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

This study is currently recruiting participants.
Verified June 2013 by Intermountain Health Care, Inc.
Information provided by (Responsible Party):
Scott M. Stevens, Intermountain Health Care, Inc.
ClinicalTrials.gov Identifier:
First received: March 17, 2011
Last updated: June 24, 2013
Last verified: June 2013

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 Intervention
Deep Vein Thrombosis
Other: Whole-leg compression ultrasound

Study Type: Interventional
Study Design: Allocation: Non-Randomized
Endpoint Classification: Safety Study
Intervention Model: Single Group Assignment
Masking: Open Label
Primary Purpose: Diagnostic
Official Title: Use of Whole-leg Ultrasound for Diagnosis of Deep Vein Thrombosis in Pregnant Patients

Resource links provided by NLM:

Further study details as provided by Intermountain Health Care, Inc.:

Primary Outcome Measures:
  • Symptomatic VTE [ Time Frame: Three months ] [ Designated as safety issue: Yes ]
    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:
  • Isolated iliac DVT [ Time Frame: At enrollment ] [ Designated as safety issue: Yes ]
    The exact rate of isolated iliac vein DVT identified on futher testing performed on the basis of suspicious doppler ultrasound findings.

Estimated Enrollment: 268
Study Start Date: February 2011
Estimated Study Completion Date: August 2014
Estimated Primary Completion Date: May 2014 (Final data collection date for primary outcome measure)
Intervention Details:
    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.
  Show Detailed Description


Ages Eligible for Study:   18 Years and older
Genders 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.
  Contacts and Locations
Please refer to this study by its ClinicalTrials.gov identifier: NCT01319474

United States, Utah
Intermoutain Medical Center Recruiting
Murray, Utah, United States, 84157
Contact: Scott M Stevens, MD    801-507-3310    scott.stevens@imail.org   
Principal Investigator: Scott M Stevens, MD         
Sponsors and Collaborators
Intermountain Health Care, Inc.
Principal Investigator: Scott M Stevens, MD Intermountain Health Care, Inc.
  More Information

Responsible Party: Scott M. Stevens, Transitional Year Program Director, Intermountain Health Care, Inc.
ClinicalTrials.gov Identifier: NCT01319474     History of Changes
Other Study ID Numbers: 950359
Study First Received: March 17, 2011
Last Updated: June 24, 2013
Health Authority: United States: Institutional Review Board

Keywords provided by Intermountain Health Care, Inc.:
Deep vein thrombosis
Pulmonary embolism

Additional relevant MeSH terms:
Venous Thrombosis
Embolism and Thrombosis
Vascular Diseases
Cardiovascular Diseases

ClinicalTrials.gov processed this record on April 17, 2014