Dietary Restriction in Vascular Surgery (DRIVeS)

September 23, 2020 updated by: C. Keith Ozaki, M.D., F.A.C.S., Brigham and Women's Hospital
A randomized, controlled trial to evaluate patient compliance and biologic mechanisms of a short-term pre-operative Protein-Calorie Restriction (PCR) diet in comparison to a normal ad libitum diet for 4 days before elective vascular surgery involving a major operation. This study is a step in the long-term primary scientific objective to test the hypothesis that brief up regulation of endogenous H2S via pre-operative PCR in elective major surgery improves clinical outcomes in humans. After a successful pilot study of the PCR diet conducted inpatient before carotid endarterectomy, the investigators now aim to expand the study to at home diet among a variety of vascular surgery procedures.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

Hydrogen sulfide (H2S) has emerged as a critical gaseous signaling molecule with a role in multiple processes including ischemia-reperfusion (IR) injury, angiogenesis, intimal hyperplasia, and anti-inflammatory mechanisms. It even appears to hold anti-atherosclerotic properties. However, the gas is toxic with a half-life of minutes, and it can be rapidly oxidized. Furthermore, no clinically useful pharmacologic H2S donors have been developed to date. In a 2015 Cell paper, the study investigators link substantial upregulation of endogenous H2S to short-term manipulation of mammalian dietary intake: simple dietary restriction. The current project serves as the second phase in the accelerated translation of this important discovery toward clinical utility that may substantively impact the vascular patient at several levels: protection from IR injury, intimal hyperplasia, peri-procedural events such as stroke, cardiac dysfunction and myocardial infarction (MI), and promotion of angiogenesis.

Chronic protein and calorie dietary restriction (PCR; reduced food intake without malnutrition) is known for extending longevity in multiple species. PCR is also an established approach to positively impact metabolic fitness and resistance to multiple forms of acute stress. Despite these wide-ranging benefits, potential clinical applications have never been considered feasible in humans due to the practical difficulties associated with voluntary food restriction combined with the assumption that PCR benefits take a long time to accrue. Recent preclinical studies by the applicants reveal a rapid onset of PCR benefits against surgically induced traumatic inflammation, IR injury, and the fibroproliferative vascular response to injury in rodents. Mechanistically, rapid changes in adipose phenotype and associated adipokine profiles appear to underlie these benefits; but the key mediator appears to be endogenous H2S. This field thus stands poised to move to clinical utility, and vascular surgery offers an optimal risk/benefit ratio for translation of the PCR/H2S hypothesis.

For the current project the investigators will complete a randomized, controlled trial to evaluate patient compliance and biologic mechanisms of a short-term pre-operative PCR diet in comparison to a normal ad libitum diet for 4 days before elective major vascular surgery. Both Endpoints relate to the long-term primary scientific objective to test the hypothesis that brief upregulation of endogenous H2S via pre-operative PCR in elective major surgery improves clinical outcomes in humans. After a successful pilot study of the PCR diet conducted inpatient before carotid endarterectomy titled Short-Term Endogenous Hydrogen Sulfide Upregulation (NCT03303534), the investigators now aim to expand the study to at home diet among a variety of vascular surgery procedures.

Eighty subjects undergoing carotid artery endarterectomy, aortic aneurysm repair (open, and endovascular if groin cut down planned), open lower extremity arterial procedures (bypasses, aneurysm repair, arterial and bypass graft reconstructions), major amputation of the lower extremity (below knee and above knee amputations), or open hemodialysis access procedures for either symptomatic or asymptomatic disease will be recruited and enrolled at Brigham and Women's Hospital. Using a randomized (3:2), parallel design, patients will receive either the PCR diet (n=48; ScandiShake [any of 4 flavors] mixed with almond milk, calculated individually for a total daily volume to achieve 30% caloric restriction and 70% protein restriction, based on body weight and activity level), or continued routine ad libitum diet (n=32). Daily physical activity will be assessed by questionnaire to determine the activity factor for accurate calorie restriction calculations. Water intake is ad libitum for both cohorts, and both diets can be consumed throughout the day and night (except on the day of surgery). Patients will consume their assigned diets for the four days leading up to surgery until midnight the day of surgery when both cohorts will be fasted for the procedure (per standard clinical guidelines).

Study Type

Interventional

Enrollment (Actual)

19

Phase

  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • United States
    • Massachusetts
      • Boston, Massachusetts, United States, 02115
        • Brigham and Women's Hospital

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Ages Eligible for Study

18 years and older (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria

• Patients greater than 18 years old who present for one of the following elective procedures at Brigham and Women's Hospital

  • Carotid artery endarterectomy
  • Aortic/iliac aneurysm repair (open, and endovascular if groin cut down planned)
  • Open lower extremity arterial procedures (bypasses, aneurysm repair, arterial and bypass graft reconstructions)
  • Major amputation of the lower extremity (below knee and above knee amputations).
  • Open hemodialysis access procedures

Exclusion Criteria

  • Patient intolerance or allergy to any of the ingredients in the PCR diet
  • Active infection
  • Pregnancy
  • Malnutrition, based on abnormally low serum albumin (lower than 3 g/dL)
  • Uncontrolled diabetes (HgbA1c greater than 12%)
  • Substance dependency that could interfere with protocol adherence and assent as determined by the PI
  • Active non-cutaneous cancer under treatment with chemotherapeutics or radiation
  • Emergency surgery
  • Active participation in any another interventional or randomized study
  • Participation in the current study within the past 30 days

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Prevention
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Protein-Calorie Restriction
Four day dietary intervention immediately before surgery of ScandiShake [any of 4 flavors] mixed with almond milk, calculated individually for a total daily volume to achieve 30% caloric restriction and 70% protein restriction, based on body weight and activity level.
Dietary supplement: Protein-Calorie Restriction
Four day dietary intervention immediately before surgery of ScandiShake [any of 4 flavors] mixed with almond milk, calculated individually for a total daily volume to achieve 30% caloric restriction and 70% protein restriction, based on body weight and activity level.
No Intervention: Control
Ad libitum diet for four days immediately before surgery

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Outpatient compliance with protein calorie restriction
Time Frame: 1 Month
Patient compliance with the PCR diet will be assessed by food record analysis.
1 Month
Comparison of H2S and related biological markers of stress
Time Frame: 1 Month
Biologic markers include: adipose phenotyping (quantification of adipokines, adipose derived hormones), leukocyte phenotyping and quantification via flow cytometry, and serum assays of IL-1beta, IL-6, IL-8, HGF, leptin, MCP-1, PAI-1, resistin, NGF, TNF, adiponectin, hydrogen sulfide (including production capacity) assays, insulin, lipid panels, FGF 21, pre-albumin, epinephrine, norepinephrine, dopamine, CBC with differential, basic metabolic panel including calcium. H2S and biologic markers will be compared at baseline, immediately before surgery, and the day after surgery.
1 Month

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Brigham and Women's Hospital

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start (Actual)

December 31, 2018

Primary Completion (Actual)

March 31, 2020

Study Completion (Actual)

March 31, 2020

Study Registration Dates

First Submitted

June 24, 2019

First Submitted That Met QC Criteria

July 8, 2019

First Posted (Actual)

July 9, 2019

Study Record Updates

Last Update Posted (Actual)

September 25, 2020

Last Update Submitted That Met QC Criteria

September 23, 2020

Last Verified

September 1, 2020

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 2018P002133

Plan for Individual participant data (IPD)

Plan to Share Individual Participant Data (IPD)?

NO

Drug and device information, study documents

Studies a U.S. FDA-regulated drug product

No

Studies a U.S. FDA-regulated device product

No

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

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