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Critical Limb IschemiaPROMISENCT03970538

PROMISE II: Percutaneous Deep Vein Arterialization for the Treatment of Late-Stage Chronic Limb-Threatening Ischemia

A study testing LimFlow System in people with Critical Limb Ischemia and Critical Lower Limb Ischemia, run by LimFlow, Inc. at 21 sites in 2 countries.

Unknown status

Status not confirmed. The sponsor has not verified this record for over two years, so it may be out of date.

Official record
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Trial summary

The LimFlow System is intended for endovascular, minimally invasive procedures in patients who have a clinical diagnosis of chronic limb-threatening ischemia and who have been determined to have no surgical or endovascular treatment option (i.e., "no option"). Read more about this study

Who is it for?
Ages 18 to 95 years
What is being tested?
LimFlow System
Type of treatment
Medical device
Could I receive a placebo?
No, everyone receives an active treatment
How many people
105 participants
Where
21 sitesin 2 countries
Study dates
6 Dec 2019to 28 Feb 2025
Phase
Interventional
Are there results?
Yes, posted in the registrySummary in the doctors' view

Key requirements

Who can take part, as listed by the sponsor. Only the study team can confirm whether you are eligible, so take this list to your doctor.

  • Ages 18 to 95 years
  • All sexes
  • No healthy volunteers
  • Adult, Older adult

Who may be able to join

  • Subject must be ≥18 and ≤ 95 years of age
  • Clinical diagnosis of chronic limb-threatening ischemia, defined as any of the following clinical assessments: previous angiogram or hemodynamic evidence of severely diminished arterial inflow of the index limb (e.g., ABI ≤ 0.39, TP / TcPO2 < 30 mm Hg) and
  • Rutherford Classification 5, ischemic ulceration or
  • Rutherford Classification 6, ischemic gangrene
  • Subject has been assessed by the principal investigator, reviewed by the Independent Review Committee (IRC), and determined that no conventional distal bypass surgical or endovascular therapy for limb salvage is feasible due to either a) absence of a usable pedal artery target (endovascular or surgical approach), or b) the presence of a pedal artery target with absence of a viable single-segment vein in either lower extremity or either arm that could be used for autogenous vein conduit.
  • Proximally, the Target In-flow Artery at the cross-over point must fall within the recommended vessel diameter ranges for the LimFlow stent graft by visual estimation.
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  • Prior stent(s) to the infrainguinal arteries (e.g. iliac, SFA, and popliteal) are allowed.
  • Planned minor amputation (e.g. partial toe, ray or proximal foot/transmetatarsal) of target extremity within 30 days after the index procedure is allowed.
  • Subject is willing and able to sign the informed consent form.
  • Subject is enrolled in an acceptable wound care network and has an adequate support network to ensure that subject is compliant with medication regimen and follow-up study visits.
  • Prior to enrollment (7-day window), women of childbearing potential must have a negative pregnancy test.
  • Primary wound is stable (e.g. not rapidly deteriorating and/or showing signs of healing)
  • Stable glycemic control, HbA1C < 10% (<269mg/dL)
  • Subjects requiring dialysis may be included, provided they meet all the following requirements:
  • On dialysis for > 6 months
  • Autologous arteriovenous (AV) fistula or peritoneal access used for hemodialysis
  • Serum albumin > 30 g/liter
  • BMI > 20

