The Effects of Omega-3 Fatty Acids on Peripheral Arterial Disease II (OMEGA-PAD II)

July 18, 2019 updated by: University of California, San Francisco

The Effects of Omega-3 Fatty Acids Supplementation on Endothelial Function and Inflammation II

Investigators hypothesize that high-dose n-3 polyunsaturated fatty acids (PUFA) oral supplementation will improve systemic inflammation, vascular function, and symptomatic status of patients with PAD. Investigators will explore novel mechanistic pathways by which n-3 PUFA affect PAD, evaluating the role of specialized lipid mediators involved in the resolution of inflammation.

Study Overview

Status

Completed

Conditions

Intervention / Treatment

Detailed Description

The OMEGA-PAD II trial will be a 1:1 randomized, double-blinded trial comparing oral supplementation of n-3 PUFA (4.4g/day) to placebo in claudicants (Rutherford stage 1-3) for 3 months. Eligible patients will be screened according to specified inclusion and exclusion criteria. All patients will be treated per our current practice as reflected in the American Heart Association Practice guidelines on PAD. Blood draws, vascular function testing and 6-minute walking tests will be performed at baseline and after 3 months. n-3 PUFA supplementation will be achieved with 4 capsules of Pro-Omega twice daily (Nordic Naturals, Watsonville, California, USA), corresponding to a total of 4.4g/day. Each ProOmega capsule contains 325mg of EPA and 225mg of DHA. The placebo group will take the same number of capsules containing inactive substance (soybean; Nordic Naturals), designed to be the same color and shape as the treatment capsules.

Study Type

Interventional

Enrollment (Actual)

26

Phase

  • Phase 2

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
    • California
      • San Francisco, California, United States, 94121
        • San Francisco Veterans Affairs Medical Center

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

50 years to 100 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Intermittent claudication (Rutherford 1-3)

  2. One of the following:

    1. Resting or exercise ankle-brachial index (ABI) <0.9
    2. toe pressure < 70 mm Hg
    3. documentation on imaging of greater than or equal to 50% stenosis in segments of aortoiliac arteries, femoral arteries, or tibial arteries
  3. Age 50 and more

Exclusion Criteria:

  1. Critical limb ischemia
  2. Hypersensitivity/allergies to fish or seafood
  3. Already on n-3 PUFA or equivalent
  4. Significant renal, hepatic, and inflammatory disease
  5. Concurrent severe infections
  6. Acute illness (myocardial infarction, stroke, major surgery within 30 days)
  7. Receiving immunosuppressive medications or steroids
  8. Age < 50

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: Treatment
  • Allocation: Randomized
  • Interventional Model: Parallel Assignment
  • Masking: Triple

Arms and Interventions

Participant Group / Arm
Intervention / Treatment
Experimental: Pro-Omega
High-dose, short-duration dietary omega-3 fatty acids supplementation; 325mg of EPA and 225mg of DHA per capsule. 4.4gm/day x 3 months (Nordic Naturals, Watsonville, CA, USA)
Dietary supplement: Pro-Omega
Pro-Omega (Nordic Naturals, Watsonville, CA, USA). Each ProOmega capsule contains 325mg of EPA and 225mg of DHA. 4.4gm/day x 3 months
Placebo Comparator: Placebo
Pro-Omega Placebo soybean capsules (Nordic Naturals, Watsonville, CA, USA); 4.4gm/day x 3 months
Other: ProOmega Placebo
Placebo Comparator: soybean (Nordic Naturals, Watsonville, CA, USA); 4.4gm/day x 3 months

What is the study measuring?

Primary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Systemic Inflammatory bio-markers
Time Frame: 3 months
reduce circulating pro-inflammatory markers (PIMs) and increase pro-resolution mediators (PRMs) assayed using targeted metabolo-lipidomics, increase PRM production within peripheral circulating monocytes.
3 months

Secondary Outcome Measures

Outcome Measure
Measure Description
Time Frame
Endothelial Function
Time Frame: 3 months
Will increase brachial artery flow-mediated vasodilation (FMD)and peripheral resistance (AiX) and decrease arterial stiffness in the lower extremities (PWV).
3 months

Other Outcome Measures

Outcome Measure
Measure Description
Time Frame
Walking Performance
Time Frame: 3 months
Will improve walking distance during 6-minute walk test and improve parameters on the walking impairment questionnaire (WIQ).
3 months

Collaborators and Investigators

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

Sponsor

University of California, San Francisco

Investigators

  • Principal Investigator: Warren Gasper, MD, UCSF & SFVAMC

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

Helpful Links

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

February 1, 2014

Primary Completion (Actual)

September 1, 2017

Study Completion (Actual)

September 1, 2017

Study Registration Dates

First Submitted

November 1, 2013

First Submitted That Met QC Criteria

November 1, 2013

First Posted (Estimate)

November 8, 2013

Study Record Updates

Last Update Posted (Actual)

July 22, 2019

Last Update Submitted That Met QC Criteria

July 18, 2019

Last Verified

July 1, 2019

More Information

Terms related to this study

Additional Relevant MeSH Terms

Other Study ID Numbers

  • 13-11778

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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