Effect of Limb Length Ratio on Roux-en-Y Gastric Bypass Outcomes (CLIMB II Study)

NCT ID: NCT06293703

Last Updated: 2025-05-07

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: NA
• Total Enrollment: 262 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2024-01-12
• Study Completion Date: 2030-12-11

Brief Summary

The investigators propose a randomized controlled trial comparing BP and roux limb lengths measuring 30 and 15% respectively of patient's total small bowel length versus current standard practice using fixed lengths. The findings would provide further insight into feasibility of standardizing RYGB limb lengths and optimizing resultant weight loss and metabolic effects. The investigators hypothesize RYGB with ratio-adjusted limb lengths (aRYGB) will result in higher total weight loss and resolution of metabolic syndrome comorbidities, including diabetes, hyperlipidemia, and hypertension compared to standard fixed-length RYGB (sRYGB). The study will also utilize the Short Form Rand 36-Item Health Survey (SF36) to determine differences in postoperative quality of life metrics.

Detailed Description

This study will be a prospective, randomized controlled trial with a 1:1 recruitment allocation ratio. Patients will be randomized to Standard fixed-length RYGB (sRYGB) or ratio-adjusted limb lengths (aRYGB) once the total small bowel length (TSBL) is fully counted intraoperatively.

sRYGB will serve as the control group which will utilize BP and roux limb lengths of 100cm and 100cm, respectively. For the treatment group, aRYGB will incorporate a BP limb length measuring 30% and a roux limb of 15% of total small bowel length each.

Outcomes to be investigated:

Specific Aim 1: To determine significantly increased Total Weight Loss (TWL) after aRYGB compared to sRYGB in morbidly obese patients Given current understanding that weight loss after RYGB is mediated, at least in part, by a malabsorptive process, the investigators hypothesize that TWL will be greater after aRYGB versus sRYGB. As per standard of care at our institute, routine postoperative follow-up in the multidisciplinary Bariatric clinic will occur every 6 months (± 14 days) or more frequently as clinically indicated for the first two years postoperatively followed by yearly thereafter. Weight will be recorded in kilograms and a BMI will be calculated by the ratio of patient weight in kilograms over patient height in meters squared. Postoperative TWL will then be measured postoperatively at 6, 12, 24, 60 months from surgery.

Specific Aim 2: To compare rates of Diabetes Mellitus (DM) resolution between aRYGB Vs SRYGB by DM subgroup analysis Of the many metabolic changes that occur after bariatric surgery, one of the most salient effects include a rapid and effective resolution of DM. This has been extensively studied in context of various bariatric surgeries, including RYGB by our institution as previously described by the STAMPEDE trial. Significant reduction of HbA1C and improvement in insulin sensitivity was noted as early as six to 12 months postoperatively. As such, this study proposes measurement of the following two metrics at 6, 12, 24, 60 months postoperatively: 1) proportion of subjects achieving HbA1C less than or equal to 6.5%; and, 2) proportion of subjects able to wean and/or discontinue glycemic control medications.

Specific Aim 3: To investigate the relative postoperative efficacy of aRYGB compared to sRYGB on alleviating metabolic syndrome in morbid obesity Metabolic syndrome is a constellation of diagnoses including Hypertension (HTN) and Hyperlipidemia (HLD), which posit significant risk of medical comorbidities such as DM, coronary disease, and strokes. As such, addressing these conditions in morbidly obese patients confers a significant health benefit and decreases overall morbidity. This secondary outcome will be measured by comparing pre- versus postoperative serum lipid levels and proportion of patients requiring less antihypertensives 6, 12, 24, 60 months postoperatively.

Specific Aim 4: To investigate the presence of postoperative vitamin and nutritional deficiencies between the groups.

These secondary outcomes will be addressed comparing the vitamin levels between the groups at 6, 12, 24, 60 months postoperatively.

Additional outcomes proposed include evaluation of postoperative quality of life as captured by the Impact of Weight on Quality of Life-Lite-Clinical Trials (IWQOL-Lite-CT) survey as validated and effectively used in previous investigative bariatric studies. Responses will be tracked and obtained preoperatively and at various postoperative time points including Post-Operative Day (POD) 30 (± 15 days) and POD 365 (± 90 days). The investigators will furthermore track postoperative complications and adverse events, as measured by the Comprehensive Complications Index in addition to instances where additional bariatric surgical interventions are pursued.

Conditions

Morbid Obesity

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: SINGLE

Study Groups

aRYGB

BP and roux limb lengths measuring 30% and 15% respectively of patient's total small bowel length.

Group Type: EXPERIMENTAL

Surgery

Intervention Type: PROCEDURE

Biliopancreatic limb and roux limb lengths measuring 30 and 15% respectively of patient's total small bowel length in RYGB

sRYGB

Standard fixed-length RYGB

Group Type: ACTIVE_COMPARATOR

Surgery

Intervention Type: PROCEDURE

Biliopancreatic limb and roux limb lengths measuring 30 and 15% respectively of patient's total small bowel length in RYGB

Interventions

Surgery

Biliopancreatic limb and roux limb lengths measuring 30 and 15% respectively of patient's total small bowel length in RYGB

Intervention Type: PROCEDURE

Eligibility Criteria

Inclusion Criteria

• morbidly obese patients (defined by BMI between 40 and 60).
• Patient who understands and accepts the need for a long-term follow-up.
• Patient who agrees to be included in the study

Exclusion Criteria

• individuals unable to understand and sign a written consent form
• patients with history of previous bariatric surgery procedures
• presence of a severe and evolutive life threatening pathology unrelated to obesity
• previous gastric or small bowel resection
• active cancer
• pregnancy or desired to be pregnant during the study
• mentally unbalanced patients under supervision or guardianship, patient unable to give consent

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 70 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Salvador Navarrete

OTHER

Sponsor Role: lead

Responsible Party

Salvador Navarrete

Principal Investigator

Responsibility Role: SPONSOR_INVESTIGATOR

Principal Investigators

Salvador Navarrete, MD

Role: PRINCIPAL_INVESTIGATOR

The Cleveland Clinic

Locations

Cleveland clinic

Cleveland, Ohio, United States

Site Status: RECRUITING

Countries

United States

Central Contacts

Salvador Navarrete, MD

Role: CONTACT

navarrs@ccf.org

2162199211

Andrew Strong, MD

Role: CONTACT

stronga3@ccf.org

2162183869

Facility Contacts

Salvador Navarrete, MD

Role: primary

navarrs@ccf.org

216-219-9211

Other Identifiers

23-1228

Identifier Type: -

Identifier Source: org_study_id