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  • Title: Extracorporeal shock wave lithotripsy and percutaneous nephrostolithotomy for urinary calculi: comparison of immediate and long-term effects.
    Author: Carlson KJ, Dretler SP, Roth RA, Hatziandreu E, Gladstone K, Mulley AG.
    Journal: J Stone Dis; 1993 Jan; 5(1):8-18. PubMed ID: 10148257.
    Abstract:
    Extracorporeal shock wave lithotripsy and percutaneous nephrostolithotomy have become widely used technologies for removal of urinary calculi, despite a lack of adequate evaluative studies. The possibility of long-term adverse effects of these treatments has been raised, particularly an increase in stone recurrence and development of hypertension following extracorporeal shock wave lithotripsy. We conducted a retrospective study of 1,000 patients treated with extracorporeal shock wave lithotripsy or percutaneous nephrostolithotomy for upper tract stone disease to assess immediate effectiveness and complications, with prospective follow-up to assess stone recurrence and development of hypertension. The effectiveness of each treatment (defined in terms of patients rendered stone-free or having only fragments at discharge) was similar for most stone types. While stone recurrence rates in the first 2 years after treatment were similar in the two groups, cumulative recurrence at 3 years was higher following extracorporeal shock wave lithotripsy compared to percutaneous nephrostolithotomy (39% vs. 23%, p = 0.04). However, logistic regression and Kaplan-Meier analyses showed no significant difference in clinically evident recurrence for patients treated with extracorporeal shock wave lithotripsy. Cumulative incidence of clinically evident stone recurrence did not differ significantly between patients with fragments at discharge (20%) and patients rendered stone-free (15%) (p = 0.24). There was no difference in the development of new hypertension requiring medical treatment. Our findings indicate that extracorporeal shock wave lithotripsy is effective and associated with lower short-term morbidity than percutaneous nephrostolithotomy. Stone fragments left behind by lithotripsy do not appear to confer significant risk of early stone recurrence. Further study is necessary to define long-term risk of recurrence following extracorporeal shock wave lithotripsy.
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