SWL literature

Abdelaziz H et al, 2014: The usefulness of stone density and patient stoutness in predicting extracorporeal shock wave efficiency: Results in a North African ethnic group.

Abdelaziz H, Elabiad Y, Aderrouj I, Janane A, Ghadouane M, Ameur A, Abbar M

Urology Department, University Military Hospital Med V., Hay Ryad, Rabat, Morocco.


INTRODUCTION: We determine the role of stone density and skin-to-stone distance (SSD) by non-contrast computed tomography of the kidneys, ureters and bladder (CT-KUB) in predicting the success of extracorporeal shock wave lithotripsy (ESWL). METHODS: We evaluated 89 patients who received ESWL for renal and upper ureteric calculi measuring 5 to 20 mm, over a 12-month period. The mean stone density in Hounsfield units (HU) and mean SSD in mm was determined on pre-treatment CT-KUB at the CT workstation. ESWL was successful if post-treatment residual stone fragments were ≤3 mm. : ESWL success was observed in 68.5% of patients. Mean stone densities were 505 ± 153 and 803 ± 93 HU in the ESWL successful and failure groups, respectively (p < 0.001, student's t-test). The mean SSD were 10.6 ± 2.0 and 11.2 ± 2.6 cm in ESWL successful and failure groups, respectively; this was not statistically significant. CONCLUSIONS: This study shows that stone density can help to predict the outcome of ESWL. We propose that stone density <500 HU are highly likely to result in successful ESWL. Conversely, stone densities >800 HU are less likely to be successful. 

Can Urol Assoc J. 2014 Jul;8(7-8):E567-9. doi: 10.5489/cuaj.1849.


Comments 1

Peter Alken on Monday, 27 October 2014 10:31

The retreatment rate is not given. Follow up was done with plane films.

The retreatment rate is not given. Follow up was done with plane films.
Thursday, 17 October 2019
Lohstampfestrasse 8
8274 Tägerwilen
Tel.: +41 (0)71 677 45 45
Fax: +41 (0)71 677 45 05