Stone, KidneyPhase 3NCT04764071
Ultra-Mini Versus Standard Percutaneous Nephrolithotomy For Management Of Renal Calculi. A Randomized Controlled Trial.
A Phase 3 study testing percutaneous nephrolithotomy and ultra-mini percutaneous nephrolithotomy in people with Stone, Kidney, run by Ain Shams University at 1 site in Egypt.
Trial summary
Renal stones are one of the most common urological problems and there are multiple methods for their management such as percutaneous nephrolithotomy, mini and ultra-mini percutaneous nephrolithotomy, flexible ureteroscopy and laser lithotripsy, and extracorporeal shock wave lithotripsy. Read more about this study
- Who is it for?
- Ages 18 years and older
- Conditions the study is for
- Stone, Kidney
- What is being tested?
- percutaneous nephrolithotomy and ultra-mini percutaneous nephrolithotomy
- Type of treatment
- Surgery or procedure
- Could I receive a placebo?
- No, everyone receives an active treatment
- How many people
- 60 participants
- Where
- 1 siteEgypt
- Study dates
- 28 Feb 2021to 1 Jun 2022
- Phase
- Phase 3
- Are there results?
- None posted in the registry
Key requirements
Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.
- Ages 18 years and older
- All sexes
- No healthy volunteers
- Adult, Older adult
Who may be able to join
- adult patient aged over 18 with renal stone between 1 and 2 cm
Who cannot join
- patient with a single kidney.
- Renal stones larger than 2 cm or less than 1 cm.
- Patients with uncontrolled co-morbidities (hypertension, diabetes mellitus, cardiac disease, chest disease).
- Patients with active urinary tract infection.
- Patients with other anatomic renal abnormalities (congenital renal malformations such as horseshoe kidney, polycystic kidney disease, etc.). and Patients with severe skeletal deformity.
- Pregnant women.
- Patients with Uncorrectable bleeding disorder.
- Patients who underwent renal transplantation or urinary diversion
Trial locations and contacts
1 site in 1 country.
Egypt1 site, 1 recruiting
- Recruiting
Ain Shams University hospitals
Cairo, 11367
Ashraf Satour, master degree, 01000396284, ashrafsatour@yahoo.com
About this study
Official title: Safety And Efficacy Of Ultra-Mini Percutaneous Nephrolithotomy In Comparison With Standard Percutaneous Nephrolithotomy For Management Of Renal Calyceal Calculi 1 Cm To 2 Cm In Size. Comparative Randomized Prospective Study
Renal stones are one of the most common urological problems and there are multiple methods for their management such as percutaneous nephrolithotomy, mini and ultra-mini percutaneous nephrolithotomy, flexible ureteroscopy and laser lithotripsy, and extracorporeal shock wave lithotripsy. percutaneous nephrolithotomy is the treatment of choice for the management of renal calculi, in spite of the increasing stone clearance rate, the complication rate of this procedure is relatively higher.
Read the detailed description
Nephrolithiasis is a major worldwide source of morbidity, constituting a common urological disease affecting 10-15% of the world population. Consistent technical advancements provide surgeons and patients with several options for the treatment of renal calculi, including extracorporeal shock wave lithotripsy (ESWL), percutaneous nephrolithotomy (PCNL), retrograde intrarenal surgery (RIRS), and conventional open surgery.
Percutaneous nephrolithotomy (PCNL) is generally considered a gold standard in renal stones particularly larger than 2cm or lower calyceal larger than 1cm offering high stone-free rates after the first treatment as compared to the other minimal invasive lithotripsy techniques.
Percutaneous nephrolithotripsy (PCNL)is a procedure to remove kidney stones from the kidney through a small incision in the skin and it was initially described in the literature by Fernström and Johansson in 1976. Traditionally, the prone position was considered the only position to obtain renal access for PCNL. In 1987, Valdivia Urìa presented the supine PCNL.
PCNL is also recommended in the case of smaller stones in patients with contraindications for shockwave lithotripsy (SWL), such as shockwave resistant stones and anatomical malformations, or when a patient elects PCNL as a procedure of higher efficacy. However, serious complications although rare should be expected following this percutaneous procedure as, Perioperative bleeding, urine leakage from nephrocutaneous tract, pelvicalyceal system injury, pain.( Kyriazis et al 2015) colon injury, hydrothorax, pneumothorax, prolonged leak, sepsis, ureteral stone, vascular injury and acute loss of kidney, all are individually confronted complications after PCNL.
PCNL techniques include: standard PCNL (S-PCNL), mini-PCNL (also called miniperc), ultra-mini-PCNL (UM-PCNL) and the recently introduced micro-PCNL. One of the most important differences between the various PCNL techniques is the size of renal access, which contributes to the broad spectrum of complications and outcomes.
