turgut
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  2. Ibrahim Unal
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  3. Asiye Berber
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  4. Temir Ali Demir
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  5. Fezan Mutlu
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  6. Yüksel Aydar
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Correspondence to Mehmet Turgut.

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Turgut, M., Unal, I., Berber, A. et al. The concentration of Zn, Mg and Mn in calcium oxalate monohydrate stones appears to interfere with their fragility in ESWL therapy. Urol Res 36, 31–38 (2008). https://doi.org/10.1007/s00240-007-0133-1

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  • DOI: https://doi.org/10.1007/s00240-007-0133-1

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