Prolonged Anticoagulation After a First Episod of Idiopathic Proximal Deep Vein Thrombosis (PADIS TVP)

NCT ID: NCT00740493

Last Updated: 2017-01-12

Basic Information

• Recruitment Status: COMPLETED
• Clinical Phase: PHASE3
• Total Enrollment: 104 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2007-07-31
• Study Completion Date: 2017-01-31

Brief Summary

In a French multicenter double blind randomized controlled trial, the main objective is to demonstrate that, after 6 months of oral anticoagulation for a first episode of idiopathic proximal deep vein thrombosis, 18 months of warfarin therapy is associated with a lower cumulative risk of recurrent VTE and major bleeding in comparison with that on 18 months of placebo. The secondary objectives are: (1) to determine the risk of recurrent VTE after 6 months of warfarin therapy and the presence or the absence of residual lung scan perfusion defect and the persistence or not of elevated D-dimer test; and (2), to determine the impact of extended duration of anticoagulation on the risk of VTE after stopping anticoagulant therapy on a follow-up of 2 years.

Detailed Description

Rational: After 3 or 6 months of oral anticoagulation for an episode of acute venous thromboembolism (VTE), the risk of recurrent VTE is high (10 to 15% per year) in comparison with a low risk of recurrence if VTE was provoked by a major transient risk factor such as recent surgery (3% per year) independently of the initial presentation (deep vein thrombosis or pulmonary embolism). After a first episode of idiopathic VTE, 3 months of anticoagulation is associated with a very high risk of recurrence (27% per year); however, the benefit-risk of extended duration of anticoagulation (1 to 2 years) remains uncertain, mainly in relation with an increased risk of anticoagulant related bleeding. Therefore, the last ACCP conference group recommended 6 months of oral anticoagulant therapy after a first episode of idiopathic VTE. However, this recommendation is likely to be inadequate for at least two main reasons: (1) no studies compared 2 years to 6 months of anticoagulation after idiopathic VTE; and (2), if the frequency of recurrent VTE is similar after deep vein thrombosis and pulmonary embolism, however, the case fatality rate of recurrent VTE is higher after pulmonary embolism (12%) than after deep vein thrombosis (5%).

Objective : the main objective is to demonstrate that, after 6 months of oral anticoagulation for a first episode of idiopathic proximal deep vein thrombosis, 18 months of warfarin therapy is associated with a lower cumulative risk of recurrent VTE and major bleeding in comparison with that on 18 months of placebo. The secondary objectives are: (1) to determine the risk of recurrent VTE after 6 months of warfarin therapy and the presence or the absence of residual lung scan perfusion defect and the persistence or not of elevated D-dimer test; and (2), to determine the impact of extended duration of anticoagulation on the risk of VTE after stopping anticoagulant therapy on a follow-up of 2 years.

Method : French multicenter double blind randomized controlled trial. Inclusion and exclusion criteria and deep vein thrombosis diagnostic criteria have been defined. After completing 6 months of oral anticoagulation, a leg ultrasound and D-dimer testing are performed; the investigators and the patients will be unaware of the results of these tests. Then, patients are randomized to receive 18 months of warfarin therapy or 18 months of placebo (the dose of placebo will be adapted according to false computer generated INR). The investigators, the radiologists and the patients are blinded of the treatment allocation. The project has been accepted by national ethical committee and written consent will be obtained from all included patients.

Required number of patients: the expected cumulative frequency of recurrent VTE and major bleeding over 18 months is 4.5% while on warfarin therapy and 16% while on placebo. For a α risk of 5% (to falsely conclude to a true difference) and a β risk of 10% (to falsely conclude to an absence of difference), 178 patients per group should be included. As 5% of patients are expected to be loss, a total of 374 patients is required.

Feasibility: about 50 patients per year are hospitalized in our department of medicine in Brest for an acute episode of idiopathic deep vein thrombosis. Four additional centers will participate to the study and have a similar recruitment: HEGP (Pr Meyer, Dr Sanchez), CHU Antoine Béclère (Dr Parent, Pr Simmoneau), CHU Saint Etienne (Pr Mismetti, Pr Décousus), CHU Grenoble (Pr Pison, Pr Carpentier). The study will be coordinated by the Clinical Center of Investigation of Brest Hospital; "true" and "false" INR will be generated by the clinic of anticoagulant of "Ile de France" (Dr Cambus).