- Conditions
- Stone, Kidney
- Being tested
- percutaneous nephrolithotomy, ultra-mini percutaneous nephrolithotomy
- Medical subject headings
- Kidney Calculi
What participants receive
What participants receive. In a randomised study each person is assigned to one group by chance.
percutaneous nephrolithotomyProcedure or surgery
percutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 30F.
ultra-mini percutaneous nephrolithotomyProcedure or surgery
percutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 12-14 F fascial dilator was used to dilate the nephrostomy tract to pass the 13 F semi-rigid plastic sheath.
| Study group | Role | What they receive |
|---|---|---|
| percutaneous nephrolithotomy | Active comparator | Patients are positioned in the lithotomy position and a 6F ureteral catheter is placed and the bladder is drained with a 16F urethral Foley catheter. After ureteral catheterization, patients are placed in the prone position, and percutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 30F. Pneumatic lithotripter is used for fragmentation and stone removal is accomplished with retrieval graspers through a rigid 22F nephroscope. An 18-24 F nephrostomy tube is placed at the end of the operation. Receives: Procedure: percutaneous nephrolithotomy |
| ultra-mini percutaneous nephrolithotomy | Experimental | Patients are positioned in the lithotomy position and a 6 F ureteral catheter is placed and the bladder is drained with a 16F urethral Foley catheter. After ureteral catheterization, patients are placed in the prone position, and percutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 12-14 F fascial dilator was used to dilate the nephrostomy tract to pass the 13 F semi-rigid plastic sheath. Then, a 9.5-F, rigid ureteroscope (KARL STORZ Medical Instruments) was introduced to the sheath. The renal stones were broken into pieces using holmium laser lithotripsy. Finally, the ureteroscope and sheath were removed and the tract site was packed for 2-3 min. then placement of double J stent will be done according to the decision of the operating surgeon for 3 to 4 weeks. Receives: Procedure: ultra-mini percutaneous nephrolithotomy |
What is being measured
The primary outcome is the main question the study is designed to answer.
stone free rate of patients with renal stones by non contrast CT scan
efficacy of the procedure to clear renal stones completely in single session, non contrast CT will evaluate the stone burden and compare it to the preoperative measurement
Measured: first day postoperative
Secondary outcomes (5)
operative time of both procedures
time of each procedure in minutes from the lithotomy positioning till completion of the procedure
Measured: intraoperative finding
hospital stay of the patient
duration till patient is discharged in days
Measured: 1 to 3 days postoperative
hemoglobin drop of the patients
decrease in the hemoglobin level in comparison to the preoperative results
Measured: first day postoperative
postoperative urine leakage from the surgical wound
urine leakage from the nephrostomy site if it present or not as document during surgical dressing by the attending physician
Measured: first day postoperative
cost analysis of both procedure
cost of each procedure including operative cost and postoperative stay in Egyptian Pound
Measured: 3 days postoperative
Timeline
From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.
- First posted21 Feb 2021
- Study start28 Feb 2021 (estimated)
- Primary completion28 Feb 2022 (estimated)
- Study completion1 Jun 2022 (estimated)
Resources
- Official record on ClinicalTrials.govThe registry entry this page is built from, with its full change history.
- Other trials for Stone, KidneyStudies of the same condition, open and under way.
- More trials run by Ain Shams UniversityThe sponsor's other registered studies.
- What the trial phases meanHow a treatment moves from first tests in people to approval.
More details
For doctors and researchers: how the study is designed, who runs it, and its registry IDs.
Study design
- Study type
- Interventional
- Phase
- Phase 3
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Model description
- To compare the difference between the two procedures regarding stone-free rates, operative time, hospital stay, procedures cost, and operative complications including blood loss, the need for blood transfusion, and extravasation or urine leakage
- Masking
- Triple blind
- Who is masked
- Participant, Investigator, Outcomes assessor
- Enrolment
- 60 participants (estimated)
Sponsor and investigators
- Lead sponsor
- Ain Shams University
- Sponsor type
- University, hospital or other
- Responsible party
- Principal investigator, Ahmed Maher Gamil Ahmed Higazy, Ain Shams University
IDs, dates and publications
- ClinicalTrials.gov ID
- NCT04764071
- Sponsor's protocol ID
- MD 06 /2020
- Status last verified
- Feb 2021
- First submitted
- 14 Feb 2021
- Last updated
- 21 Feb 2021
- Results posted
- No
- Data monitoring committee
- Yes
- FDA-regulated drug
- No
- FDA-regulated device
- No
- Individual data sharing
- Undecided: To compare the difference between the two procedures regarding stone-free rates, operative time, hospital stay, procedures cost, and operative complications including blood loss, the need for blood transfusion, and extravasation or urine leakage.
