Effect of Renal Access Sheath on Functions

Study Overview
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Brief Summary
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Patients will be randomly divided into two groups in order to evaluate the effect of the size of the access sheath (Amplatz) used in the Percutaneous Nephrolithotomy (PCNL) operation on kidney functions. After dilatation, 22French (Fr) Amplatz sheath will be placed in the first group, while 28Fr Amplatz sheath will be placed in the second group. The functional difference will be evaluated with preoperative and postoperative 3rd-month kidney scintigraphies (diethylenetriamine pentaacetic acid (DTPA) and technetium-99m dimercaptosuccinic acid (DMSA). In addition, Kidney Injury Molecule-1 (KIM-1) levels will be measured in the urine in order to be a predictor of functional loss in the early period.

Detailed Description
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PCNL has been applied for the last 30 years as the primary and most effective treatment method in patients with kidney stones of 2 cm or larger. The primary purpose of the operation is to ensure stone-freeness. Another aim is to keep the damage to kidney functions to a minimum, thanks to the endoscopic intervention. In this respect, PCNL is superior to open surgery and reduces morbidity. Renal access, dilatation, and fragmentation are the 3 important stages of the operation, and access and dilation significantly affect the final results of PCNL. The size of the access sheath used as a result of dilation determines the size of the tract where the endoscopic intervention will be made, and not only affects the postoperative results and success but also determines the factors that may affect the kidney functions such as bleeding and loss of parenchyma in the kidney. There are studies showing that less bleeding, shorter hospital stay, and better postoperative pain control are achieved with the reduction of access sheath size. In addition to conventional PCNL, methods such as mini PCNL, micro PCNL, ultra-mini PCNL, and tubeless PCNL, where the diameter of the access sheath and endoscope are gradually decreasing, both increase success and reduce morbidity. In our study, in order to examine the postoperative functional results of 22 Fr and 28 Fr accessory sheath size; For the early period, the change in KIM-1 values, a validated biomarker in acute kidney injury, measured on the preoperative and postoperative day 1 will be proportioned between the groups, For the late period, we aimed to compare the kidney functions in the mid-long term by proportioning the DMSA and DTPA values at the preoperative and postoperative 3rd month.

Official Title
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The Effect of Renal Access Sheath Size Used During Percutaneous Nephrolithotomy on Postoperative Renal Functions

Conditions
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Kidney Function Tests, Treatment Outcome

Intervention / Treatment
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* Procedure: Percutaneous nephrolithotomy


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patients with 2-3 cm kidney stones Patients with an American Society of Anesthesiologists ≤2 score BMI: Patients between 20 and 35 kg/m2 Exclusion Criteria: Patients with preoperative renal failure Patients with multiple access Patients undergone renal transplantation Patients with renal anomalies (horseshoe kidney, solitary kidney, double collecting system, etc.) Patients with history of open kidney stones surgery and/or PCNL history Patients who cannot be stone-free in the postoperative period (fragments >4 mm in imaging) and require additional treatment intervention Patients with bleeding disorders Pregnant patients Patients with complete staghorn stones Patients with bilateral obstructive stones Patients with active infection

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 65 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Treatment
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: 22French (Fr)<br>After renal access, dilatation is provided up to 22Fr with a dilatator set, and fragmentation is started with a 19Fr nephroscope. | Procedure: Percutaneous nephrolithotomy<br>* percutaneous nephrolithotomy surgery, 22F amplatz sheath is used in one group, while 28F amplatz sheath is used in the other group.<br>|
| Experimental: 28F<br>After renal access, dilatation is provided up to 28Fr with a dilatator set, and fragmentation is started with a 25Fr nephroscope. | Procedure: Percutaneous nephrolithotomy<br>* percutaneous nephrolithotomy surgery, 22F amplatz sheath is used in one group, while 28F amplatz sheath is used in the other group.<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Differential function changes | Differential function changes in the operated kidney in postoperative DMSA and DTPA | 3 months | 
| Newly developed scar | Presence of newly developed scar in DMSA | 3 months | 
| KIM-1 | Change in urinary KIM-1 levels | 24 hours | 

Secondary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Creatinine | Postoperative changes in creatinine | 24 hours | 
| Glomerular filtration rate | Postoperative changes in glomerular filtration rate | 24 hours | 
| Stone-free rate | Postoperative stone-free rates | 24 hours | 
| Complications | Complications according to Clavian grading | 30 days | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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Percutaneous nephrolithotomy, Amplatz sheath