Are the Stone Density and Location Useful Parameters for Small Kidney Stones?

NCT03503539 | Completed

• 1 other identifier: AbantIBU-AG001
• Study Type: interventional
• Target: 60
• Locations: 0 countries
• Sites: N/A

Brief Summary

The investigators aimed to evaluate whether these parameters could be guides for us in the selection of RIRS or Mini-PNL procedures in kidney stones that are smaller than 2 cm. The patients that have kidney stones smaller than two cm and be planned to undergo surgery were randomized into 2 groups prospectively. RIRS was performed in the RIRS group using a 7.5-F fiberoptic flexible ureterorenoscope while Mini-PCNL group was dilated up to 16.5F and mini-PCNL was performed with 12F nephroscopy. Preoperative characteristics, operative and postoperative results were compared in two groups. Thereafter, intra and intergroup comparisons were made to determine the effects of HU value, indicating the stone density, higher or less than 677 and the stone location on stone-free rates.

Conditions

Kidney Calculi; Kidney Stone

Outcome Measures

Primary Outcomes (1)

• Stone free rate

  Stone-free conditions were determined by low-dose spiral CT taken in postoperative third month

  1 year

Secondary Outcomes (1)

• Mean fluoroscopy time

  İntraoperative duration of flouroscopy

Study Arms (2)

Mini percutaneous nephrolithotomy

EXPERIMENTAL

All operations were performed or supervised by the same surgeon. Right after the patients in mini-PNL group were placed a 5F ureteral catheter with general anesthesia, they were had a prone position and the access was performed by choosing the optimal calyx to reach the stone following the contrast agent was given. The guide wire was then placed and the stones were broken with a laser lithotripter using a 12F nephroscope (Modular minimally invasive PCNL system, Karl Storz, Tuttlingen, Germany) following the dilatation using an one step dilator with a 16.5F access sheath. When necessary, stones were removed using the stone removal forceps. Right after a 14-Fr nephrostomy tube was inserted and an antegrade pyelography was taken, the operation was terminated.

Procedure: Mini percutaneous nephrolithotomy

Retrograde intrarenal surgery

ACTIVE COMPARATOR

Following the general anesthesia performed, a safety guide wire was placed and semirigid ureteroscopy (9.5 / 11.5F) was performed. Stones were fragmented using a 270 micron meter laser fiber with the help of 7.5-F fiber optic flexible ureterorenoscope after the placement of ureteral access sheat (9.5 / 11.5 F). Stone fragmentation was accomplished using a laser energy of 0.5-1.5 J and a rate of 5-15 Hz and adjusting this range according to stone hardness. 4.7F JJ stent was routinely placed at the end of the operation because of worries about possible edema etc. due to access sheath. In this group, access sheath could not be placed in 2 patients due to the small diameter of the ureter, and JJ stent was placed, and 2 weeks later, the procedure was performed as it was in the others.

Procedure: Retrograde intrarenal surgery

Interventions

Mini percutaneous nephrolithotomy PROCEDURE

Mini percutaneous nephrolithotomy

Retrograde intrarenal surgery PROCEDURE

Retrograde intrarenal surgery

Eligibility Criteria

• Sex: all
• Healthy Volunteers: No
• Age Groups: Child (0-17), Adult (18-64), Older Adult (65+)

You may qualify if:

• Patients were evaluated with non-contrast abdominopelvic CT after a detailed anamnesis and physical examination.
• Patients, who had a kidney stone with a maximum diameter of less than 2 cm and who did not prefer to undergo ESWL, were taken into the study.

You may not qualify if:

• Patients with anomalous kidneys, skeletal deformities, severe obesity (BMI\> 35) and those underwent ESWL treatment previously for the same stone were excluded from the study.

Sponsors & Collaborators

• Abant Izzet Baysal University: lead

Related Publications (6)

• Demirbas A, Resorlu B, Sunay MM, Karakan T, Karagoz MA, Doluoglu OG. Which Should be Preferred for Moderate-Size Kidney Stones? Ultramini Percutaneous Nephrolithotomy or Retrograde Intrarenal Surgery? J Endourol. 2016 Dec;30(12):1285-1289. doi: 10.1089/end.2016.0370.

  PMID: 27706948 RESULT

• Jacquemet B, Martin L, Pastori J, Bailly V, Guichard G, Bernardini S, Chabannes E, Bittard H, Kleinclauss F. Comparison of the efficacy and morbidity of flexible ureterorenoscopy for lower pole stones compared with other renal locations. J Endourol. 2014 Oct;28(10):1183-7. doi: 10.1089/end.2014.0286. Epub 2014 Sep 12.

  PMID: 24811281 RESULT

• Resorlu B, Unsal A, Gulec H, Oztuna D. A new scoring system for predicting stone-free rate after retrograde intrarenal surgery: the "resorlu-unsal stone score". Urology. 2012 Sep;80(3):512-8. doi: 10.1016/j.urology.2012.02.072. Epub 2012 Jul 26.

  PMID: 22840867 RESULT

• Resorlu B, Oguz U, Resorlu EB, Oztuna D, Unsal A. The impact of pelvicaliceal anatomy on the success of retrograde intrarenal surgery in patients with lower pole renal stones. Urology. 2012 Jan;79(1):61-6. doi: 10.1016/j.urology.2011.06.031.

  PMID: 21855968 RESULT

• Turk C, Petrik A, Sarica K, Seitz C, Skolarikos A, Straub M, Knoll T. EAU Guidelines on Diagnosis and Conservative Management of Urolithiasis. Eur Urol. 2016 Mar;69(3):468-74. doi: 10.1016/j.eururo.2015.07.040. Epub 2015 Aug 28.

  PMID: 26318710 RESULT

• Gucuk A, Uyeturk U, Ozturk U, Kemahli E, Yildiz M, Metin A. Does the Hounsfield unit value determined by computed tomography predict the outcome of percutaneous nephrolithotomy? J Endourol. 2012 Jul;26(7):792-6. doi: 10.1089/end.2011.0518. Epub 2012 Feb 10.

  PMID: 22201298 RESULT

MeSH Terms

Conditions

Kidney Calculi

Condition Hierarchy (Ancestors)

Nephrolithiasis; Kidney Diseases; Urologic Diseases; Female Urogenital Diseases; Female Urogenital Diseases and Pregnancy Complications; Urogenital Diseases; Urolithiasis; Urinary Calculi; Male Urogenital Diseases; Calculi; Pathological Conditions, Anatomical; Pathological Conditions, Signs and Symptoms

Study Design

• Study Type: interventional
• Phase: not applicable
• Allocation: RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: OTHER
• Responsible Party: PRINCIPAL INVESTIGATOR
• PI Title: Associate Professor

Study Record Dates

• First Submitted: March 28, 2018
• First Posted: April 20, 2018
• Study Start: April 1, 2016
• Primary Completion: May 1, 2017
• Study Completion: June 1, 2017
• Last Updated: April 20, 2018

Record last verified: 2018-04

Data Sharing

• IPD Sharing: Will not share