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Absence of Residual Vein Thrombosis Permits to Withdrawn Oral Anticoagulants (Exten-DACUS)

This study has been completed.
Information provided by:
Azienda Ospedaliera Universitaria Policlinico Identifier:
First received: February 19, 2008
Last updated: March 24, 2008
Last verified: March 2008

Background. The optimal duration of oral anticoagulant treatment in patients with idiopathic Deep Vein Thrombosis (DVT)of the lower limbs is still uncertain. Residual Vein Thrombosis (RVT) has been found able to establish the patient' risk for recurrent thrombotic events. In the present study we conducted a RVT-based therapeutic strategy, withholding OAT after 3 months in patients without RVT while continuing anticoagulants for at least additional 9 months in those in whom RVT persists.

Methods Patients with a first episode of symptomatic unprovoked proximal Vein Thrombosis (VT) were given Oral Anticoagulant Treatment (OAT) for 3 months. Residual Vein Thrombosis (RVT), ultrasonographically-detected, will be then assessed. Patients without RVT did not continue OAT (Group B), whereas those with RVT will continue OAT for at least additional 9 months. Patients were followed-up prospectively focusing on the study outcomes: occurrence of recurrent venous thromboembolism and major bleeding over a period of at least 12 months after OAT discontinuation.

Condition Intervention Phase
Deep Vein Thrombosis Drug: warfarin accordingly INR value Phase 4

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)
Primary Purpose: Treatment
Official Title: Absence of Residual Vein Thrombosis After an Episode of Unprovoked Deep Vein Thrombosis: Short-Term Anticoagulation is Safe.

Resource links provided by NLM:

Further study details as provided by Azienda Ospedaliera Universitaria Policlinico:

Primary Outcome Measures:
  • Recurrent Venous Thromboembolism [ Time Frame: for the entire study ]

Secondary Outcome Measures:
  • major and minor haemorrhage, death [ Time Frame: for the entire study ]

Enrollment: 500
Study Start Date: June 1999
Study Completion Date: January 2008
Primary Completion Date: June 2006 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Active Comparator: A
warfarin treatment
Drug: warfarin accordingly INR value
warfarin accordingly to INR value between 2.0-3.0
Other Name: warfarin
No Intervention: B
withholding warfarin therapy

  Show Detailed Description


Ages Eligible for Study:   18 Years and older   (Adult, Senior)
Sexes Eligible for Study:   All
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • First episode of unprovoked proximal DVT of the lower limbs and treated for 3 month with oral anticoagulants

Exclusion Criteria:

  • Active cancer,
  • Limited life expectancy,
  • Antiphospholipid antibody syndrome, or an other known thrombophilic status (such as antithrombin deficiency),
  • Serious liver disease,
  • Pregnancy
  • Conditions requiring anticoagulation (atrial fibrillation, etc)
  Contacts and Locations
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Please refer to this study by its identifier: NCT00623987

Sergio Siragusa
Palermo, Italy, 90127
Sponsors and Collaborators
Azienda Ospedaliera Universitaria Policlinico
Study Chair: Sergio Siragusa, MD University Hospital of Palermo
  More Information

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Sergio Siragusa, University of Palermo Identifier: NCT00623987     History of Changes
Other Study ID Numbers: 0036/99
Study First Received: February 19, 2008
Last Updated: March 24, 2008

Keywords provided by Azienda Ospedaliera Universitaria Policlinico:
Residual vein thrombosis
Optimal duration
Oral anticoagulants

Additional relevant MeSH terms:
Venous Thrombosis
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases
Anticoagulants processed this record on August 21, 2017