The effect of piezoelectric shock wave lithotripsy focus size on renal stones fragmentation: A prospective randomized study

Articles in Press

Document Type : Original Article

Authors

1 Lecturer Of Urology Faculty Of Medicine , Benha University

2 Professor Of Urology Faculty of medicine, Benha University

3 Professor Of Urology Faculty Of Medicine , Benha University

4 Assistant lecturer of Urology, Benha University

5 Lecturer Of Urology Faculty Of Medicine, Benha University

Abstract

In patients presenting with urolithiasis, shock wave lithotripsy (SWL) is an option in management. The objective is to evaluate the efficacy of two different focal sizes of a piezoelectric extracorporeal lithotripter on renal stone fragmentation. The study was carried out on 150 patients with radio-opaque renal stones up to 20 mm seeking treatment by SWL. Patients were divided randomly into two equal groups. F1 focus = 2 mm, 126 MPa (Megapascal) was used for Group A, and F2 focus = 4 mm, 119 MPa, was used for Group B. After 3 months, KUB is done to determine the success of stone disintegration. There were insignificant variations between the studied groups regarding loin pain, loin pain duration, stone size, stone sites, density, numbers, and hydronephrosis (P-value > 0.05). The most frequent site of stones in group A and B was the mid calyx (29.5% and 33.3%, respectively). There were insignificant variations between the studied groups regarding residual after 3 months, size of residual, and successful stone disintegration rate (P-value > 0.05). Regarding complications, colic was significantly higher in Group B (22.7% vs. 9.3%, P = 0.026). Fever and hematuria were insignificantly different between the studied groups (P-value > 0.05). In conclusion, different focus sizes with fixed intensity and frequency result in no significant differences concerning stone fragmentation. However, a combination of both F1 and F2 is recommended to achieve better results. 

Keywords

Benha Medical Journal

Articles in Press, Accepted Manuscript
Available Online from 28 April 2024

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