Who cannot join

  • Subjects will be excluded from participating in this study if they meet any of the following criteria prior to initiation of the endovascular procedure: Concomitant hepatic insufficiency, thrombophlebitis in the target limb, or non-treatable coagulation disorder within the past 90 days.
  • Active immunodeficiency disorder or currently receiving immunosuppressant therapy for an immunodeficiency disorder.
  • Prior peripheral arterial bypass procedure above or below the knee which would inhibit proximal inflow to the stent graft or interventional revascularization procedure within 30 days.
  • Previous major amputation of the target limb or presence of a wound requiring a free flap or absence of adequate viable tissue.
  • Life expectancy less than 12 months.
  • Documented myocardial infarction or stroke within previous 90 days.
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  • Active infection (e.g. fever, significantly elevated WBC count >20.0 x 109/L, and/or positive blood culture) at the time of the index procedure that may preclude insertion of a prosthesis or require major amputation (e.g. osteomyelitis proximal to metatarsals).
  • Known or suspected allergies or contraindications to aspirin or P2Y12 inhibitors, heparin, stainless steel, nitinol or contrast agent that cannot be adequately pre-treated.
  • Subject is currently taking anti-coagulants, which in the opinion of the investigator, interferes with the subject's ability to participate in the study (i.e., intermittent interruption of therapy for procedure may compromise subject's safety).
  • Lower extremity vascular disease that may inhibit the procedure and/or jeopardize wound healing (e.g. vasculitis, Buerger's disease, significant edema in the target limb, deep venous thrombus in the target vein, hyperpigmentation, or medial ulceration above the ankle).
  • Significant acute or chronic kidney disease with a serum creatinine of > 2.5 mg/dl in subjects not undergoing dialysis.
  • Severe heart failure (e.g. NYHA Class IV), which in the opinion of the investigator may compromise subject's ability to safely undergo a percutaneous procedure.
  • Any significant concurrent medical, psychological, or social condition, which may significantly interfere with the subject's optimal participation in the study, in the opinion of the investigator.
  • The subject is currently participating in another investigational drug or device study that has not completed the primary endpoint or that clinically interferes with the endpoints of this study.
  • 15) Subject is unwilling, or unable, or unlikely for cognitive or social reasons to comply with any of the protocol or follow-up requirements.

Trial locations and contacts

21 sites in 2 countries.

21 sites in 2 countries

United States20 sites
  • New Mexico Heart Institute

    Albuquerque, New Mexico, 87102

  • Seton Heart

    Austin, Texas, 78723

  • Massachusetts General Hospital

    Boston, Massachusetts, 02114

  • Boston Medical Center

    Boston, Massachusetts, 02118

  • Atrium Health

    Charlotte, North Carolina, 28203

  • University Hospitals Cleveland Medical Center

    Cleveland, Ohio, 44106

  • Prisma Health -- Midlands

    Columbia, South Carolina, 29203

  • Unitypoint Health

    Des Moines, Iowa, 50309

  • The Cardiac and Vascular Institute

    Gainesville, Florida, 32605

  • University of Florida

    Gainesville, Florida, 32608

  • Prisma Health -- Upstate

    Greenville, South Carolina, 29615

  • Baylor College of Medicine

    Houston, Texas, 77030

  • Ochsner Health System

    Kenner, Louisiana, 70065

  • Dartmouth-Hitchcock Medical Center

    Lebanon, New Hampshire, 03766

  • Saint Luke's Hospital

    Lee's Summit, Missouri, 64086

  • Vanderbilt University Medical Center

    Nashville, Tennessee, 37232

  • Yale University

    New Haven, Connecticut, 06519

  • University of California San Francisco

    San Francisco, California, 94143

  • Harbor-UCLA Medical Center

    Torrance, California, 90502

  • Coastal Carolina Surgical Associates

    Wilmington, North Carolina, 28401

Other trials in United States

Puerto Rico1 site
  • Ponce Medical School

    Ponce, 00731

Other trials in Puerto Rico

About this study

Official title: Percutaneous Deep Vein Arterialization for the Treatment of Late-Stage Chronic Limb-Threatening Ischemia: the PROMISE II Trial

The LimFlow System is intended for endovascular, minimally invasive procedures in patients who have a clinical diagnosis of chronic limb-threatening ischemia and who have been determined to have no surgical or endovascular treatment option (i.e., "no option").

Read the detailed description

The objective of this US pivotal trial is to investigate the safety and effectiveness of The LimFlow System for creating an AV connection in the Below The Knee (BTK) vascular system using an endovascular, minimally invasive approach to arterialize the pedal veins for the treatment of chronic limb-threatening ischemia (CLTI) in subjects ineligible for conventional endovascular or surgical limb salvage procedures.

Being tested
LimFlow System
Keywords
CLI, CLTI, Amputation, Desert Foot, PAD, Peripheral Artery Disease, Critical Limb Ischemia, Chronic Limb-Threatening Ischemia, TADV - Transcatheter Arterialization of Deep Veins, DVA - Deep Vein Arterialization
Medical subject headings
Chronic Limb-Threatening Ischemia, Peripheral Arterial Disease, Arterial Occlusive Diseases, Peripheral Vascular Diseases, Vascular Diseases

What participants receive

What participants receive. In a randomised study each person is assigned to one group by chance.

