体外衝撃波砕石術後のStone street発生症例における尿管ステントの有用性について
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対外衝撃波砕石術(ESWL)施行後,Stone street(SS)を発生した症例を対象とし,ステント留置の有用性について検討を行った.対象者530名のうちSSの発生を40例に認め,事前のステント留置は147例に対し施行された.SS発生率はESWL施行前にステントを留置された(stent)群17.2%,非留置(in situ)群29.4%であった.20mm以下の無症状の結石はin situで治療することが望ましいと考えられた.21-30mmの結石については,ステントはSSの発生を抑制する可能性があると考えられた.またステント留置中のSS発生例に対しては,ステントの抜去が治療の選択肢の1つとなり得ると思われたWe reviewed the records of the 530 patients with urinary stones (renal stones: 243; ureter stones 287) who received extracorporeal shock wave lithotripsy (ESWL) (MFL5000; Dornier), from January 1995 to July 2002, retrospectively and determined whether the ureteral stent affected the incidence rate of stone street (SS). We also assessed the effect of ureteral stent on the subsequent management for SS. Forty patients (7.5%) developed SS. Twenty patients were inserted a ureteral stent prior to ESWL (stent group), and 20 patients were performed ESWL without a ureteral stent (in situ group). In the stent group, the most common (80.0%) location for SS was in the upper third ureter, while in the in situ group, SS mostly developed in the distal third ureter (60.0%). The incidence of SS did not differ significantly between the two groups when the size of renal and ureter stones was below 30 and 20 mm, respectively. When the renal stones were larger than above 30 mm, the incidence of SS in the stent group was significantly higher than that in the in situ group. SS disappeared spontaneously with stone passage in 10 of the patients in in situ group, but in only 1 patient in the stent group. In the stent group, 15 patients were treated for SS by removal of ureteral stent regardless of stone diameter. We conclude that ESWL should be performed without a ureteral stent when the stone diameter is below 20 mm. When the ureteral stent is thought to interfere with the delivery of stone fragments, the decision to remove it should be made as soon as possible.
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