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Observational Study
. 2017 Oct;35(10):1497-1506.
doi: 10.1007/s00345-017-2028-2. Epub 2017 Mar 20.

Characteristics and outcomes of ureteroscopic treatment in 2650 patients with impacted ureteral stones

Jaap D Legemate  1 , Nienke J Wijnstok  2 , Tadashi Matsuda  3 , Willem Strijbos  4 , Tibet Erdogru  5 , Beat Roth  6 , Hidefumi Kinoshita  3 , Judith Palacios-Ramos  7 , Roberto M Scarpa  8 , Jean J de la Rosette  2
Affiliations
Observational Study

Characteristics and outcomes of ureteroscopic treatment in 2650 patients with impacted ureteral stones

Jaap D Legemate et al. World J Urol. 2017 Oct.

Abstract

Purpose: To describe stone-free rates and complications of ureteroscopic treatment for impacted compared with non-impacted ureteral stones and evaluate predictive variables for impaction.

Methods: The Clinical Research Office of the Endourological Society prospectively collected 1 consecutive year of data from 114 centers worldwide. Patients eligible for inclusion were patients treated with ureteroscopy for ureteral stones. Patient characteristics, treatment details, and outcomes were compared with regard to stone impaction. Logistic regression analyses were conducted to explore predictive variables for ureteral stone impaction and to analyse the effect of impaction on outcomes.

Results: Of the 8543 treated patients, 2650 (31%) had impacted and 5893 (69%) non-impacted stones. The stone-free rate was 87.1% for impacted stones, which is lower compared with 92.7% for non-impacted stones (p < 0.001). Intra-operative complication rates were higher for impacted stones (7.9 versus 3.0%, p < 0.001). Significantly higher ureteral perforation- and avulsion rates were reported in the impacted stone group compared with the non-impacted stone group. No association between stone impaction and post-operative complications could be shown. Female gender, ASA-score >1, prior stone treatment, positive pre-operative urine culture, and larger stones showed to be predictive variables for stone impaction.

Conclusions: Ureteroscopic treatment for impacted stones is associated with lower stone-free rates and higher intra-operative complication rates compared with treatment for non-impacted stones. The predictive variables for the presence of stone impaction may contribute to the identification of stone impaction during the diagnostic process. Moreover, identification of stone impaction may aid the selection of the optimal treatment modality.

Keywords: Complications; Impacted stones; Treatment outcomes; Ureter; Ureteroscopy; Urolithiasis.

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Conflict of interest statement

Conflict of interest

No competing financial interests exist.

Ethical standard

All human studies have been approved by the appropriate ethics committee and have, therefore, been performed in accordance with the ethical standards laid down in the 1964 Declaration of Helsinki and its later amendments.

References

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