ESWL for Distal Ureteric Stone: Supine Versus Prone

Urinary Calculi Clinical Trial

Official title:

Randomized Controlled Study on Extracorporeal Shockwave Lithotripsy for Distal Ureteric Stone: Transgluteal Versus Traditional Prone Approach

Clinical Trial Details — Status: Recruiting

Administrative data

• NCT number: NCT02298465
• Other study ID #: QueenMaryH
• Status: Recruiting
• Phase: N/A
• Start date: November 2014
• Est. completion date: November 2027

Study information

• Verified date: August 2023
• Source: Queen Mary Hospital, Hong Kong
• Contact: Brian Ho, MBBS
• Phone: (852)2255-3023
• Email: brianshho[@]gmail.com
• Is FDA regulated: No
• Study type: Interventional

Clinical Trial Summary

Extracorporeal shockwave lithotripsy (ESWL) for urinary stone is common and widespread nowadays. Approximately 80% of urinary stones are treated by ESWL. Traditionally distal ureteric stones are treated with ESWL in the prone position. However, as some patients cannot tolerate lying in the prone due to medical illness such as chronic obstructive pulmonary disease (COPD), some authors have reported using the supine approach of ESWL for treatment of distal ureter stones. No serious complications had developed in the patients who underwent supine approach. Only minor complications such as self-limiting blood in the urine, painful passage of urine, or local pain that had responded to oral painkillers. There were no serious complications encountered in children as well. In the most recent retrospective review by Tolley et al, they had revealed that patients who had underwent supine ESWL for distal ureteric stones had an improved stone-free rate compared with the traditional prone approach.

Patient with radio-opaque distal ureteric stones (stones below the sacroiliac joint) on KUB X-ray, who have opted for ESWL treatment, are randomized into two groups: one undergoing ESWL in the supine position and the other undergoing ESWL in the prone position. Patients will be observed for two hours after ESWL before being discharged. Oral painkillers as necessary will be provided to the patient. The patients will have a KUB Xray at 2 weeks post-ESWL, and then monthly afterwards if required. If there are residual stones at the 2-week follow-up, the patient will be offered ESWL again. Patients are free to withdraw from the study at any time and will continue to be managed as per usual.

The investigators aim to have 130 patients, with 65 patients in each group with an interim analyses to be performed when 66 patients have been recruited (33 patients in each group).

Description:

Previous authors have reported using the greater and lesser sciatic foramina as a pathway for the shockwaves to reach the distal ureter. No serious complications had developed in the patients who underwent transgluteal approach. Only minor complications such as self-limiting hematuria, dysuria, or pain that had responded to oral analgesics. There were no serious complications encountered in children as well. In the most recent retrospective review by Tolley et al, they had revealed that patients who had underwent transgluteal ESWL for distal ureteric stones had an improved stone-free rate of 78% in the transgluteal group versus 40% in the prone group after one session of shockwave lithotripsy and a stone-free rate of 92% versus 63% respectively after two sessions of shockwave lithotripsy. This has been speculated to be due to the presence of bowel gas attenuating the shockwaves as well as a long skin-to-stone distance in the prone position.

Recruitment information / eligibility

• Status: Recruiting
• Enrollment: 130
• Est. completion date: November 2027
• Est. primary completion date: November 2025
• Accepts healthy volunteers: No
• Gender: All
• Age group: 18 Years and older

Eligibility

Inclusion Criteria:

• All patients, over 18 years of age, with distal ureteric stones with stone size of =3mm on kidney-ureter-bladder (KUB) X-ray who opted for ESWL treatment

Exclusion Criteria:

• Patients who are unable to provide consent

• radiolucent stones

• active urinary tract infections

• pregnancy

• uncontrolled hypertension

• uncontrolled bleeding tendencies

• severe skeletal malformations

• arterial aneurysms within the vicinity of the stone (such as iliac artery aneurysms)

• unable to assume the appropriate position (prone or supine) for ESWL

• solitary kidneys

• transplanted kidneys

• presence of ureteric stents

Related Conditions & MeSH terms

• Calculi
• Ureteral Calculi
• Ureterolithiasis
• Urinary Calculi
• Urinary Stones
• Urinary Tract Stones
• Urolithiasis

Intervention

Procedure:
• Supine ESWL
ESWL to distal ureteric stone is performed in the supine position with the shockwave generator placed in the patient's buttock area. The aim is to direct the shockwaves through the greater and lesser sciatic foramina to reach the distal ureter.
• Prone ESWL
ESWL to the distal ureteric stone is performed in the traditional prone position. The shockwave generator is placed on the patient's abdomen

Device:
• Extracorporeal Shockwave Lithotripsy (ESWL)
The ESWL machine we use is the Dornier S2 lithotriptor. ESWL is performed without any sedation or anesthesia under fluoroscopy. Painkillers are given upon request.

Locations

Country	Name	City	State
China	Queen Mary Hospital	Hong Kong

Sponsors (1)

Lead Sponsor	Collaborator
Queen Mary Hospital, Hong Kong

Country where clinical trial is conducted

China, 

References & Publications (5)

Jenkins AD, Gillenwater JY. Extracorporeal shock wave lithotripsy in the prone position: treatment of stones in the distal ureter or anomalous kidney. J Urol. 1988 May;139(5):911-5. doi: 10.1016/s0022-5347(17)42713-3. — View Citation

Lu J, Sun X, He L. Sciaticum majus foramen and sciaticum minus foramen as the path of SWL in the supine position to treat distal ureteral stone. Urol Res. 2010 Dec;38(6):417-20. doi: 10.1007/s00240-010-0285-2. Epub 2010 Jul 13. — View Citation

Phipps S, Stephenson C, Tolley D. Extracorporeal shockwave lithotripsy to distal ureteric stones: the transgluteal approach significantly increases stone-free rates. BJU Int. 2013 Jul;112(2):E129-33. doi: 10.1111/j.1464-410X.2012.11738.x. Epub 2013 Jan 29. — View Citation

Sun X, He L, Lu J, Cong X, Shen L, Wang Y, Zhu H. Greater and lesser ischiadic foramina as path of shock wave lithotripsy for distal ureteral stone in children. J Urol. 2010 Aug;184(2):665-8. doi: 10.1016/j.juro.2010.03.060. Epub 2010 Jun 19. — View Citation

Zehntner CH, Marth D, Zingg EJ. ESWL treatment with ventral shock-wave application: therapy of iliac and distal ureteral calculi. Urology. 1991 Jul;38(1):51-3. doi: 10.1016/0090-4295(91)80013-w. — View Citation

Outcome

Type	Measure	Description	Time frame	Safety issue
Primary	Stone-free rate	To review KUB to determine if distal ureteric stone have been passed	2 weeks. If stone still present, then 6 weeks and 10 weeks.
Secondary	Complications rates concerning the two approaches of ESWL	To see if any complications arise from the procedures	2 weeks. If stone still present, then 6 weeks and 10 weeks.
Secondary	Pain associated with the procedure for the two approaches of ESWL	Using visual analogue scale to determine the pain scores of each intervention on the day of intervention; Number of tablets of analgesics used in-between follow up	2 weeks. If stone still present, then 6 weeks and 10 weeks.