Abstract:Objective This study aims to compare the safety and efficacy of retrograde intrarenal surgery (RIRS) combined with a flexible-tip suction ureteral access sheath (S-UAS) versus percutaneous nephrolithotomy (PCNL) in the management of multiple renal and/or upper ureteral calculus.Methods A retrospective analysis was conducted on the clinical data of 81 patients with multiple renal and/or upper ureteral calculus who received RIRS combined with S-UAS or PCNL in this hospital from January 2023 to May 2025. They were divided into the RIRS group (43 cases) and the PCNL group (38 cases) according to different surgical methods. Observe the perioperative indicators, pain degree, renal function, stone free rate (SFR) and the occurrence of adverse reactions in the two groups.Results The operation time of the PCNL group was significantly shorter than that of the RIRS group, while the intraoperative blood loss of the RIRS group was significantly less than that of the PCNL group, the postoperative hospital stay was significantly shorter than that of the PCNL group, and the visual analogue scale (VAS) score at 24 hours after surgery was significantly lower than that of the PCNL group. The differences were all statistically significant (P < 0.05). There were no statistically significant difference in the hemoglobin (Hb) level 24 hours after the operation, levels of blood urea nitrogen (BUN) and creatinine (Cr) before and 24 h after the operation between the two groups (P > 0.05). In the subgroups, there was no statistically significant difference in the SFR between the two groups with stone diameters ≤ 2.0 cm (P > 0.05). Among the stones with a diameter > 2.0 cm, the SFR in the PCNL group was significantly higher than that in the RIRS group, and the difference was statistically significant (P < 0.05). There was no statistically significant difference in the incidence of complications between the two groups (P > 0.05).Conclusion S-UAS combined with RIRS and PCNL each present distinct advantages in the treatment of multiple upper urinary tract calculus. S-UAS-assisted RIRS is associated with less intraoperative blood loss and a shorter postoperative hospital stay. By contrast, PCNL achieves a higher SFR for calculus with a diameter greater than 2.0 cm. In clinical practice, the optimal surgical procedure should be determined through comprehensive evaluation of the patient’s individual condition and selected on an individualized basis.