The Effect of Different Body Positions and Channel Sheaths on RIRS
- Conditions
- Urolithiasis
- Interventions
- Procedure: RIRS with f-UAS, lateral positionProcedure: RIRS with f-UAS, lithotomy positionProcedure: RIRS with traditional UAS, lateral positionProcedure: RIRS with traditional UAS, lithotomy position
- Registration Number
- NCT06438497
- Lead Sponsor
- The First Affiliated Hospital of Guangzhou Medical University
- Brief Summary
Retrograde flexible ureteroscopy (RIRS) is currently the first-line treatment for renal stones \< 2cm. Lower pole renal stones(LPS) are a difficult problem for urologists. The flexible negative pressure suction ureteral sheath(f-UAS) can facilitate RIRS to flush out the fragments and dust in time, and provide a clear vision and reduce the renal pelvis pressure(RPP) during operation.Standard lithotomy position is the most commonly used position for RIRS. Besides, T-tilt position is also available for RIRS in special cases. Investigators were inspired by this and proposed the lateral position, which is available in cases of LPS.In long-term practice, investigators have found that the change of position and the use of f-UAS can improve stone-free rate(SFR). Investigators aimed to conduct a prospective randomized controlled trial to compare the SFR of different positions and different ureteral sheaths.
- Detailed Description
Urolithiasis was one of the most frequently noted diseases in urology clinic, with an incidence ranged from 5 to 15% around the world. Retrograde flexible ureteroscopy (RIRS) is currently the first-line treatment for renal stones \< 2cm in size. Lower pole renal stones(LPS) are a difficult problem for urologists. The inborn sharp infundibular-pelvic angle (IPA) designated an inferior stone-free rate(SFR) of 65-82.5% in LPS when compared to middle and/or upper pole stone. The flexible negative pressure suction ureteral sheath(f-URS) can facilitate RIRS to flush out the fragments and dust in time, and provide a clear vision and reduce the renal pelvis pressure(RPP) during operation. Therefore, in cases of LPS, f-URS combined with RIRS may show advantages. However, there is currently a lack of relevant prospective randomized controlled studies. Standard lithotomy position is the most commonly used position for RIRS. Besides the standard lithotomy position, other positions, such as the T-tilt position, are also available for RIRS in special cases. Investigators were inspired by this and proposed the lateral position, which is available for RIRS in cases of LPS.Theoretically, in standard lithotomy position, the renal pelvis and renal calyces were mostly distributed in a '-\<' shaped structure on the horizontal plane. However, the renal pelvis and renal calyxes would be stood up in a 'Y'-shaped structure when patients laid in lateral position. And gravity will make the calyceal stones at the dome fall into the renal pelvis naturally during the lithotripsy. In long-term clinical practice, researchers have found that the change of position and the use of f-UAS can improve SFR. The investigators aimed to conduct a prospective randomized controlled trial to compare the SFR of different positions and different ureteral sheaths.
Recruitment & Eligibility
- Status
- RECRUITING
- Sex
- All
- Target Recruitment
- 90
- LPS with a diameter of 10-20 mm
- American Society of Anesthesiologists(ASA) score Ⅰ,Ⅱ and Ⅲ
- Adult patients
- Ureteric stricture
- Urethral deformity
- Renal malformation, including horseshoe kidney, ectopic kidney and transplanted kidney
- Pregnancy
- Multiple stones in diferent calyces, including upper pole and middle pole
Study & Design
- Study Type
- INTERVENTIONAL
- Study Design
- PARALLEL
- Arm && Interventions
Group Intervention Description RIRS with f-UAS, lateral position RIRS with f-UAS, lateral position In group 1, patients were placed on operating table in lateral position. A flexible negative-pressure suction ureteric access sheath (f-UAS) is placed under the pelvi-ureteral junction (PUJ) in RIRS. RIRS with f-UAS, lithotomy position RIRS with f-UAS, lithotomy position In group 2, patients were placed on operating table in lithotomy position. A flexible negative-pressure suction ureteral access sheath (f-UAS) is placed under the pelvi-ureteric junction (PUJ) in RIRS. RIRS with traditional UAS, lateral position RIRS with traditional UAS, lateral position In group 3, patients were placed on operating table in lateral position. A traditional ureteric access sheath (UAS) is placed under the pelvi-ureteral junction (PUJ) in RIRS. RIRS with traditional UAS, lithotomy position RIRS with traditional UAS, lithotomy position In group 4, patients were placed on operating table in lithotomy position. A traditional ureteral access sheath (UAS) is placed under the pelvi-ureteric junction (PUJ) in RIRS.
- Primary Outcome Measures
Name Time Method Stone-free rate 1 month A low-dose and ultrathin 2-mm spiral CT was performed at 1 month postoperatively for evaluation of fnal SFR. Stone-free status was defined as no fragments observed or clinically insignifcant residual fragments (CIRF)\<2 mm.
- Secondary Outcome Measures
Name Time Method Hemoglobin drop 1 day after surgery Change of hemoglobin level 1 day after surgery comparing to pre-operative value, g/L
Operative time During surgery Surgery duration, minutes
Complication rate 1 month after sugery Complication is defined as any adverse event occurred intraoperatively or ≤1 month postoperatively, including intraoperative bleeding, postoperative pain and so on.The investigator will invaluate perioperative complications by modified Clavien system
Hospital stay 1 week Duration of hospital stay after surgery, days
Trial Locations
- Locations (1)
Department of Urology, Minimally Invasive Surgery Center, The First Affiliated Hospital of Guangzhou Medical University
🇨🇳Guangzhou, Guangdong, China