  • LimFlow SystemDevice

    Creation of an AV fistula in below-the-knee vasculature for the treatment of critical limb ischemia

Study groups in NCT03970538
Study groupRoleWhat they receive
Treatment ArmExperimentalTreated with the LimFlow System
Receives: Device: LimFlow System

What is being measured

The primary outcome is the main question the study is designed to answer.

  1. Amputation Free Survival (AFS)

    freedom from major amputation and death at 6 months, compared to a historical performance goal.

    Measured: 6 months post-procedure

Secondary outcomes (32)
  1. Primary Patency

    Absence of occlusion of the endovascular intervention that is maintained without the need for additional or secondary surgical or endovascular procedures.

    Measured: 30 days post procedure

  2. Primary Assisted Patency

    Absence of occlusion of the endovascular intervention maintained with the use of additional or secondary surgical or endovascular procedures, as long as occlusion of the primary treated site has not occurred.

    Measured: 6 months post-procedure

  3. Secondary Patency

    Absence of occlusion of the endovascular intervention that is maintained with the use of additional or secondary surgical endovascular procedures after occlusion occurs.

    Measured: 30 days post-procedure

  4. Limb Salvage

    The percentage of subjects with freedom from above-ankle amputation of the index limb.

    Measured: 30 days post-procedure

  5. Change in Rutherford Classification

    A decrease in Rutherford class number (i.e.: from Rutherford class 5 to 4) is clinical improvement

    Measured: 30 days post-procedure

  6. Technical Success

    The successful creation of an arteriovenous fistula in the desired limb location with immediate morphological success.

    Measured: Immediately post-procedure

  7. Procedure Success

    Combination of Technical Success, and absence of all-cause death, above-ankle amputation or clinically driven major re-intervention of the stent graft.

    Measured: 30 days post-procedure

  8. Target Wound Healing

    Complete healing of the patient's target wound

    Measured: 30 days post-procedure

  9. All Wound Healing

    Complete healing of the patient's wounds.

    Measured: 30 days post-procedure

  10. Freedom From Contrast-Induced Nephropathy

    Subjects without acute (within 72 hours after intravenous contrast administration) impairment of renal function, measured as an absolute ≥0.5 mg/dL (44 µmol/L) increase compared to baseline SCr value that results in a value above the upper limit of the normal range.

    Measured: Within the first 72 hours post-procedure

  11. Procedure Time

    Time from the first puncture (venous or arterial) to when the last catheter is removed

    Measured: Immediately post-procedure

  12. Radiation Exposure

    Patient radiation exposure (measured in milligray)

    Measured: During the procedure

  13. Contrast Volume

    Total volume of contrast media (measured in milliliters)

    Measured: During the procedure

  14. All Wound Area Reduction

    Defined as reduction in area of the patient's wounds

    Measured: 30 days post-procedure

  15. Primary Patency

    Absence of occlusion of the endovascular intervention that is maintained without the need for additional or secondary surgical or endovascular procedures.

    Measured: 6 months post procedure

  16. Secondary Patency

    Absence of occlusion of the endovascular intervention that is maintained with the use of additional or secondary surgical endovascular procedures after occlusion occurs.

    Measured: 6 months post-procedure

  17. Limb Salvage

    The percentage of subjects with freedom from above-ankle amputation of the index limb.

    Measured: 3 months days post-procedure

  18. Limb Salvage

    The percentage of subjects with freedom from above-ankle amputation of the index limb.

    Measured: 6 months days post-procedure

  19. Change in Rutherford Classification

    A change of one Rutherford class or greater.

    Measured: 3 months post-procedure

  20. Change in Rutherford Classification

    A change of one Rutherford class or greater.

