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Yonsei Med J. 2017 Sep;58(5):1000-1005. doi: 10.3349/ymj.2017.58.5.1000.

Impact of Pretreatment Hydronephrosis on the Success Rate of Shock Wave Lithotripsy in Patients with Ureteral Stone.

Author information

1
Department of Urology and Urological Science Institute, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
2
Department of Radiology and Research Institute of Radiological Science, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3
Department of Urology and Urological Science Institute, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul, Korea. kscho99@yuhs.ac.

Abstract

PURPOSE:

To evaluate predictors of the success rate for one session of shock wave lithotripsy (SWL), focusing on the relationships between pretreatment hydronephrosis grade and one-session SWL success rates.

MATERIALS AND METHODS:

The medical records of 1824 consecutive patients who underwent an initial session of SWL for treatment of urinary stones between 2005 and 2013 were reviewed. After exclusion, 700 patients with a single, 4-20 mm diameter radiopaque calculus were included in the study.

RESULTS:

The mean maximal stone length (MSL) and skin-to-stone distance were 9.2±3.9 and 110.8±18.9 mm, respectively. The average values for mean stone density (MSD) and stone heterogeneity index (SHI) were 707.0±272.1 and 244.9±110.1, respectively. One-session success rates were 68.4, 75.0, 75.1, 54.0, and 10.5% in patients with hydronephrosis grade 0, 1, 2, 3, and 4, respectively. Patients were classified into success or failure groups based on SWL outcome. Multivariate logistic regression analyses revealed that MSL [odds ratio (OR) 0.888, 95% confidence intervals (CI): 0.841-0.934, p<0.001], MSD (OR 0.996, 95% CI: 0.995-0.997, p<0.001), SHI (OR 1.007, 95% CI: 1.005-1.010, p<0.001), and pretreatment hydronephrosis grade (OR 0.601, 95% CI: 0.368-0.988, p=0.043) were significantly associated with one-session success.

CONCLUSION:

Pretreatment grades 3 or 4 hydronephrosis were associated with failure of SWL in patients with a single ureteral stone. In the presence of severe hydronephrosis, especially hydronephrosis grade 4; physicians should proceed cautiously in choosing and offering SWL as the primary treatment for ureteral stone.

KEYWORDS:

Ureteral calculi; high-energy shock waves; hydronephrosis; lithotripsy

PMID:
28792145
PMCID:
PMC5552626
DOI:
10.3349/ymj.2017.58.5.1000
[Indexed for MEDLINE]
Free PMC Article

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