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Fate of residual fragments after successful extracorporeal shock wave lithotripsy
Author(s) -
Shigeta Masanobu,
Kasaoka Yoshinobu,
Yasumoto Hiroaki,
Inoue Katsumi,
Usui Tsuguru,
Hayashi Mutsuo,
Tazuma Susumu
Publication year - 1999
Publication title -
international journal of urology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.172
H-Index - 67
eISSN - 1442-2042
pISSN - 0919-8172
DOI - 10.1046/j.1442-2042.1999.06443.x
Subject(s) - medicine , hydronephrosis , extracorporeal shock wave lithotripsy , urology , lithotripsy , urinary system , surgery , bacteriuria , renal function
Purpose: The aim of the present study was to investigate the reason residual fragments from upper urinary tract calculi failed to clear after successful extracorporeal shock wave lithotripsy (ESWL). Methods: Risk factors were analyzed in 161 patients with residual fragments (≤ 4 mm) that had remained for more than 3 months after ESWL. The factors examined in the present study were gender, a history of urolithiasis, the number, location and size of stones, hydronephrosis 3 months after ESWL and bacteriuria before ESWL. The mean follow‐up period was 20.0 months (range 6–69 months). Results: The overall stone‐free rate was 14.3%. The stone‐free rate in patients with multiple stones or hydronephrosis 3 months after ESWL was significantly lower than that in patients without these conditions ( P < 0.05 and P < 0.01, respectively). The cumulative non‐clearance rate in patients with hydronephrosis was significantly higher than in patients without this condition ( P < 0.05). Results of Cox’s proportional hazards model indicated that hydronephrosis was the most important and only significant factor for failure to clear of the seven factors investigated ( P < 0.05). Conclusion: Hydronephrosis was most highly correlated with the fate of residual fragments after ESWL.