ThRombosis ExclUsion STudy

Study Overview
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Brief Summary
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The purpose of this study is to demonstrate the ability of new D-Dimer assay combined with a clinical pretest probability (PTP) to safely exclude pulmonary embolism (PE) or Deep Venous Thrombosis (DVT) in a 3 month follow-up.

Detailed Description
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The study population will be selected from prospective, consecutive ambulatory outpatients suspected of having venous thromboembolism. Patients will be diagnosed for VTE (PE or DVT) based on local standard of care. Samples will be collected for future testing with new D-Dimer assay. In case of Low/Moderate PTP score and negative VTE diagnosis, patients will be followed for 3 months to evaluate potential development of deep venous thrombosis and/or pulmonary embolism.

Official Title
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ThRombosis ExclUsion STudy

Conditions
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Deep Venous Thromboses, Pulmonary Embolism, Venous Thromboembolism

Intervention / Treatment
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* Other: Plasma sampling


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: Patient is > 80 years old. Patient presents at least one of these symptoms indicative of proximal DVT or PE: symptoms for proximal DVT: leg pain, tenderness (discomfort through palpation), leg swelling, and /or edema, symptoms for PE: hemoptysis, lung related chest pain, dyspnea. Patient provides written informed consent to participate in the study Patient is willing to comply with specified follow-up evaluation at 3 months and can be contacted by telephone Exclusion Criteria: Patient presenting with a condition that may be associated with increased D-dimer levels, even in the absence of VTE, such as: Fibrinolytic therapy within the previous seven (7) days, Disseminated intravascular coagulation Bone fracture or surgery (with general anesthesia longer than thirty (30) minutes) within the previous one (1) month, Deep hematoma diagnosed by imaging techniques within the previous one (1) month, Disseminated malignancies and active cancer (active cancer defined as: cancer for which therapeutic or palliative treatment is either ongoing at the time of enrolment or has stopped less than six (6) months before enrolment), Sepsis, severe infections, pneumonia within the previous 1 month, Known liver cirrhosis, Pregnancy or having delivered within the previous 1 month, Atherosclerotic vascular disease thrombosis within the previous 1month (e.g. myocardial infarction, stroke, coronary syndrome, peripheral artery disease stage III or IV), Sickle cell disease, Patients presenting with a suspect thrombotic event related to catheter implantation Ongoing therapeutic anticoagulants (curative and preventive regimen) started twenty four (24) hours or more before blood draw (except aspirin and platelet inhibitors) Previous anticoagulant therapy stopped less than three (3) months before blood draw (except aspirin and platelet inhibitors) Patients with previous DVT/PE occurred less than three (3) months from screening. Suspect thrombotic events in other locations at screening, including distal to the knee and upper extremity DVT (based on standard of care examinations) Patients with known tissue plasminogen activator (tPA) deficiency Patient participating or who has participated within one month of enrolment in another investigational study Major co-morbid condition(s) or other reasons that could limit the patients ability to participate in the study or to comply with follow-up requirements, or impact the scientific integrity of the study.

Ages Eligible for Study
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Maximum Age: 80 Years

Sexes Eligible for Study
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All

Accepts Healthy Volunteers
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No

Study Plan
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How is the study designed?
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Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| PE<br>Patients presenting with PE suspicion. Diagnosis will be performed according to Standard of Care. Plasma samples will be collected if PTP score is Low or Moderate. If diagnosis is negative, patients will be followed for 3 months to evaluate potential VTE development. Enrolment completed for this group : 13th February 2020 | Other: Plasma sampling<br>* Additional blood draw or additional volume during blood draw<br>|
| DVT<br>Patients presenting with DVT suspicion. Diagnosis will be performed according to Standard of Care. Plasma samples will be collected if PTP score is Low or Moderate. If diagnosis is negative, patients will be followed for 3 months to evaluate potential VTE development. Enrolment on going | Other: Plasma sampling<br>* Additional blood draw or additional volume during blood draw<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| VTE Exclusion | To demonstrate the ability of new D-Dimer assay combined with a clinical pretest probability (PTP) to safely exclude pulmonary embolism or deep venous thrombosis as measured by Negative Predictive Value and sensitivity | Up to 4 months for patients with 3 months follow-up |