Cass A S
Midwest Urologic Stone Unit, Hennepin County Medical Center, Minneapolis, Minnesota.
J Urol. 1992 Jun;147(6):1495-8. doi: 10.1016/s0022-5347(17)37606-1.
Second generation tubless lithotriptors allow for easy prone positioning of patients, resulting in increased use of extracorporeal shock wave lithotripsy (ESWL) for calculi in the ureter, especially in the mid and lower third portions. The 3-month stone-free rate with single stones using a Dornier HM3 and a Medstone STS lithotriptor in the upper ureter was 79% (316 patients) and 81% (188), respectively, while in the mid ureter it was 60% (20 patients) and 81% (32), respectively, and in the lower ureter it was 80% (5 patients) and 85% (26), respectively. The retreatment rate with single stones using the Dornier HM3 and the Medstone STS devices was 5% and 4%, respectively, in the upper ureter, 13% and 12%, respectively, in the mid ureter, and 0% and 5%, respectively, in the lower ureter. The second procedure rate after ESWL with single stones using the Dornier HM3 and the Medstone STS units was 6% and 6%, respectively, in the upper ureter, 15% and 16%, respectively, in the mid ureter, and 0% and 17%, respectively, in the lower ureter. Expectant management is still an acceptable method to treat small ureteral stones, and it is questionable whether ESWL is the appropriate treatment for lower third ureteral stones compared to equally effective and less expensive ureteroscopy.
