Abstract

To determine stone-free rate following shockwave lithotripsy (SWL) with/without alpha-blockers as well as complication rates (individual and classified using the Clavien-Dindo system). We performed a systematic review of all randomized controlled trials that included more than 20 patients (age > 18 years) and examined the use of alpha-blockers after SWL. Meta-analysis was performed using 'metafor' in R. We report risk ratios (RRs) with 95% confidence intervals (95% CIs). The PROSPERO ID for the trial was: CRD42021248108. We assessed 158 full-text articles and included a total of 21 studies in our review. There were 1445 patients receiving alpha-blockers and 1478 control patients. Those receiving alpha-blockers were significantly more likely to be stone-free (RR 1.12, 95% CI 1.07-1.16; P < 0.001). This effect was robust to 'trim-and-fill' adjustment. In those taking alpha-blockers there was a significant reduction in Clavien III-V complications and, on trim-and-fill adjustment, a significant reduction in Clavien I-II complications. There were also significant reduction in rates of steinstrasse, pain and requirement for auxiliary procedures. There was no significant difference in retreatment rates. These effects were robust to trim-and-fill adjustment. There is a modest increase in stone-free rates in those receiving alpha-blockers following SWL, with a reciprocal modest risk reduction for steinstrasse, pain and auxiliary procedures. However, alpha-blockers do not reduce the risk of requiring retreatment.

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