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Quality of Life Outcomes and Economic Impacts of Bariatric Surgery

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 evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT00850356
Recruitment Status : Completed
First Posted : February 25, 2009
Last Update Posted : May 21, 2013
Canadian Institutes of Health Research (CIHR)
Information provided by (Responsible Party):
Raj Padwal, University of Alberta

Brief Summary:
The purpose is to determine the economic, clinical and quality of life outcomes of bariatric surgery and describe the consequences of protracted wait-times (~ 2 years) for this procedure.

Condition or disease

Detailed Description:

Severe obesity affects approximately 3% of Canadians (nearly 1 million people) and is becoming increasingly common and costly. Surgery for severe obesity, known as bariatric surgery, substantially reduces weight and the risk of death, decreases obesity-related health problems and increases quality of life. However, surgery carries a 0.5-2% up-front risk of death, has potentially serious short and long-term complications, and an uncertain cost-to-benefit ratio. Surgery is becoming increasingly popular, programs are being initiated or expanded across the country, and waiting lists are several years long. Provincial governments, unable to keep pace with surgical demand, are sending patients to the US for surgery and patients are petitioning governments for increased access to care.

By collecting data from a clinical obesity program that services an entire Canadian health region of over 1 million people and linking these data to provincial and regional data sources, this study aims to:

  1. Determine whether surgery improves 2-yr medical and patient-centered outcomes (such as quality of life, satisfaction, and others) compared to both medical and community wait-list control patients;
  2. Comprehensively compare the 3-yr costs of surgical and non-surgical care;
  3. Determine the impact of 2-yr wait times for surgery on patient health and wellness, including quality of life and patient satisfaction.

This study will provide essential data to accurately determine the benefits, risks, and costs of bariatric surgery in the Canadian context for patients, care providers, and decision makers. Equally important, it will determine whether the health and quality of life of Canadians waiting for surgery is adversely affected because of extended wait-times. Results will directly influence and streamline patient care, will be applicable to similar programs across the country, and serve as an important foundation for future research and data collection.

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Study Type : Observational
Actual Enrollment : 500 participants
Time Perspective: Prospective
Official Title: Alberta Population-based, Prospective Evaluation of the Quality of Life Outcomes and Economic Impacts of Bariatric Surgery
Study Start Date : November 2008
Actual Primary Completion Date : August 2012
Actual Study Completion Date : August 2012

Resource links provided by the National Library of Medicine

Bariatric Surgery Patient (Sx)
Participants who are patients in an Adult Weight Management Clinic (AWMC) and undergo bariatric surgery.
Medical Treamtent (Mx)
Participants who are patients in the same AWMC as above and are currently undergoing a medical treatment program that includes intensive lifestyle counseling (diets, exercise, behavioral modification).
Wait-List (Wx)
Participants who are on the Wait-List for the AWMC, and waiting to undergo medical treatment program and/or bariatric surgery.

Primary Outcome Measures :
  1. Quality of life measured through responses to standardized health questionnaires: SF-12; EQ-5D; IWQoL(Impact of Weight on Quality of Life); PSS(Patient satisfaction survey); Mod WLIQ:(Modified Waiting-list impact questionnaire) [ Time Frame: Every Six months for 2 years (At time =0, 6, 12, 18, 24 months) ]

Secondary Outcome Measures :
  1. Comprehensive comparison of the 3-yr costs of surgical and non-surgical care through medication logs, a questionnaire package, and accessing Alberta health and Wellness data. [ Time Frame: Every six months for 2 years (At time =0, 6, 12, 18, 24 months) ]

Information from the National Library of Medicine

Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the contacts provided below. For general information, Learn About Clinical Studies.

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Ages Eligible for Study:   18 Years to 60 Years   (Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No
Sampling Method:   Non-Probability Sample
Study Population

Three participant goups (n=500:)

Bariatric Surgery(Sx):150 participants. Patients approved for bariatric surgery in an Adult Weight Management Clinic (AWMC) will be eligible (BMI ≥35 kg/m2 and a major medical comorbidity or BMI ≥ 40 kg/m2). Contraindications to surgery are pregnancy, unstable psychiatric disease, patients deemed too medically high-risk, age > 60 years, active substance abuse, or an active eating disorder.

Medical Treatment(Mx):200 participants. Patients will be approached for the study upon their first visit in the AWMC.

Both medical and surgical patients receive intensive lifestyle counseling (diets, exercise, behavioral modification) delivered according to current recommendations. Other than receiving extra education about surgery and post-operative diets, there is no difference in care between the medical and surgical arms.

Community Wait-List Control(Wx):150 participants will be enrolled from the list of newly referred patients to the AWMC.


Inclusion Criteria:

  1. 18-60 years old
  2. Male and Female
  3. BMI Levels greater than or equal to 35 kg/m2 and a major medical comorbidity OR BMI levels greater than or equal to 40 kg/m2
  4. Able to provide written informed consent

Exclusion Criteria:

  1. Pregnant or nursing
  2. Previously enrolled in this study (e.g Community Control Arm)
  3. Currently participating in a clinical trial
  4. Individual expected to have difficulty with follow-up visits, completion of questionnaires, etc.
  5. Any contraindications to bariatric surgery and/or anti-obesity medical treatment
  6. Ability and willingness to complete questionnaires.
  7. Any other medical, social or geographic condition, which, in the opinion of the investigator would not allow safe completion of the study protocol.
  8. Patients in whom protein sparing very low calorie diet therapy is planned.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT00850356

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Canada, Alberta
Royal Alexandra Hospital
Edmonton, Alberta, Canada, T5H 3V9
Sponsors and Collaborators
University of Alberta
Canadian Institutes of Health Research (CIHR)
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Principal Investigator: Raj Padwal, MD University of Alberta
Publications of Results:
Other Publications:
Publications automatically indexed to this study by Identifier (NCT Number):
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Responsible Party: Raj Padwal, Associate Professor, General Internal Medicine, University of Alberta Identifier: NCT00850356    
Other Study ID Numbers: #B-120208
First Posted: February 25, 2009    Key Record Dates
Last Update Posted: May 21, 2013
Last Verified: May 2013
Keywords provided by Raj Padwal, University of Alberta:
Bariatric Surgery
Body Weight
Health care costs
Obesity Complications
Prolonged wait times
Quality of Life
Additional relevant MeSH terms:
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Nutrition Disorders
Body Weight