Reduced Calorie Diet Intervention in Kidney Transplant Recipients

NCT ID: NCT00994838

Last Updated: 2015-07-17

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE2
• Total Enrollment: 27 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2009-10-31
• Study Completion Date: 2014-01-31

Brief Summary

The purpose of this study is to measure the effect of a reduced calorie diet intervention in new kidney transplant recipients on the outcomes weight gain, oxidative stress, and insulin resistance.

Detailed Description

Kidney transplantation is the preferred renal replacement therapy for end stage renal disease (ESRD) because it affords survival and quality of life advantages over maintenance dialysis.1 The number of transplants performed increases each year, with currently over 150,000 individuals living in the United States with a kidney transplant. This is in the setting of 68,000 patients on the wait list with a median wait time of 4 years for an available organ.2 Despite the survival benefit over dialysis, transplanted patients still have a greatly increased risk of cardiovascular disease (CVD) over the general population, and CVD is the leading cause of death among recipients with a functioning graft.3 Given the long wait times for kidneys due to organ shortage, extensive resources used, and support needed for each transplant procedure, it is imperative that we improve long term patient and graft survival. Accordingly, modification of CVD risk profile is of paramount importance in kidney transplant patients.

The etiology of increased risk of CVD in kidney transplant patients is multi-factorial and includes the high burden of CVD and its risk factors present prior to transplant, as well as increasing prevalence of these risk factors in the post transplant period due to transplant associated weight gain, immunosuppression side effects, metabolic consequences of a functioning kidney, and allograft dysfunction. Efforts to reduce CVD risk factors have yet to be adequately implemented and rigorously studied in the kidney transplant population.

Obesity at the time of transplant is common and associated with several CVD risk factors post transplant, including hypertension, hyperlipidemia, diabetes mellitus, metabolic syndrome, and inflammation. Obesity is also associated with potentially poorer graft outcomes, including death censored graft loss and chronic allograft failure.4 In addition, the majority of patients gain weight post transplantation, primarily in the form of fat mass. Post transplant weight gain is also associated with increased prevalence of known CVD risk factors, CVD death, and graft loss.5 The increased burden of CVD in kidney transplant patients makes obesity prevention and treatment strategies appealing interventions to improve long-term outcomes, both in terms of graft and overall survival. In this study we will measure the effect of a low calorie diet intervention in new kidney transplant recipients on the outcomes weight gain, oxidative stress, and insulin resistance.

Conditions

Chronic Kidney Disease

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

reduced calorie diet

10% reduction in total daily calories (≈ 300 kcal reduction) from carbohydrates and fat from the usual daily energy consumption

Group Type: ACTIVE_COMPARATOR

reduced calorie diet

Intervention Type: OTHER

10% reduction in total daily calories (≈ 300 kcal reduction) from carbohydrates and fat from the usual daily energy consumption

standard diet

Group Type: NO_INTERVENTION

No interventions assigned to this group

Interventions

reduced calorie diet

10% reduction in total daily calories (≈ 300 kcal reduction) from carbohydrates and fat from the usual daily energy consumption

Intervention Type: OTHER

Eligibility Criteria

Inclusion Criteria

• Age 18 years to 65 years;
• BMI 25 to 40 kg/m2;
• First time kidney transplant;
• Single organ transplant;
• Ability to understand and voluntarily provide informed consent.

Exclusion Criteria

• Type 1 DM;
• Type 2 DM on diabetic medications/insulin;
• Biopsy proven acute rejection in the first 3 months post transplant;
• Active coronary disease;
• Immunosuppressive therapy at time of transplant (use prior to what is given for transplant procedure);
• Atrial fibrillation (only for those undergoing the optional Pulse Wave Velocity);
• Hypersensitivity to organic nitrates, isosorbide, or nitroglycerin (only for those undergoing the optional brachial artery Doppler).

• Minimum Eligible Age: 18 Years
• Maximum Eligible Age: 65 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

Vanderbilt University

OTHER

Sponsor Role: lead

Responsible Party

Kelly Birdwell

Assistant Professor

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Kelly A Birdwell, MD

Role: PRINCIPAL_INVESTIGATOR

Vanderbilt University Medical Center

Locations

Vanderbilt University Medical Center

Nashville, Tennessee, United States

Countries

United States

Other Identifiers

091030

Identifier Type: -

Identifier Source: org_study_id