D-dimer to Select Patients With First Unprovoked Venous Thromboembolism Who Can Have Anticoagulants Stopped at 3 Months (DODS)

December 12, 2016 updated by: McMaster University

A Cohort Study to Test That There is a Low Risk of Recurrent VTE in Patients With a First Episode of Unprovoked VTE Who Stop Anticoagulant Therapy After 3 Months of Treatment in Response to Negative D-dimer Testing

The purpose of this study is to determine if the risk of recurrent venous thromboembolism (VTE) after stopping therapy is low and acceptable in patients with a first unprovoked proximal deep vein thrombosis (DVT) or pulmonary embolism (PE) who have completed 3 months of therapy and who have a negative D-dimer test on therapy and 1 month after stopping therapy.

Study Overview

Status

Status

Indicates the current recruitment status or the expanded access status.
Completed

Conditions

Conditions

The disease, disorder, syndrome, illness, or injury that is being studied. On ClinicalTrials.gov, conditions may also include other health-related issues, such as lifespan, quality of life, and health risks.

Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.

Study Type

Study Type

Describes the nature of a clinical study. Study types include interventional studies (also called clinical trials), observational studies (including patient registries), and expanded access.
Interventional

Enrollment (Actual)

Enrollment

The number of participants in a clinical study. The "anticipated" enrollment is the target number of participants that the researchers need for the study.
410

Phase

Phase

The stage of a clinical trial studying a drug or biological product, based on definitions developed by the U.S. Food and Drug Administration (FDA). The phase is based on the study's objective, the number of participants, and other characteristics. There are five phases: Early Phase 1 (formerly listed as Phase 0), Phase 1, Phase 2, Phase 3, and Phase 4. Not Applicable is used to describe trials without FDA-defined phases, including trials of devices or behavioral interventions.
  • Not Applicable

Contacts and Locations

This section provides the contact details for those conducting the study, and information on where this study is being conducted.

Study Locations

  • Canada
    • Ontario
      • Hamilton, Ontario, Canada, L8N 3Z5
        • McMaster University
      • Hamilton, Ontario, Canada, L8L 2X2
        • Hamilton General Hospital
      • Hamilton, Ontario, Canada, L8N 4A6
        • St. Joseph's Health Care Centre
      • Hamilton, Ontario, Canada, L8V1C3
        • Henderson Hospital
  • Ireland
      • Limerick, Ireland
        • Limerick, Mid Western Regional Hospital
  • United Kingdom
      • Cambridge, United Kingdom, B2 0QQ
        • Addenbrooke's Hospital
  • United States
    • District of Columbia
      • Washington, District of Columbia, United States, 20057
        • Lombardi Cancer Center
    • Iowa
      • Iowa City, Iowa, United States, 52242
        • University of Iowa Hospitals and Clinics
    • Massachusetts
      • Boston, Massachusetts, United States, 02115
        • Brigham and Women's Hospital
      • Boston, Massachusetts, United States, 02215
        • Beth Israel Deaconess Medical Centre
    • Michigan
      • Detroit, Michigan, United States, 48202
        • Henry Ford Hospital
    • North Carolina
      • Chapel Hill, North Carolina, United States, 27599-7035
        • UNC Thrombophilia Program
    • Utah
      • Murray, Utah, United States, 84152
        • Intermountain Medical Centre

Participation Criteria

Researchers look for people who fit a certain description, called eligibility criteria. Some examples of these criteria are a person's general health condition or prior treatments.

Eligibility Criteria

Eligibility Criteria

The key requirements that people who want to participate in a clinical study must meet or the characteristics they must have. Eligibility criteria consist of both inclusion criteria (which are required for a person to participate in the study) and exclusion criteria (which prevent a person from participating). Types of eligibility criteria include whether a study accepts healthy volunteers, has age or age group requirements, or is limited by sex.

