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Efficacy of Low Molecular Weight Heparin in Superficial Vein Thrombosis (REVETR)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Read our disclaimer for details. Identifier: NCT01245998
Recruitment Status : Completed
First Posted : November 23, 2010
Last Update Posted : May 4, 2018
Information provided by (Responsible Party):
Pavel POREDOS, University Medical Centre Ljubljana

Brief Summary:
The aim of the study is to establish whether treatment of superficial vein thrombosis (SVT) with low-molecular-weight heparin in preventive or therapeutic doses prevents disease progression and thromboembolic events (deep vein thrombosis and pulmonary embolism), whether efficacy of low-molecular-weight heparin differs with regard to the dosage used (prevention, treatment), and to recognize groups of patients in which treatment with heparin is most efficient, as well as to determine factors that influence the efficacy of SVT treatment with heparin.

Condition or disease Intervention/treatment Phase
Superficial Thrombophlebitis Drug: Dalteparin Phase 4

Detailed Description:

Until recently thrombophlebitis was regarded as a benign and self-limiting disease. Recent studies have shown that various complications, especially vein thrombosis and pulmonary thromboembolism, often accompany SVT. An observational study (Prospective Observational Superficial Thrombophlebitis - POST) showed that three months after onset of the disease thromboembolic events occurred in 10% of patients: pulmonary embolism in 0.4%, disease progression in 3.1% and disease recurrence in 1.9% of patients. Therefore, SVT is now frequently regarded as a part of the thromboembolic syndrome. On the basis of the evidence referred to above anticoagulants, especially heparin, are used more and more often for treatment of SVT instead of anti-inflammatory drugs and non-steroidal antirheumatics. Several studies performed so far have examined the efficacy of standard and low-molecular-weight heparin in various doses, but no final conclusion on the efficacy of treatment of SVT with heparin has been established yet.

A study by Marchiori and colleagues showed that 8-12-day treatment of SVT with preventive and therapeutic doses of low-molecular-weight heparin significantly reduces progression and relapse of the disease, but not its thromboembolic complications. Another study demonstrated that low-molecular-weight heparin in combination with elastic compression was not significantly more effective than compression alone. Comparison of preventive and therapeutic doses of low-molecular-weight heparin given to patients over the period of one month after disease onset showed no differences in the efficacy in prevention of disease progression and thromboembolic complications. The standard (unfractionated) heparin was also shown to be effective in preventing disease progression, however, but not in preventing thromboembolic complications. It is also not clear how long the treatment with heparin should last. So far only one study compared the efficacy of treatment with various doses of low-molecular-weight heparin from one month to three months' duration; it demonstrated that 1-month treatment with lower doses of heparin was as effective as 3-month treatment with therapeutic doses of heparin. A recent study (CALISTO) compared the efficacy of preventive doses of fondaparinux (2.5 mg) with placebo in more than 3,000 patients with SVT and concluded that anticoagulant treatment of SVT probably does not significantly influence prevention of thromboembolic complications (Abstract presented at the 5th Annual Meeting of the American Society of Hematology).

Results of recent studies show that heparin (standard or low-molecular-weight heparin) in various doses prevents SVT progression, but no final agreement has emerged as to whether they prevent the occurrence of thromboembolic complications. Interpretation of the results is difficult because of the heterogeneity of the patients included in certain studies and especially because of unavailability of subgroup analyses, which would help to establish whether treatment with heparin is more effective in certain groups of patients with SVT than in those with presenting forms of the disease. Latest (2008) guidelines for prevention of venous thromboembolic events adopted by the American College of Chest Physicians (ACCP) recommend treatment with at least preventive or median doses of low-molecular-weight heparin or standard heparin for the duration of not less than 4 weeks. This recommendation was based on a very low evidence level (level 2B).

In this study, we aim to investigate whether the extensiveness of thrombophlebitis and the proximal distance of the end of a blood clot from saphenofemoral and saphenopopliteal junction influence the efficacy of SVT treatment with heparin. The investigators shall also monitor the expression of systemic inflammatory parameters that might be related to the efficacy of the treatment and progression of the disease.