    Measured: 6 months post-procedure

  21. Target Wound Healing

    Complete healing of the patient's target wound

    Measured: 3 months post-procedure

  22. Target Wound Healing

    Complete healing of the patient's target wound

    Measured: 6 months post-procedure

  23. Target Wound Healing

    Complete healing of the patient's target wound

    Measured: 9 months post-procedure

  24. Target Wound Healing

    Complete healing of the patient's target wound

    Measured: 12 months post-procedure

  25. All Wound Area Reduction

    Defined as reduction in area of the patient's wounds

    Measured: 3 months post-procedure

  26. All Wound Area Reduction

    Defined as reduction in area of the patient's wounds

    Measured: 6 months post-procedure

  27. All Wound Area Reduction

    Defined as reduction in area of the patient's wounds

    Measured: 9 months post-procedure

  28. All Wound Area Reduction

    Defined as reduction in area of the patient's wounds

    Measured: 12 months post-procedure

  29. All Wound Healing

    Complete healing of the patient's wounds.

    Measured: 3 months post-procedure

  30. All Wound Healing

    Complete healing of the patient's wounds.

    Measured: 6 months post-procedure

  31. All Wound Healing

    Complete healing of the patient's wounds.

    Measured: 9 months post-procedure

  32. All Wound Healing

    Complete healing of the patient's wounds.

    Measured: 12 months post-procedure

Timeline

From the start of the study to its completion; the mark is today. Estimated dates are the sponsor’s plan.

  1. First posted31 May 2019
  2. Study start6 Dec 2019
  3. Primary completion9 Sep 2022
  4. Study completion28 Feb 2025 (estimated)

Resources

More details

For doctors and researchers: how the study is designed, who runs it, and its registry IDs.

Study design
Study type
Interventional
Phase
Phase N/A
Primary purpose
Treatment
Allocation
Not applicable
Intervention model
Single group
Model description
Prospective, multi-center pivotal study
Masking
None (open label)
Enrolment
105 participants (actual)
IDs, dates and publications
ClinicalTrials.gov ID
NCT03970538
Sponsor's protocol ID
LF-CA-PR-3
Acronym
PROMISE
Status last verified
Jan 2024
First submitted
29 May 2019
Last updated
28 Feb 2024
Data monitoring committee
Yes
FDA-regulated drug
No
FDA-regulated device
Yes
Individual data sharing
No

Publications

  • Shishehbor MH, Powell RJ, Montero-Baker MF, Dua A, Martinez-Trabal JL, Bunte MC, Lee AC, Mugglin AS, Mills JL, Farber A, Clair DG; PROMISE II Investigators. Transcatheter Arterialization of Deep Veins in Chronic Limb-Threatening Ischemia. N Engl J Med. 2023 Mar 30;388(13):1171-1180. doi: 10.1056/NEJMoa2212754.

    PubMed 36988592

Questions about this trial

What is this clinical trial studying?

A study testing LimFlow System in people with Critical Limb Ischemia and Critical Lower Limb Ischemia, run by LimFlow, Inc. at 21 sites in 2 countries.

The full registered description is in the About this study section and the official record.

Who may be eligible to take part?

The sponsor lists 18 inclusion and 15 exclusion criteria. Eligibility is decided by the study team after screening, so read the full criteria and contact a listed site.

Is this clinical trial currently recruiting?

The record says: status not confirmed, as of the sponsor's last update on 28 Feb 2024. Status can change between updates, so confirm with the study contact before making plans.

Where is the study taking place?

The record lists 21 sites in United States, Puerto Rico. Whether a site is taking part right now should be confirmed with that site. See every site.

What are the possible benefits and risks?

They depend on the study and the treatment, and no study can promise a benefit. The study team explains the known risks during informed consent, before anyone joins; the record itself does not list them.

Are results available for this study?

Yes. Results are posted in the registry (first posted 28 Feb 2024). A summary is in the For doctors view, and the full results are on ClinicalTrials.gov.

How can a doctor refer a patient or contact the research team?

The record lists no contact. The official record names the sponsor, who can be asked directly. AzTrials does not enrol participants or take referrals.

What does the primary outcome measure?

Amputation Free Survival (AFS) (time frame: 6 months post-procedure). It is what the study was designed to measure, not a finding.

Where can I read the original study information?

On the ClinicalTrials.gov record for NCT03970538, which also lists 1 linked publication.

Does a listing mean the treatment is approved or proven to work?

No. A listing means the study is registered. It does not show that the treatment is safe, works, or is approved by a regulator.

How often is this information updated?

AzTrials copies changed records from ClinicalTrials.gov every night and reloads the whole registry every week. The sponsor last updated this record on 28 Feb 2024; AzTrials last refreshed its copy on 26 Oct 2026.

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