Study at a glance
From the registry record, last updated by the sponsor on 21 Feb 2021. Recruitment status is as the sponsor reported it: confirm with the study team.
- Official title
- Safety And Efficacy Of Ultra-Mini Percutaneous Nephrolithotomy In Comparison With Standard Percutaneous Nephrolithotomy For Management Of Renal Calyceal Calculi 1 Cm To 2 Cm In Size. Comparative Randomized Prospective Study
- ClinicalTrials.gov ID
- NCT04764071
- Acronym / sponsor ID
- MD 06 /2020
- Conditions
- Stone, Kidney
- Phase
- Phase 3
- Study type
- Interventional
- Recruitment status
- Unknown status
- Enrolment
- 60 participants (estimated)
- Lead sponsor
- Ain Shams UniversityUniversity, hospital or other
- Study start
- 28 Feb 2021 (estimated)
- Primary completion
- 28 Feb 2022 (estimated)
- Study completion
- 1 Jun 2022 (estimated)
- First posted
- 21 Feb 2021 (actual)
- Results
- Not posted in the source record
Clinical summary
The research question as the sponsor registered it. This describes what the study plans to test, not what it found.
Renal stones are one of the most common urological problems and there are multiple methods for their management such as percutaneous nephrolithotomy, mini and ultra-mini percutaneous nephrolithotomy, flexible ureteroscopy and laser lithotripsy, and extracorporeal shock wave lithotripsy. percutaneous nephrolithotomy is the treatment of choice for the management of renal calculi, in spite of the increasing stone clearance rate, the complication rate of this procedure is relatively higher.
Detailed description
Nephrolithiasis is a major worldwide source of morbidity, constituting a common urological disease affecting 10-15% of the world population. Consistent technical advancements provide surgeons and patients with several options for the treatment of renal calculi, including extracorporeal shock wave lithotripsy (ESWL), percutaneous nephrolithotomy (PCNL), retrograde intrarenal surgery (RIRS), and conventional open surgery.
Percutaneous nephrolithotomy (PCNL) is generally considered a gold standard in renal stones particularly larger than 2cm or lower calyceal larger than 1cm offering high stone-free rates after the first treatment as compared to the other minimal invasive lithotripsy techniques.
Percutaneous nephrolithotripsy (PCNL)is a procedure to remove kidney stones from the kidney through a small incision in the skin and it was initially described in the literature by Fernström and Johansson in 1976. Traditionally, the prone position was considered the only position to obtain renal access for PCNL. In 1987, Valdivia Urìa presented the supine PCNL.
PCNL is also recommended in the case of smaller stones in patients with contraindications for shockwave lithotripsy (SWL), such as shockwave resistant stones and anatomical malformations, or when a patient elects PCNL as a procedure of higher efficacy. However, serious complications although rare should be expected following this percutaneous procedure as, Perioperative bleeding, urine leakage from nephrocutaneous tract, pelvicalyceal system injury, pain.( Kyriazis et al 2015) colon injury, hydrothorax, pneumothorax, prolonged leak, sepsis, ureteral stone, vascular injury and acute loss of kidney, all are individually confronted complications after PCNL.
PCNL techniques include: standard PCNL (S-PCNL), mini-PCNL (also called miniperc), ultra-mini-PCNL (UM-PCNL) and the recently introduced micro-PCNL. One of the most important differences between the various PCNL techniques is the size of renal access, which contributes to the broad spectrum of complications and outcomes.
Study design
- Primary purpose
- Treatment
- Allocation
- Randomised
- Intervention model
- Parallel groups
- Masking
- Triple blind (participant, investigator, outcomes assessor)
- Number of arms
- 2
- Model description
- To compare the difference between the two procedures regarding stone-free rates, operative time, hospital stay, procedures cost, and operative complications including blood loss, the need for blood transfusion, and extravasation or urine leakage
| Arm | Type | Receives |
|---|---|---|
| percutaneous nephrolithotomy | Active comparator | Procedure: percutaneous nephrolithotomyPatients are positioned in the lithotomy position and a 6F ureteral catheter is placed and the bladder is drained with a 16F urethral Foley catheter. After ureteral catheterization, patients are placed in the prone position, and percutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 30F. Pneumatic lithotripter is used for fragmentation and stone removal is accomplished with retrieval graspers through a rigid 22F nephroscope. An 18-24 F nephrostomy tube is placed at the end of the operation. |
| ultra-mini percutaneous nephrolithotomy | Experimental | Procedure: ultra-mini percutaneous nephrolithotomyPatients are positioned in the lithotomy position and a 6 F ureteral catheter is placed and the bladder is drained with a 16F urethral Foley catheter. After ureteral catheterization, patients are placed in the prone position, and percutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 12-14 F fascial dilator was used to dilate the nephrostomy tract to pass the 13 F semi-rigid plastic sheath. Then, a 9.5-F, rigid ureteroscope (KARL STORZ Medical Instruments) was introduced to the sheath. The renal stones were broken into pieces using holmium laser lithotripsy. Finally, the ureteroscope and sheath were removed and the tract site was packed for 2-3 min. then placement of double J stent will be done according to the decision of the operating surgeon for 3 to 4 weeks. |
Who may qualify
- Ages
- 18 years and older
- Sex
- All
- Healthy volunteers
- Not accepted
- Age groups
- Adult, Older adult
Key inclusion criteria (1 listed)
- adult patient aged over 18 with renal stone between 1 and 2 cm
Key exclusion criteria (8 listed)
- patient with a single kidney.
