The Impact of Ureteral Stent Indwelling Duration on Encrustation Degree and Extraction Difficulty: A Retrospective Study

<b>Background/Objectives:</b> Ureteral stents are indispensable tools in contemporary urological practice; however, their prolonged indwelling is frequently associated with a spectrum of complications. This study aims to evaluate the correlation between indwelling duration and the extent of stent encrustation, as well as the impact on extraction difficulty. <b>Methods:</b> A retrospective analysis was conducted on 33 patients treated at Clinical County Emergency Hospital of Brașov between December 2023 and December 2024. All patients had polyurethane double-J ureteral stents placed. Parameters assessed included the degree of stent encrustation, discoloration, incidence of urinary tract infections (UTIs), and extraction difficulty. These were analyzed in relation to indwelling time and patient comorbidities. Statistical processing was performed using SPSS 23.0 software, with significance set at <i>p</i> < 0.05. <b>Results:</b> A statistically significant association was observed between longer stent indwelling times and higher grades of encrustation, particularly for the intervals of 45-90 days and over 90 days (<i>p</i> = 0.008 and <i>p</i> = 0.01, respectively). Low encrustation demonstrated correlations with certain comorbidities, whereas no statistically relevant associations were found for moderate and severe encrustation. Black coloration of the stents was strongly associated with UTIs caused by <i>Escherichia coli</i>, <i>Klebsiella</i> spp., and <i>Enterococcus</i> spp. (<i>p</i> < 0.001), as well as with extended indwelling durations (<i>p</i> < 0.001). No significant correlation was identified between the presence of UTIs and the degree of stent encrustation. <b>Conclusions:</b> Indwelling time is a critical determinant of both ureteral stent encrustation and discoloration, with direct implications for clinical decision-making regarding stent management and extraction planning. Timely removal and close monitoring are essential to reduce the risk of complications associated with long-term stent placement.