![]() ROC curve analysis revealed good power of UWT in discrimination of stone impaction in all patients at a cut-off of 3.8 mm, in patients with stone size ≤ 10 mm at a cut-off of 4.1 mm and in patients with stone size > 10 mm at a cut-off of 3.0 mm. In patients with stone size > 10 mm, stone impaction was related to higher UWT, more stone number, and higher frequency of stones located in the lower ureter. In the former group, we found that stone impaction was significantly associated with higher PAPD, PUD, and UWT. Patients were stratified into those with stone size ≤ 10 mm and others with stone size > 10 mm. ![]() ![]() They comprised 74 patients (48.1%) with impacted stones and 80 (51.9%) with non-impacted stones. The study included 154 patients subjected to URSL. Collected stone characteristics were stone size, side, number, site, and density. Radiological data comprised the presence of hydronephrosis, anteroposterior pelvic diameter (PAPD), proximal ureteric diameter (PUD), and maximum UWT at the stone site. This study included 154 patients submitted to URSL for ureteral stones. To evaluate the role of preoperative UWT in the prediction of impaction of ureteral stones stratified according to stone size in ureteroscopic laser lithotripsy.
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