The effect of extracorporeal shock wave lithotripsy (ESWL) with an MPL9000 lithotriptor on renal hemodynamics and urine flow was investigated by 99mTc-DTPA renal scintigraphy. In the first-pass scintigrams obtained within 1 min after injection of 99mTc-DTPA, there was no significant change in the time to the maximum radioactivity level and the maximum radioactivity ratio at 1 day before ESWL and 1 day or 1 month after ESWL. However, analysis of 30-min scintigrams showed that urinary clearance of radioactivity was delayed in the treated kidney 1 day after ESWL, particularly in the region targeted by shock waves, despite the absence of overt urinary tract obstruction by residual stone fragments. This change was reversible and was no longer noted 1 month after ESWL. These results suggest that ESWL with the MPL9000 lithotriptor induces a focal and temporary decrease in urine flow in the treated kidney, but has little or no effect on renal hemodynamics.
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