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Age-related delay in urinary stone clearance in elderly patients with solitary proximal ureteral calculi treated by extracorporeal shock wave lithotripsy

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An Erratum to this article was published on 11 November 2015

Abstract

We investigated the effects of aging on the stone-free rate (SFR) after shock wave lithotripsy (SWL) for the treatment of proximal ureteral calculi. A total of 247 consecutive patients were retrospectively selected, classified into seven groups set at 10 year increments (from 20 to 90 years), and examined for SFR after SWL. According to our final analysis, 185 male and 62 female patients with an average age of 54.1 years had stones with a diameter of 11.5 mm and a density of 893.1 Hounsfield units. On average, SFR was 74.9 % at 3 months after 1.7 SWL sessions. SFR gradually reached ≥90 % for each age-group after 1.5–2 years. Median durations to achieve 50 % SFR were estimated to be 21 and 86 days for those in their 20 and 80 s, respectively. However, the difference between the two estimates was not significant (p = 0.064). The durations to achieve 50 % SFR for the other groups lay between these two estimates. Aging does not affect long-term SFR, but patients aged ≥80 years might experience delayed stone clearance within the first 12  months after SWL.

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Acknowledgments

The authors would like to acknowledge the special contributions made by Ms. Miwako Ono, a medical secretary in South Miyagi Medical Center, to data collection, and Mr. Takaaki Banno, a technician on radiology in South Miyagi Medical Center, to image management.

Conflict of interest

On behalf of the authors, I declare that no authors have any conflict of interest.

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Authors and Affiliations

  1. Department of Urology, Yamagata University Faculty of Medicine, Iida-Nishi 2-2-2, Yamagata City, Yamagata Prefecture, Japan

    Osamu Ichiyanagi, Akira Nagaoka & Tomoyuki Kato

  2. Department of Urology, South Miyagi Medical Center, Aza-nishi 38-1, Ogawara Town, Miyagi Prefecture, Japan

    Takuji Izumi & Yuko Kawamura

Authors
  1. Osamu Ichiyanagi
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  2. Akira Nagaoka
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  3. Takuji Izumi
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  4. Yuko Kawamura
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  5. Tomoyuki Kato
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Correspondence to Osamu Ichiyanagi.

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Ichiyanagi, O., Nagaoka, A., Izumi, T. et al. Age-related delay in urinary stone clearance in elderly patients with solitary proximal ureteral calculi treated by extracorporeal shock wave lithotripsy. Urolithiasis 43, 419–426 (2015). https://doi.org/10.1007/s00240-015-0783-3

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