Trial Review

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The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been endorsed by the ANZCTR. Before participating in a study, talk to your health care provider and refer to this information for consumers
Trial registered on ANZCTR


Registration number
ACTRN12618000806268
Ethics application status
Approved
Date submitted
30/04/2018
Date registered
11/05/2018
Date last updated
24/03/2022
Date data sharing statement initially provided
12/04/2019
Date results provided
24/03/2022
Type of registration
Prospectively registered

Titles & IDs
Public title
Bile Reflux after Weight-Loss Surgery
Scientific title
Assessing bile reflux using endoscopy and HIDA scintigraphy in post-bariatric surgical patients
Secondary ID [1] 294750 0
None
Universal Trial Number (UTN)
U1111-1213-1261
Trial acronym
Linked study record

Health condition
Health condition(s) or problem(s) studied:
Bile reflux 307644 0
Obesity 307645 0
Condition category
Condition code
Surgery 306713 306713 0 0
Surgical techniques

Intervention/exposure
Study type
Observational
Patient registry
False
Target follow-up duration
Target follow-up type
Description of intervention(s) / exposure
Patients planned to undergo weight-loss surgery (gastric bypass or sleeve gastrectomy) will be invited to join the study. The type of weight loss operation performed by the surgeon will not be affected by enrolment in this study. Pre-operatively, participants will undergo upper gastro-intestinal endoscopy with stomach (+/- oesophageal) biopsies and biochemical analysis of stomach fluid, blood testing and biometric measurements (weight, height, BMI, hip and waist circumference). Participants will also be requested to complete a symptom questionnaire.

At 6 months post-operatively, participants will undergo a HIDA scan at Royal Adelaide Hospital and a repeat endoscopy with biopsies and gastric fluid samples. They will also be invited to complete again the same GERD-Q Questionnaire, in addition to an ‘Investigations Tolerability Questionnaire’. Repeat measurements of weight, height, BMI, hip and waist circumference will also be collected.
Intervention code [1] 301050 0
Diagnosis / Prognosis
Comparator / control treatment
No control group
Control group
Active

Outcomes
Primary outcome [1] 305712 0
To evaluate whether laparoscopic single anastomosis gastric bypass (LSAGB), laparoscopic Roux-en-Y gastric bypass (LRYGB) and laparoscopic sleeve gastrectomy (LSG) operations result in increased bile reflux 6 months post-operatively, as determined by visualisation of reflux on HIDA scanning, the presence of bile acids in the stomach and oesophagus, with or without histological stomach/oesophageal tissue damage.
Timepoint [1] 305712 0
Pre-operatively and 6 months post-operatively
Secondary outcome [1] 346222 0
To further evaluate the safety and efficacy of laparoscopic single-anastomosis gastric bypass, laparoscopic sleeve gastrectomy and laparoscopic roux-en-Y gastric bypass. as determined by complication rate, amount of weight loss and remission of obesity-related comorbidities. Complications include, but are not limited to, infection, anastomotic leak and post-operative ileus. Weight loss will be determined by change in actual weight and measurement of waist and hip circumference. Obesity related comorbidities include diabetes/ glucose intolerance and high cholesterol and will be evaluated by changes in blood results (blood glucose, HbA1c, LDL/HDL).
Timepoint [1] 346222 0
Complications will be evaulated during the participants' post-operative recovery in hospital. Weight, waist and hip circumference will be measured pre-operatively and 6-months post-operatively. Blood tests will be performed pre-operatively and 6-months post-operatively.
Secondary outcome [2] 346223 0
To evaluate the patient’s tolerability of investigations by surveying comfort during and after investigations, and perception of invasiveness and tolerability of investigations.
Timepoint [2] 346223 0
6 months post-operatively

Eligibility
Key inclusion criteria
Obesity of >5 years duration
BMI>40 or >35 plus comorbidities
Documented attempts at previous weight loss
Age 18-60
Good commitment to achieving weight loss
Suitability for bariatric surgery
Minimum age
18 Years
Maximum age
60 Years
Sex
Both males and females
Can healthy volunteers participate?
No
Key exclusion criteria
Previously undergone obesity surgery
Previously undergone gastric surgery
Previously undergone gallbladder surgery
Large abdominal hernias
Pregnancy or are breast feeding
Psychiatric illness
BMI>65

Study design
Purpose
Screening
Duration
Cross-sectional
Selection
Defined population
Timing
Prospective
Statistical methods / analysis
Sample Size:
Using the best estimates of bile reflux rates for the 3 operations found in the available literature, a power calculation was performed to determine the required sample size. Taking into consideration potential variance between surgeons and operative sites, as well as a drop-out rate of 10%, our sample size is 75 (25 in each arm).

Sample analysis:
Gastric biopsies will be reviewed by a qualified histopathologist within SA Pathology to assess: markers of tissue inflammation, markers of DNA damage and presence of bile acids.

Gastric aspirates will be analysed using established assays by SA Pathology to assess: presence of bile acids, concentration of bile acids and identification of individual bile acids.

