Implementing a Ureteric Magnetic Stent in the Kidney Transplant Setting: Report of 100 Consecutive Cases

Kidney transplantation (KT) is the treatment of choice for end-stage kidney disease. The double-J-stent has been used to prevent urological complications (UCs), but it requires cystoscopy extraction. The novel magnetic black star (MBS) stent provided with a customized retrieval device (9 or 15 Fr) has been developed to spare cystoscopy. Scope of the paper is to analyze MBS in 100 consecutive KTs.

We report a retrospective analysis of 100 consecutive KT performed between April 2015 and September 2018 using MBS (4.8 Fr, 15 cm) to protect Lich-Gregoir ureteroneocystotomy. MBS was removed 4 weeks after KT by either the 9 Fr (61 cases) or the 15 Fr (39 cases) retrieval device.

Intraoperative MBS insertion was straightforward in all cases, and its extraction was carried out in the outpatient setting in 93 patients. Extraction time was <30 seconds in 45 out of 61 patients (73.8%) and in 38 out of 39 patients (97.4%) using the 9 Fr and the 15 Fr retrieval device, respectively. In 15 patients, MBS removal took between 30 seconds and 3 minutes. Only 2 cases required extraction by cystoscopy. We observed 2 UC (ureteric leak and stenosis), 8 urinary tract infections, and 9 stent-related symptoms. 7 patients experienced distressing pain according to Visual Analog Scale for Pain.

In our cohort, MBS appeared to be safe and cost-effective. We advocate its routine implementation in KT because of an easy and comfortable extraction in the outpatient setting even by nondedicated staff, without detrimental impact on UC and urinary tract infection rates.