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Study Type : Interventional  (Clinical Trial)
Actual Enrollment : 68 participants
Allocation: Randomized
Intervention Model: Parallel Assignment
Masking: Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: Prospective, Randomized, Double-blinded Trial of the Efficacy and Safety of Different Doses and Duration of Low Molecular Weight Heparin (Dalteparin) in Superficial Vein Thrombosis
Actual Study Start Date : December 1, 2010
Actual Primary Completion Date : December 3, 2012
Actual Study Completion Date : January 1, 2014

Resource links provided by the National Library of Medicine

Drug Information available for: Heparin

Arm Intervention/treatment
Active Comparator: dalteparin 5000 I.U./24 h s.c. Drug: Dalteparin
dalteparin 5000 I.U./24 h s.c. for 6 weeks
Other Name: Fragmin

Active Comparator: dalteparin 15000 I.U./24 h s.c. Drug: Dalteparin
dalteparin 15000 I.U./24 h s.c. for 6 weeks
Other Name: Fragmin

Primary Outcome Measures :
  1. To assess the efficacy and safety of low-molecular-weight heparin - dalteparin in patients with ST [ Time Frame: 3 months ]
    To compare the efficacy of therapeutic vs. preventive doses of dalteparin in prevention of thromboembolic complications and disease progression in patients with acute thrombophlebitis of lower extremities

  2. Combined end-point: occurrence of symptomatic or asymptomatic deep vein thrombosis, symptomatic pulmonary embolism or ultrasonographic blood clot progression or relapse of ST [ Time Frame: 3 months ]
  3. Clinically relevant bleeding occurring [ Time Frame: during treatment ]
    (i.e., major or clinically relevant non-major bleeding)

Secondary Outcome Measures :
  1. To investigate the safety of ST treatment with preventive doses of dalteparin compared with therapeutic doses, death, bleeding, heparin-induced thrombocytopenia (HIT) [ Time Frame: 3 months ]
  2. To ascertain whether the extent or progression of ST is related to systemic inflammatory parameters [ Time Frame: 12 months ]
  3. To study a possible correlation between effectiveness of treatment of ST with preventive and therapeutic doses of dalteparin and severity of systemic inflammatory parameters. [ Time Frame: 12 months ]
  4. To determine whether the extension of anticoagulant treatment with the study drug for additional six weeks is more effective and safer [ Time Frame: 3 months ]

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Ages Eligible for Study:   18 Years to 85 Years   (Adult, Older Adult)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • written informed consent to participate in the study
  • symptomatic thrombophlebitis of the great saphenous vein measuring at least 10 cm or the small saphenous vein measuring at least 10 cm or a collateral of the great saphenous vein measuring at least 10 cm (within 7 days from the onset of the disease)
  • age 18 to 85 years
  • body weight 65 to 85 kg

Exclusion Criteria:

  • inability to objectively confirm the diagnosis
  • excessive or insufficient body weight (more than 85 kg or less than 60 kg)
  • history of previous thromboembolic complications (including previous thrombophlebitis, vein thrombosis and pulmonary embolism)
  • contraindications for anticoagulant treatment
  • active bleeding or high risk for bleeding contraindicating treatment with (LMWH)
  • diseases requiring anticoagulant treatment
  • proximal or distal deep vein thrombosis or pulmonary embolism (either symptomatic or incidentally found asymptomatic)
  • thrombophlebitis of the great saphenous vein at a distance of less than 5 cm from the saphenofemoral junction or thrombophlebitis of small saphenous vein at a distance of less than 3 cm from the saphenopopliteal junction
  • thrombophlebitis that might arise as a consequence of a previous intravenous access (infusion thrombophlebitis), sclerotherapy or surgical treatment of chronic vein insufficiency
  • pregnancy, known malignant disease or chemotherapy
  • immobility
  • advanced stage of kidney failure (GF < 30 mL/min/1.72 m2)
  • significant liver disease (e.g., acute hepatitis, chronic active hepatitis, cirrhosis) or alanine transaminase (ALT) >\= 2 times the upper limit of normal (ULN), or total bilirubin (TBL) x 1.5 times the ULN

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01245998

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University Medical Centre Ljubljana
Ljubljana, Slovenia, 1000
Sponsors and Collaborators
University Medical Centre Ljubljana
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Principal Investigator: Pavel Poredos, M.D., Ph.D. University Medical Centre Ljubljana, Department of Vascular Disease

Publications of Results:
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Responsible Party: Pavel POREDOS, professor tenure track, board certified in internal medicine, cardiology and vascular disease, head of the research department, University Medical Centre Ljubljana Identifier: NCT01245998     History of Changes
Other Study ID Numbers: REVETR2010
First Posted: November 23, 2010    Key Record Dates
Last Update Posted: May 4, 2018
Last Verified: May 2018
Keywords provided by Pavel POREDOS, University Medical Centre Ljubljana:
Venous thrombosis
Pulmonary embolism
Low-Molecular-Weight Heparin
Additional relevant MeSH terms:
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Venous Thrombosis
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases
Peripheral Vascular Diseases
Calcium heparin
Heparin, Low-Molecular-Weight
Fibrinolytic Agents
Fibrin Modulating Agents
Molecular Mechanisms of Pharmacological Action