HIDA Scan analysis:
The rate of hepatobiliary excretion of the tracer utilized and amount of bile reflux will be calculated from the HIDA scans using dynamic imaging with region of interest calculations over the liver, duodenum, gastric remnant and oesophagus.

Statistical Analysis of data:
Statistical analysis will be undertaken using commercially available statistical programs in consultation with professional statistical advice from our Unit's established connection with a health research statistician. Normally distributed data will be reported as mean ± standard error of the mean and statistical comparisons between groups will be made using parametric statistical tests. Data that is not normally distributed, will be analysed using non-parametric statistics with reporting of median (interquartile range) and comparisons by applying non-parametric statistical tests, with post-hoc analysis for differences across the 3 surgical groups. Proportionate data will be compared using tests such as a Fisher’s exact test or X2 test.

Recruitment
Recruitment status
Completed
Date of first participant enrolment
Anticipated
21/05/2018
Actual
9/07/2018
Date of last participant enrolment
Anticipated
29/05/2020
Actual
31/07/2020
Date of last data collection
Anticipated
27/11/2020
Actual
31/05/2021
Sample size
Target
75
Accrual to date
Final
81
Recruitment in Australia
Recruitment state(s)
SA
Recruitment hospital [1] 10819 0
The Queen Elizabeth Hospital - Woodville
Recruitment hospital [2] 10820 0
Calvary Wakefield Hospital - Adelaide
Recruitment hospital [3] 13619 0
The Burnside War Memorial Hospital - Toorak Gardens
Recruitment hospital [4] 13620 0
The Royal Adelaide Hospital - Adelaide
Recruitment hospital [5] 16130 0
Flinders Private Hospital - Bedford Park
Recruitment hospital [6] 16131 0
Ashford Community Hospital - Ashford
Recruitment postcode(s) [1] 22559 0
5011 - Woodville
Recruitment postcode(s) [2] 22560 0
5000 - Adelaide
Recruitment postcode(s) [3] 26287 0
5065 - Toorak Gardens
Recruitment postcode(s) [4] 29658 0
5042 - Bedford Park
Recruitment postcode(s) [5] 29659 0
5035 - Ashford

Funding & Sponsors
Funding source category [1] 299356 0
Hospital
Name [1] 299356 0
Oesophageal Function Laboratory
Country [1] 299356 0
Australia
Primary sponsor type
University
Name
Discipline of Surgery, University of Adelaide
Address
The Queen Elizabeth Hospital
28 Woodville Road
Woodville South, SA 5011
Country
Australia
Secondary sponsor category [1] 298631 0
Hospital
Name [1] 298631 0
Department of Nuclear Medicine
Address [1] 298631 0
Royal Adelaide Hospital Port Road Adelaide SA 5000
Country [1] 298631 0
Australia

Ethics approval
Ethics application status
Approved
Ethics committee name [1] 300261 0
Human Research Ethics Committee (TQEH/LMH/MH)
Ethics committee address [1] 300261 0
Ethics committee country [1] 300261 0
Australia
Date submitted for ethics approval [1] 300261 0
14/09/2017
Approval date [1] 300261 0
01/12/2017
Ethics approval number [1] 300261 0
HREC/17/TQEH/185
Ethics committee name [2] 300262 0
Calvary Health Care Adelaide (CHCA) Human Research Ethics Committee
Ethics committee address [2] 300262 0
Ethics committee country [2] 300262 0
Australia
Date submitted for ethics approval [2] 300262 0
11/12/2017
Approval date [2] 300262 0
23/03/2018
Ethics approval number [2] 300262 0
18-CHREC-F001

Summary
Brief summary
Trial website
Trial related presentations / publications
Public notes

Contacts
Principal investigator
Name 83082 0
Mr Jon Shenfine
Address 83082 0
Flinders Medical Centre Flinders Drive Bedford Park SA 5042
Country 83082 0
Australia
Phone 83082 0
+61 8 8204 5511
Fax 83082 0
Email 83082 0
[email protected]
Contact person for public queries
Name 83083 0
Thomas Eldredge
Address 83083 0
Department of Surgery The Queen Elizabeth Hospital 28 Woodville Road Woodville South SA 5011
Country 83083 0
Australia
Phone 83083 0
+61439769900
Fax 83083 0
Email 83083 0
[email protected]
Contact person for scientific queries
Name 83084 0
Thomas Eldredge
Address 83084 0
Department of Surgery The Queen Elizabeth Hospital 28 Woodville Road Woodville South SA 5011
Country 83084 0
Australia
Phone 83084 0
+61439769900
Fax 83084 0
Email 83084 0
[email protected]

Data sharing statement
Will the study consider sharing individual participant data?
No
No IPD sharing reason/comment: No necessary



What supporting documents are/will be available?

Doc. No.TypeCitationLinkEmailOther DetailsAttachment
7370Study protocol    Study-related document.pdf
7371Informed consent form    Study-related document.pdf



Results publications and other study-related documents

Documents added manually
No documents have been uploaded by study researchers.

Documents added automatically
No additional documents have been identified.