Polytetrafluoroethylen (PTFE) Vascular Prostheses With Heparin Bonded Luminal Surfaces vs Crude ePTFE (REPLACE)

  • End date
    Jan 30, 2023
  • participants needed
  • sponsor
    Nantes University Hospital
Updated on 13 February 2022


Open repair could be recommended in a first line of treatment to revascularize critical limb ischemia patients or performed in a second line of treatment in case of failure of endovascular repair. A good quality vein is one of the main factors that influence the clinical success of open revascularization for below-knee popliteal. In the absence of an suitable autologous vein, prosthesis such as polytetrafluoroethylen (PTFE) graft could be an option but demonstrated worse clinical and morphological results compared to autologous greater saphenous vein. Consequently, there is still a room for improvement in CLI patients in the absence of an suitable autologous vein in whom endovascular repair failed.

Recently, PTFE with heparin-bound to the luminal surface (Hb-PTFE) significantly reduced the overall risk of primary graft failure by 37%, in particular, risk reduction was 50% in femoropopliteal bypass cases in cases with critical ischemia (58% Primary patency for crude ePTFE versus 80% primary patency for PROPATEN at 1 year follow-up) (Lindholt, et. al. 2011).

Additionally, a weighted average from the literature suggests a 76% primary patency for below knee bypasses performed with PROPATEN at one year follow-up, whereas a published meta-analysis suggests a 59% primary patency for below knee crude ePTFE at one year follow-up. At two year follow-up using the same approach, the average primary patency for PROPATEN was 67% versus 43% for standard ePTFE.

The aim of this study is to assess PTFE with heparin-bound to the luminal surface as an alternative to crude PTFE in absence of good venous conduit in patients with CLI.


Patient inclusion in this study will be proposed 60 to 1-days period preceding the surgical procedure. The patient will be randomized in the crude PTFE or in the Propaten groups. Regarding the intervention, the technique used during the therapeutic procedure shall be left to the operator's discretion, except the type of the graft. Demographic, intraoperative and postoperative data will be collected prospectively. Patient will be assessed and followed up according a current care. The cost difference between both groups will be identified.

Condition Ischemia Lesions
Treatment Revascularization, Propaten®, Crude PTFE
Clinical Study IdentifierNCT03430076
SponsorNantes University Hospital
Last Modified on13 February 2022


Yes No Not Sure

Inclusion Criteria

Patient 18 years
Patient presented critical limb ischemia (Rutherford classification: 4-6)
Indication of below the knee bypass with an artificial graft
Absence of an suitable autologous vein
Patient is affiliated to the Social Security or equivalent system
Patient has been informed of the nature of the study, agrees to its provisions and has signed the informed consent form prior to any study related procedure
Patient agrees to undergo all protocol required follow-up examinations and requirements at the investigational site

Exclusion Criteria

No atheromatous disease
Female of child bearing potential
Patient has a history of coagulopathy or will refuse blood transfusions
Patient is receiving or scheduled to receive anticancer therapy for malignancy within 1 year prior to or after the procedure
Severe concomitant disease with life expectation < one year
Known allergy to heparin
Indication for ipsilateral major amputation
Patient is not able to give informed consent
Patient is currently participating in an investigational drug or device study that has not completed the primary endpoint or that clinically interferes with the current study endpoints Note: Trials requiring extended follow-up for products that were investigational, but have become commercially suitable since then, are not considered investigational trials
In the Investigator's opinion patient has (a) co-morbid condition(s) that could limit the patient's ability to participate in the study, compliance with follow-up requirements or impact the scientific integrity of the study
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