Radionuclide Evaluation Pré-and Postextracorporeal Shock Wave Lithotripsy for Renal Calculi

Forty-two patients were evaluated pre- and postextracorporeal shock wave lithotripsy (ESWL) using ["TcJDTPA renography. A quantitative evaluation showed that the relative renal function decreased 2-3 days post-ESWL on the treated side, and the parenchymal transit time index (PTTI) increased 2-3 days post-ESWL (p < 0.001) on the treated side and returned to the pretreatment level by 3 wk post-ESWL. The untreated side showed an increase in PTTI 2-3 days post-ESWL (p < 0.01), which returned to normal by 3 wk post-ESWL. A significantly greater increase in PTTI was seen in patients who received>1,000 shocks as compared with those who received <1,000 shocks. Five patients developed obstructing uropathy post-ESWL, when stone fragments caused ureteric obstruction. J NucÃ-Med 28:1284-1289,1987 /xtracorporeal shock wave lithotripsy (ESWL) is a new modality used for treating renal lithiasis (1,2). The principle on which ESWL works is based on the fact that shock waves are generated when a mass moves in a certain medium with a velocity higher than that o