Clinical implications: the first consequence of the study is to demonstrate that 6 months of warfarin therapy is inadequate and should be continued for at least 18 additional months after a first episode of idiopathic proximal deep vein thrombosis. This study has also the potential to confirm or not the contribution of ultrasound of lower limb and D-dimer testing to appreciate the risk of recurrent VTE after stopping anticoagulant therapy. Lastly, the medical economical impact of such therapeutic management will be evaluated.

Conditions

Recurrent Venous Thromboembolism; Idiopathic Deep Vein Thrombosis

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: QUADRUPLE

Study Groups

1

18 months of active warfarin therapy

Group Type: ACTIVE_COMPARATOR

warfarin

Intervention Type: DRUG

18 months of warfarin therapy

2

18 months of placebo of warfarin

Group Type: PLACEBO_COMPARATOR

placebo of warfarin

Intervention Type: DRUG

18 months of placebo of warfarin therapy

Interventions

warfarin

18 months of warfarin therapy

Intervention Type: DRUG

placebo of warfarin

18 months of placebo of warfarin therapy

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

• Patients with a first episode of idiopathic proximal deep vein thrombosis who have been treated during 6 months (Plus or minus 15 days) using Vitamin K antagonist with a INR between 2 and 3.

Exclusion Criteria

• Age > 18
• warfarin hypersensibility
• unwilling or unable to give writting informed consent
• distal deep vein thrombosis or pulmonary embolism
• Proximal deep vein thrombosis which was provoked by a reversible major risk factor
• major thrombophilia (protein C, S or antithrombin deficiency, antiphospholipids antibodies, homozygous factor V Leiden)
• previous documented episode of proximale deep vein thrombosis or pulmonary embolism
• other indication for anticoagulant therapy (e.g.:atrial fibrillation, mechanic valve)
• patient on antithrombotic agent in whom antithrombotic agent should be started again after stopping anticoagulation
• pregnancy
• women without contraception
• planned major surgery in the next 18 months
• ongoing cancer or cured cancer in less than 2 years
• serious bleeding risk (e.g.: gastric ulcer)
• platelet count less than 100 Giga/l
• Life expectancy less than 18 months

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

University Hospital, Brest

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Francis Couturaud, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

EA3878, IFR148

Locations

CHRU de Brest

Brest, , France

CHU de Grenoble

Grenoble, , France

Centre Hospitalier Pierre Le Damany

Lannion, , France

Centre Hospitalier de Bretagne Sud

Lorient, , France

Centre Hospitalier Universitaire de Nantes

Nantes, , France

AP HP Hôpital Hôtel Dieu

Paris, , France

Hôpital Européen Georges Pompidou

Paris, , France

CHU de POITIERS

Poitiers, , France

Centre Hospitalier de Cornouaille

Quimper, , France

CHU de Rennes

Rennes, , France

Centre Hospitalier de Saint Brieuc

Saint-Brieuc, , France

Hôpital de Rangueil

Toulouse, , France

CHU de Tours

Tours, , France

Centre Hospitalier Intercommunal

Vernon, , France

Countries

France

References

Couturaud F, Pernod G, Presles E, Duhamel E, Jego P, Provost K, Pan-Petesch B, Sollier CBD, Tromeur C, Hoffmann C, Bressollette L, Lorillon P, Girard P, Le Moigne E, Le Hir A, Guegan M, Laporte S, Mismetti P, Lacut K, Bosson JL, Bertoletti L, Sanchez O, Meyer G, Leroyer C, Mottier D; "PADIS-DVT" investigators. Six months versus two years of oral anticoagulation after a first episode of unprovoked deep-vein thrombosis. The PADIS-DVT randomized clinical trial. Haematologica. 2019 Jul;104(7):1493-1501. doi: 10.3324/haematol.2018.210971. Epub 2019 Jan 3.

Reference Type: DERIVED

PMID: 30606789 (View on PubMed)

Other Identifiers

RB06.019 PADIS TVP

Identifier Type: -

Identifier Source: org_study_id