Last updated on February 2018

DUTCH CAVA-trial: CAtheter Versus Anticoagulation Alone for Acute Primary (Ilio)Femoral DVT.

Brief description of study

Rationale: Iliofemoral deep venous thrombosis (IFDVT) is associated with significant post thrombotic morbidity. The presence of both obstruction and reflux significantly increases the chances for development of post-thrombotic syndrome (PTS). Early thrombolysis may reduce the incidence of PTS as compared to treatment with conventional anticoagulant medication alone. Improvement of the health related quality of life (HRQOL) has been reported after surgical clot removal. The investigators hypothesize that such improvements could also be reached after catheter directed thrombolysis.

Objective: To assess whether catheter directed thrombolytic therapy for the treatment of IFDVT can safely and effectively reduce post thrombotic morbidity after one year. The secondary objective is to study whether catheter directed thrombolytic intervention has a positive effect on the quality of life of patients with IFDVT and to assess late PTS.

Study design: prospective, non blinded, randomized, controlled, multicenter, intervention study

Study population: The study population includes all consecutive patients with IFDVT presenting at the emergency or outpatient departments of the participating centres. The thrombus should not be older than 14 days at randomization.

Intervention: After randomization patients will be allocated to either conservative anticoagulant treatment or to catheter directed thrombolysis combined with conservative anticoagulant treatment.

Main study parameters/endpoints: The primary efficacy outcome is the incidence of PTS at one year; a decline in PTS incidence from 25% to 8% is anticipated. The secondary outcome is the Health related Quality of life and late PTS during follow-up. The principal safety outcome is major bleeding during anticoagulant therapy. Bleeding as well as events of recurrent thrombosis will be monitored. The patency of the venous system of the affected lower limb will be assessed as well as the percentage of clot lysis, after thrombolytic intervention. Additionally, measurements of markers of coagulation and inflammation will be performed during follow-up.

Nature and extent of the burden and risks associated with participation, benefit and group relatedness: For patients who are randomized to the intervention arm of the study a hospital stay for 24-36 hour is mandatory during catheter directed thrombolysis. All patients will undergo additional imaging by MRA-vasovist and air phletysmography (APG) at baseline and after 12 months. Clinical follow-up visits will be matching usual care at 3, 6, 12 months; blood will be taken at these visits. Health-related quality of life (HRQOL) questionnaires will be filled out by all patients at baseline, 3, 6 and 12 months after the event; and once a year during the entire study duration. Further treatment will be in accordance with current guidelines for antithrombotic treatment. There may be an enhanced risk of bleeding in the thrombolysis group. The expected benefit is reduction of PTS from 25% to 8%, together with an improved quality of life.

Clinical Study Identifier: NCT00970619

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