PD50-10 EVALUATING THE ENCRUSTATION FEATURES DUE TO THE SHORT-TERM URETERAL STENT PLACEMENT USING MICRO-COMPUTED TOMOGRAPHY: THE RESULTS FROM A PROSPECTIVE STUDY

Abstract

You have accessJournal of UrologyCME1 May 2022PD50-10 EVALUATING THE ENCRUSTATION FEATURES DUE TO THE SHORT-TERM URETERAL STENT PLACEMENT USING MICRO-COMPUTED TOMOGRAPHY: THE RESULTS FROM A PROSPECTIVE STUDY Shinji Fukui, Takashi Yoshida, Kuniko Takemoto, and Hidefumi Kinoshita Shinji FukuiShinji Fukui More articles by this author , Takashi YoshidaTakashi Yoshida More articles by this author , Kuniko TakemotoKuniko Takemoto More articles by this author , and Hidefumi KinoshitaHidefumi Kinoshita More articles by this author View All Author Informationhttps://doi.org/10.1097/JU.0000000000002621.10AboutPDF ToolsAdd to favoritesDownload CitationsTrack CitationsPermissionsReprints ShareFacebookLinked InTwitterEmail Abstract INTRODUCTION AND OBJECTIVE: To evaluate the short-term encrustation formation and encrustation volume of the ureteral stent, focusing on the major stone components (i.e., calcium oxalate and calcium phosphate). METHODS: Eighty-four patients requiring ureteral stent placement after retrograde intrarenal surgery (RIRS) were enrolled. After stent removal on postoperative day 14, the encrustation volume on the stent surface was measured by micro-computed tomography. Of the 84 patients, 71 were eligible for this study, excluding seven patients with no encrustation, two patients with uric acid (1 patient) and cystine (1 patient), and four patients with no available data. The encrustation volume was evaluated by micro-CT, and the stone components and the component ratio were determined using infrared spectroscopy. RESULTS: All included patients had encrustation in the inner lumen of the stent. Compared to this, encrustation on the outer surface was observed only in 3 (4.2%) patients (p <0.001). Sixty-seven patients (94%) had calcium oxalate as the primary stone component, 42 (62%) of whom had pure calcium oxalate. Four patients (6%) had pure calcium phosphate as the primary stone component, three of whom had mixed stone with calcium phosphate. Cases with calcium oxalate showed a higher prevalence of stone components than those with calcium phosphate (p <0.001). However, cases with calcium phosphate stone had a significantly greater median inner encrustation volume compared to those with calcium oxalate stone (3.66 mm3 vs. 1.11 mm3; p <0.001). There was no difference observed in the encrustation volume on the outer surface between the two stone components (p=0.86). In multivariate analysis, crystalluria (p=0.013) and primary calcium phosphate component (p <0.001) were significantly associated with the increased total encrustation volume on the stent. CONCLUSIONS: This study revealed that the encrustation volume on the stent was significantly greater for calcium phosphate compared to calcium oxalate with the short-term indwelling ureteral stent. Thus, early stent removal may be recommended for patients with calcium phosphate stones. Source of Funding: No source of funding © 2022 by American Urological Association Education and Research, Inc.FiguresReferencesRelatedDetails Volume 207Issue Supplement 5May 2022Page: e840 Advertisement Copyright & Permissions© 2022 by American Urological Association Education and Research, Inc.MetricsAuthor Information Shinji Fukui More articles by this author Takashi Yoshida More articles by this author Kuniko Takemoto More articles by this author Hidefumi Kinoshita More articles by this author Expand All Advertisement PDF DownloadLoading ...