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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.

Abstract

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.

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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.
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