Ages Eligible for Study

18 years to 75 years (Adult, Older Adult)

Accepts Healthy Volunteers

No

Genders Eligible for Study

All

Description

Inclusion Criteria:

  1. Be >= 18 years of age
  2. Have had ONE episode of unprovoked proximal DVT and/or PE
  3. Have completed 3 uninterrupted months of warfarin therapy (target INR of 2.0-3.0)

Exclusion Criteria:

  1. Another indication for long-term anticoagulation (e.g., atrial fibrillation)

  2. A high risk of bleeding as evidenced by any of the following:

    • Age greater than 75 years
    • Previous episode of major bleeding where the cause was not effectively treated
    • Known chronic thrombocytopenia with a platelet count of less than 120,000 x 10^9 /L
    • Known chronic renal impairment with a creatinine of more than 150 mumols /litre (1.7 mg/dl)
    • Known chronic liver disease with a total bilirubin of more than 25 mumols /litre (1.5 mg/dl)
    • Active peptic ulcer disease
    • Poor compliance with, or control of, anticoagulant therapy during initial treatment
    • Requires dual antiplatelet therapy (e.g. aspirin and clopidogrel)
  3. A vena caval filter
  4. Has had D-dimer testing performed within 2 months of potential enrollment other than for evaluation of suspected recurrent VTE that was not confirmed
  5. Has a life expectancy less than 5 years
  6. Is unable to attend follow-up visits because of geographic inaccessibility
  7. Is participating in a competing clinical investigation

Study Plan

This section provides details of the study plan, including how the study is designed and what the study is measuring.

How is the study designed?

Design Details

  • Primary Purpose: Treatment
  • Allocation: Non-Randomized
  • Interventional Model: Parallel Assignment
  • Masking: None (Open Label)

Arms and Interventions

Participant Group / Arm

Participant Group / Arm

A group or subgroup of participants in a clinical trial that receives a specific intervention/treatment, or no intervention, according to the trial's protocol.
Intervention / Treatment

Intervention / Treatment

A process or action that is the focus of a clinical study. Interventions include drugs, medical devices, procedures, vaccines, and other products that are either investigational or already available. Interventions can also include noninvasive approaches, such as education or modifying diet and exercise.
Other: No Anticoagulant Therapy
Other: Discontinue anticoagulant therapy (Negative d-dimer)
Patients with negative d-dimer discontinue long-term anticoagulant therapy.
Other: Anticoagulant Therapy
Continue on anticoagulant therapy
Other: Continue on anticoagulant therapy (positive d-dimer)
Patients with positive d-dimer continue or re-start on anticoagulant therapy

What is the study measuring?

Primary Outcome Measures

Primary Outcome Measures

In a clinical study's protocol, the planned outcome measure that is the most important for evaluating the effect of an intervention/treatment. Most clinical studies have one primary outcome measure, but some have more than one.
Outcome Measure
Time Frame
Suspected Recurrent DVT
Time Frame: up to 7 years
up to 7 years
Suspected (recurrent) pulmonary embolism
Time Frame: up to 7 years
up to 7 years
Bleeding
Time Frame: up to 7 years
up to 7 years
Death
Time Frame: up to 7 years
up to 7 years

Collaborators and Investigators

This is where you will find people and organizations involved with this study.

Sponsor

Sponsor

The organization or person who initiates the study and who has authority and control over the study.
McMaster University

Collaborators

Collaborators

An organization other than the sponsor that provides support for a clinical study. This support may include activities related to funding, design, implementation, data analysis, or reporting.
Canadian Institutes of Health Research (CIHR)

Investigators

Investigators

A researcher involved in a clinical study. Related terms include site principal investigator, site sub-investigator, study chair, study director, and study principal investigator.
  • Principal Investigator: Clive Kearon, MB MRCP(I) FRCP(C) PhD, McMaster University

Publications and helpful links

The person responsible for entering information about the study voluntarily provides these publications. These may be about anything related to the study.

General Publications

Study record dates

These dates track the progress of study record and summary results submissions to ClinicalTrials.gov. Study records and reported results are reviewed by the National Library of Medicine (NLM) to make sure they meet specific quality control standards before being posted on the public website.

