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Whole-leg Ultrasound in Pregnant Patients (CLOT-3)

The safety and scientific validity of this study is the responsibility of the study sponsor and investigators. Listing a study does not mean it has been evaluated by the U.S. Federal Government. Know the risks and potential benefits of clinical studies and talk to your health care provider before participating. Read our disclaimer for details. Identifier: NCT01319474
Recruitment Status : Recruiting
First Posted : March 21, 2011
Last Update Posted : August 7, 2019
Information provided by (Responsible Party):
Scott M. Stevens, Intermountain Health Care, Inc.

Brief Summary:
This study seeks to determine the rate of thromboembolic complications (blood clots), including death attributed to thromboembolic disease, when anticoagulation (blood thinner) therapy is withheld from pregnant patients suspected of deep vein thrombosis (DVT) after a whole-leg compression ultrasound shows no DVT. Patients are followed for three months after the ultrasound to determine if a blood clot is diagnosed during that time.

Condition or disease Intervention/treatment Phase
Deep Vein Thrombosis Other: Whole-leg compression ultrasound Not Applicable

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Study Type : Interventional  (Clinical Trial)
Estimated Enrollment : 268 participants
Allocation: N/A
Intervention Model: Single Group Assignment
Masking: None (Open Label)
Primary Purpose: Diagnostic
Official Title: Use of Whole-leg Ultrasound for Diagnosis of Deep Vein Thrombosis in Pregnant Patients
Study Start Date : February 2011
Estimated Primary Completion Date : July 31, 2020
Estimated Study Completion Date : December 31, 2020

Resource links provided by the National Library of Medicine

Arm Intervention/treatment
Ultrasound for suspected DVT
Enrolled subjects suspected to have deep vein thrombosis undergo whole-leg compression ultrasound. Those with a normal result undergo clinical follow-up for thrombotic outcomes over the following three months.
Other: Whole-leg compression ultrasound
Duplex ultrasound assessment of the venous system of the leg(s) suspected of deep vein thrombosis. Assessment occurs from the most proximal assessable portion of the common femoral vein (usually at the inguinal ligament) to the level of the malleolus.

Primary Outcome Measures :
  1. Symptomatic VTE [ Time Frame: Three months ]
    The primary outcome measure will be DVT or PE, or death attributable to thromboembolic disease confirmed by objective testing in the 3 months following enrollment.

Secondary Outcome Measures :
  1. Isolated iliac DVT [ Time Frame: At enrollment ]
    The exact rate of isolated iliac vein DVT identified on futher testing performed on the basis of suspicious doppler ultrasound findings.

Information from the National Library of Medicine

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

Inclusion Criteria:

  • Be suspected by the referring medical provider to have a first episode of acute DVT of the lower extremities.
  • Be presenting for the initial diagnostic ultrasound for the present symptom complex.
  • Pregnancy confirmed by an objective test.
  • Be > 18 years old.
  • Provide written informed consent.

Exclusion Criteria:

  • Compression ultrasonography cannot be performed due to physical or technical reasons.
  • The patient has a prior history of DVT in the ipsilateral leg.
  • Previous venous ultrasound has been performed during the same pregnancy.
  • The patient is suspected by the referring clinician to have symptomatic pulmonary embolism.
  • Long-term follow-up will not be possible due to geographic inaccessibility, homelessness or lack of a telephone.
  • Therapeutic doses of an anticoagulant have been received for more than 24 hours before enrollment.
  • Long term anticoagulation will be required for another diagnosis (e.g. atrial fibrillation).
  • Informed consent cannot be obtained.

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its identifier (NCT number): NCT01319474

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Contact: Valerie Aston, MBA, RT (801) 507-4606
Contact: Scott Stevens, MD (801) 507- 3747

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United States, Utah
Intermoutain Medical Center Recruiting
Murray, Utah, United States, 84157
Contact: Scott M Stevens, MD    801-507-3310   
Principal Investigator: Scott M Stevens, MD         
Sponsors and Collaborators
Intermountain Health Care, Inc.
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Principal Investigator: Scott M Stevens, MD Intermountain Health Care, Inc.
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Responsible Party: Scott M. Stevens, Transitional Year Program Director, Intermountain Health Care, Inc. Identifier: NCT01319474    
Other Study ID Numbers: 950359
First Posted: March 21, 2011    Key Record Dates
Last Update Posted: August 7, 2019
Last Verified: August 2019
Keywords provided by Scott M. Stevens, Intermountain Health Care, Inc.:
Deep vein thrombosis
Pulmonary embolism
Additional relevant MeSH terms:
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Venous Thrombosis
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases