An observational 3-year follow-up study for postoperative renal function changes assessed by <sup>99 m</sup>Tc-DTPA scintigraphy and predictive factors after miniaturized percutaneous nephrolithotomy and retrograde intrarenal surgery.

assessed renal function using 99 m Tc-DTPA at 1 year postoperatively, where high preoperative serum creatinine levels and a history of previous stone procedures showed borderline significance in renal function deterioration [ 10 ].

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These analyses included both the group that was followed up for the entire 36 months and the group that showed normal results and was followed up only until the 1 st or 2nd year (Table 3 A), as well as those followed up for the full 36 months (Table 3 B). Table 3 A shows that, in the univariate analysis, the presence of preoperative hydronephrosis was the only significant predictor of renal function aggravation, while S-ReSC > 3 was borderline significant.

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