Study Major Dates

Study Start

Study Start

The actual date on which the first participant was enrolled in a clinical study. The "anticipated" study start date is the date that the researchers think will be the study start date.
September 1, 2008

Primary Completion (Actual)

Primary Completion

The date on which the last participant in a clinical study was examined or received an intervention to collect final data for the primary outcome measure. Whether the clinical study ended according to the protocol or was terminated does not affect this date. For clinical studies with more than one primary outcome measure with different completion dates, this term refers to the date on which data collection is completed for all the primary outcome measures. The "anticipated" primary completion date is the date that the researchers think will be the primary completion date for the study.
December 1, 2016

Study Completion (Actual)

Study Completion

The date on which the last participant in a clinical study was examined or received an intervention/treatment to collect final data for the primary outcome measures, secondary outcome measures, and adverse events (that is, the last participant's last visit). The "anticipated" study completion date is the date that the researchers think will be the study completion date.
December 1, 2016

Study Registration Dates

First Submitted

First Submitted

The date on which the study sponsor or investigator first submitted a study record to ClinicalTrials.gov. There is typically a delay of a few days between the first submitted date and the record's availability on ClinicalTrials.gov (the first posted date).
July 21, 2008

First Submitted That Met QC Criteria

First Submitted That Met QC Criteria

The date on which the study sponsor or investigator first submits a study record that is consistent with National Library of Medicine (NLM) quality control (QC) review criteria. The sponsor or investigator may need to revise and submit a study record one or more times before NLM's QC review criteria are met. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
July 21, 2008

First Posted (Estimate)

First Posted

The date on which the study record was first available on ClinicalTrials.gov after National Library of Medicine (NLM) quality control (QC) review has concluded. There is typically a delay of a few days between the date the study sponsor or investigator submitted the study record and the first posted date.
July 23, 2008

Study Record Updates

Last Update Posted (Estimate)

Last Update Posted

The most recent date on which changes to a study record were made available on ClinicalTrials.gov. There may be a delay between when the changes were submitted to ClinicalTrials.gov by the study's sponsor or investigator (the last update submitted date) and the last update posted date.
December 13, 2016

Last Update Submitted That Met QC Criteria

Last Update Submitted That Met QC Criteria

The most recent date on which the study sponsor or investigator submitted changes to a study record that are consistent with National Library of Medicine (NLM) quality control (QC) review criteria. It is the responsibility of the sponsor or investigator to ensure that the study record is consistent with the NLM QC review criteria.
December 12, 2016

Last Verified

Last Verified

The most recent date on which the study sponsor or investigator confirmed the information about a clinical study on ClinicalTrials.gov as accurate and current. If a study with a recruitment status of recruiting; not yet recruiting; or active, not recruiting has not been confirmed within the past 2 years, the study's recruitment status is shown as unknown.
December 1, 2016

More Information

Terms related to this study

Keywords

Additional Relevant MeSH Terms

Other Study ID Numbers

Other Study ID Numbers

Identifiers or ID numbers other than the NCT number that are assigned to a clinical study by the study's sponsor, funders, or others. These numbers may include unique identifiers from other trial registries and National Institutes of Health grant numbers.
  • CTMG-2007-DODS

This information was retrieved directly from the website clinicaltrials.gov without any changes. If you have any requests to change, remove or update your study details, please contact register@clinicaltrials.gov. As soon as a change is implemented on clinicaltrials.gov, this will be updated automatically on our website as well.

Cookie Settings

We use cookies to ensure that we give you the best experience on our website. For more details carefully read our Privacy and Cookies Policy. ...>>>You can change your preferences or withdraw your consent at any time by deleting the cookies from your website or computer as described in the policy. Please accept it and choose your preferences by ticking the corresponding boxes in the "Manage Settings" section below. Please carefully read our Terms of Service before you proceed with using any part of this website.
«Manage Settings