NCT05350423

Trial Assessing Renal Damage During Ureteroscopy

Use of Urinary Biomarkers to Quantify Degree of Renal, Parenchymal and Urothelial Damage During Ureteroscopy

• Status: Completed
• Phase: N/A
• Study type: Interventional
• Enrollment: 108 (actual)
• Sponsor: Icahn School of Medicine at Mount Sinai · Academic / Other
• Sex: All
• Age: 18 Years
• Healthy volunteers: Not accepted

Summary

This is an ongoing randomized controlled trial of patients undergoing URSLL with unilateral non-obstructing renal stones. Patients are randomized to undergo URSLL with either the TFL or Ho:YAG laser. Each patient's urine is collected immediately pre-op (V1), 1 hour post-op (V2), and 10 days post-op (POD#10, V3). Samples are analyzed by enzyme-linked immunosorbent assay (ELISA) for the following biomarkers: Kidney injury molecule-1 (KIM-1), Neutrophil gelatinase-associated lipocalin (NGAL), and β2-microglobulin (β2M), then normalized to urine creatinine.

Detailed description

Patients scheduled for ureteroscopic laser lithotripsy (URSLL) will be screened and if eligible and agreeable, enrolled into the study. Patients will then be randomized preoperatively via block randomization in groups of 5 to receive lithotripsy with either Ho:YAG or TFL laser intraoperatively. All patients enrolled will have a ureteral stent placed at the end of the procedure. After induction of anesthesia but before any surgical intervention, the surgeon will empty the bladder and collect a sample of urine that will serve as the "Preoperative Urine Sample". One hour following the end of the procedure, a second sample of urine will be collected from the Foley catheter that will serve as the "Immediate Post-Op Urine Sample". A third and final urine sample of urine will be collected approximately 10 days postoperatively just prior to stent removal and serve as the "Follow-up urine sample". Patients for whom all three urine specimens are collected will be considered to have completed the study. Immediately after collection, the samples will be stored in a freezer at -80 ºC. All samples will be analyzed for biomarkers of renal parenchymal injury to determine differences between pre- and postoperative concentrations. The biomarkers that will be quantified include Kidney Injury Molecule-1 (KIM-1), Neutrophil gelatinase-associated lipocalin (NGAL), and Beta-2-microglobulin (B2M). Concentrations of urinary biomarkers are determined in duplicate from urine samples using the multiplex cytokine panel \[MILLIPLEX MAP Human Kidney Injury Panel 1 (KIM-1), Panel 2 (N-GAL2) and Panel 3 (B2 microglobulin)- Millipore Corp., Burlington, MA\] as per manufacturer's instructions. The urine samples were 1:2 diluted for Panel 1, 1:100 diluted for Panel 2 and 1:500 diluted for Panel 3. The kit provided lyophilized pre-mixed standard was reconstituted and used to generate 6-point serial dilutions and run on assay plate along with the samples. Analyte median fluorescent intensity (MFI) values were obtained. Anticipate enrollment is 108 patients total (54 in each cohort) to adequately power the study based upon an alpha of 0.05 statistical power of 0.80.

Conditions

• Nephrolithiasis

Interventions

Type	Name	Description
DEVICE	Thulium Fibre Laser	The TFL is a relatively new laser in the field of urology. First introduced on the market in 2017, it offers theoretically superior stone dusting qualities and smaller fiber sizes to allow for better irrigation.
DEVICE	Holmium:Yttrium-Aluminum-Garnet	The Ho:YAG is currently the most commonly used laser in the field of urology and for the better part of the last 3 decades has been considered the gold standard for laser lithotripsy.

Timeline

• Start date: 2021-10-22
• Primary completion: 2022-11-28
• Completion: 2022-11-28
• First posted: 2022-04-28
• Last updated: 2023-12-07
• Results posted: 2023-12-07

Locations

1 site across 1 country: United States

Regulatory

• FDA-regulated device study