An interventional study of Aspiration-assisted ureteral access sheath and Standard ureteral access sheath in Kidney Stone, sponsored by Cengiz Canakci, MD. Not yet recruiting. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-06-03.
Sponsored by Cengiz Canakci, MD · Not applicable, Interventional, and Diagnostic
This study aims to evaluate changes in renal parenchyma following retrograde intrarenal surgery (RIRS) using shear-wave elastography. Renal elastography measurements will be performed in patients undergoing RIRS for kidney stones on the preoperative day, on the first postoperative day, and on the seventh postoperative day. Postoperative pain scores, perioperative outcomes, stone-free status and complications will also be assessed.
598 studies on the registry are indexed under Kidney Calculi; 163 are open to participants now.
This study's planned enrollment of 60 is below the median of 90 across 461 interventional studies indexed under Kidney Calculi.
Browse Kidney Calculi studies →Cengiz Canakci, MD is the lead sponsor of 2 studies on the registry; 1 is open to participants now.
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Exclusion Criteria:
Patients will undergo retrograde intrarenal surgery using an aspiration-assisted ureteral access sheath.
Device: Aspiration-assisted ureteral access sheath
Patients will undergo retrograde intrarenal surgery using a standard ureteral access sheath.
Device: Standard ureteral access sheath
Patients undergoing retrograde intrarenal surgery using an aspiration-assisted ureteral access sheath
Standard ureteral access sheath used during retrograde intrarenal surgery.
Renal Cortical Shear-Wave Elastography Values (kPa)
Renal cortical stiffness will be quantitatively evaluated using ultrasound-based shear-wave elastography. Measurements will be obtained from multiple regions of the renal cortex, and the mean value of these measurements will be recorded in kilopascals (kPa). All examinations will be performed using the same ultrasound device and standardized protocol by a single experienced radiologist blinded to the study groups.
Time frame: Elastography assessments will be performed preoperatively, on postoperative day 1, and on postoperative day 7 to evaluate perioperative renal parenchymal changes.
Postoperative Complications
Perioperative and postoperative complications assessed according to the Clavien-Dindo classification system.
Time frame: From surgery to postoperative day 30
Serum Creatinine Level
Serum creatinine levels measured to evaluate renal function changes following retrograde intrarenal surgery.
Time frame: Preoperative baseline, postoperative day 1, and postoperative day 7
Postoperative Fever and Sepsis
Occurrence of postoperative fever (\>38°C) and/or sepsis following surgery.
Time frame: From surgery to postoperative day 30
Stone-Free Rate
Stone-free status assessed by postoperative imaging.
Time frame: Postoperative month 1
Renal Resistive Index
Renal resistive index values measured using Doppler ultrasonography to evaluate renal vascular resistance following retrograde intrarenal surgery.
Time frame: Preoperative baseline, postoperative day 1 and postoperative day 7
Mayo Adhesive Probability Score
Perinephric fat adhesion severity assessed using the Mayo Adhesive Probability (MAP) Score based on preoperative computed tomography findings. The MAP Score ranges from 0 to 5, with higher scores indicating a greater likelihood of adherent perinephric fat and increased surgical complexity.
Time frame: Preoperative period
Postoperative Pain Scores
. Postoperative pain intensity was assessed using the Visual Analogue Scale (VAS), a 10-point scale ranging from 0 to 10, where 0 indicates no pain and 10 represents the most severe pain imaginable. Higher scores indicate greater pain intensity.
Time frame: preoperative, postoperative 6th hour, and postoperative 24th hour.
No study locations are listed for this record.
Plan to share: No
No publications or documents are linked to this record.
This study is not yet recruiting, as verified in May 2026. You cannot join it, but the record below documents what was studied.
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Cengiz Canakci, MD