- Renal stones larger than 2 cm or less than 1 cm.
- Patients with uncontrolled co-morbidities (hypertension, diabetes mellitus, cardiac disease, chest disease).
- Patients with active urinary tract infection.
- Patients with other anatomic renal abnormalities (congenital renal malformations such as horseshoe kidney, polycystic kidney disease, etc.). and Patients with severe skeletal deformity.
Eligibility is decided by the study team after screening; this overview does not establish that a patient qualifies. Full inclusion and exclusion criteria.
Interventions
| Intervention | Type | Arms |
|---|---|---|
| percutaneous nephrolithotomypercutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 30F. | Procedure or surgery | percutaneous nephrolithotomy |
| ultra-mini percutaneous nephrolithotomypercutaneous access of the desired calyx is achieved under fluoroscopic guidance with the use of an 18-gauge needle and a guidewire passage. Tract dilation is accomplished by using Amplatz dilators up to 12-14 F fascial dilator was used to dilate the nephrostomy tract to pass the 13 F semi-rigid plastic sheath. | Procedure or surgery | ultra-mini percutaneous nephrolithotomy |
Primary outcome
stone free rate of patients with renal stones by non contrast CT scan
Time frame: first day postoperative
efficacy of the procedure to clear renal stones completely in single session, non contrast CT will evaluate the stone burden and compare it to the preoperative measurement
5 secondary outcomes
operative time of both procedures
Time frame: intraoperative finding
hospital stay of the patient
Time frame: 1 to 3 days postoperative
hemoglobin drop of the patients
Time frame: first day postoperative
postoperative urine leakage from the surgical wound
Time frame: first day postoperative
cost analysis of both procedure
Time frame: 3 days postoperative
Results and safety
Results are not available in the source record.
Research links
- Official record on ClinicalTrials.govLast updated by the sponsor 21 Feb 2021.
- Individual participant dataSharing planned: Undecided. To compare the difference between the two procedures regarding stone-free rates, operative time, hospital stay, procedures cost, and operative complications including blood loss, the need for blood transfusion, and extravasation or urine leakage.
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Referral and contact
AzTrials does not enrol participants or take referrals. Contact the study team or a site listed below; they decide who can take part. This study is not recruiting at the moment.
1 site in 1 country: see every site and its status.
Questions about this trial
What is this clinical trial studying?
A Phase 3 study testing percutaneous nephrolithotomy and ultra-mini percutaneous nephrolithotomy in people with Stone, Kidney, run by Ain Shams University at 1 site in Egypt.
The full registered description is in the About this study section and the official record.
Who may be eligible to take part?
The sponsor lists 1 inclusion and 8 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.
Is this clinical trial currently recruiting?
The record says: status not confirmed, as of the sponsor's last update on 21 Feb 2021. Status can change between updates, so confirm with the study contact before making plans.
Where is the study taking place?
The record lists 1 site in Egypt. Whether a site is taking part right now should be confirmed with that site. See every site.
What are the possible benefits and risks?
They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.
What does this phase mean?
Phase 3 studies compare the treatment with the current standard treatment or a placebo in a large group, to confirm how well it works and watch for side effects.
Not every study follows the same path, and some studies (observational studies, device studies) have no phase.
Are results available for this study?
Results are not available in the source record.
How can a doctor refer a patient or contact the research team?
Contact Ashraf Satour, Master degree of Urology (01000396284 ext. +2, ahsrafsatour@yahoo.com), or a site near the patient. AzTrials does not enrol participants or take referrals.
What does the primary outcome measure?
stone free rate of patients with renal stones by non contrast CT scan (time frame: first day postoperative). It is what the study was designed to measure, not a finding.
Where can I read the original study information?
Does a listing mean the treatment is approved or proven to work?
No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.
How often is this information updated?
AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 21 Feb 2021; AzTrials last refreshed its copy on 7 Nov 2026.