Prestenting improves stone clearance of ureteroscopic lithotripsy

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  • PrestentingによるTUL成績の向上
  • Prestenting ニ ヨル TUL セイセキ ノ コウジョウ

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Abstract

  This study was conducted to determine the impact of stent placement before ureteroscopy on stone clearance. <br>  One-hundred and seventy-one patients（133 nonstented and 38 prestented）underwent ureteroscopic surgery from 2010 to 2012. Median stone sizes were 8 and 9 mm in non- and presented groups, respectively. The 38 patients received stents before stone management because of infection（26 cases）, failure of previous ureteroscopic procedures（10 cases）, and after previous lithotripsy for a prior（i.e., more distal）stone（2 cases）. <br>  Strict stone-free rates with kidney and proximal ureter stones were 40/64（63%）without previous stents and 24/29（83%）with prestenting（P=0.051）. Those of mid or distal ureteral calculi were 66/69（96%）and 9/9（100%）, respectively. Multiple logistic regression analysis revealed that the stone location and prestenting were independent prognostic factors determining stone clearance after ureteroscopy. <br>  Although routine stent placement is not necessary before all ureteroscopic procedures, prestenting was associated with significantly higher stone-free rates, especially with renal and proximal ureteral stones.

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