- ICH GCP
- US Clinical Trials Registry
- Clinical Trial NCT00816920
Natural History of Isolated Deep Vein Thrombosis of the Calf (CALTHRO)
Diagnosis and Evolution of Isolated Deep Vein Thrombosis of the Calf in Symptomatic Outpatients. The Blind, Prospective "CALTHRO" Study.
Whether isolated distal DVT (IDDVT), DVT confined to the calf, should be looked for and diagnosed to allow them to be treated with anticoagulants remains one of the still unsolved issues in vascular medicine, especially because of the insufficient data on clinical risks of untreated distal DVT. Management studies have shown that it is safe to withhold anticoagulation in outpatients with suspected DVT if compression ultrasonography (CUS) limited to the proximal deep veins yields normal results on presentation and on repeated examination after 5 to 7 days. This strategy is based on the premise that IDDVT do not need to be diagnosed and treated, what is necessary when they extend involving the proximal veins. There is no general agreement, however, on the assumption that the non-extending IDDVT do not need to be diagnosed and treated, and many authors recommend to perform a single CUS examination extended to the distal deep veins. All the available studies have treated with anticoagulants the diagnosed IDDVT and no adequate information is available on the risk of IDDVT left untreated.
The present study, performed in outpatients with suspected leg DVT, aims at assessing the clinical consequences of IDDVT diagnosed (by a complete US investigation) but not treated because the results of this investigation remain blind to both the patient and the treating doctor, whereas the diagnostic-therapeutic procedure remains the usual one, based on CUS investigation limited to diagnose proximal DVT, to be repeated after 5-7 days (or earlier) to exclude an extension to proximal veins of an IDDVT potentially present.
Study Overview
Status
Conditions
Intervention / Treatment
Detailed Description
Study Type
Enrollment (Actual)
Contacts and Locations
Study Locations
-
-
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Bologna, Italy, 40138
- Angiology & Blood Coagulation, Policlinico S. Orsola-Malpighi
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Pescara, Italy, 65100
- Servizio di Fisiopatologia Vascoalre, Casa di Cura Villa Serena
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Participation Criteria
Eligibility Criteria
Ages Eligible for Study
Accepts Healthy Volunteers
Genders Eligible for Study
Sampling Method
Study Population
outpatients with suspected deep vein thrombosis (DVT) of a leg in whom a proximal DVT is excluded.
The study is not funded. As a result, it will not be possible to enroll all consecutive eligible patients; rather patients will be included based on the availability of expert medical staff in the day of their presentation (in general the first patient of the day).
Description
Inclusion Criteria:
- suspected deep vein thrombosis of a leg
- intermediate/high pre-test clinical probability or high D-dimer levels
Exclusion Criteria:
- age < 18 years
- presence of proximal DVT
- suspected isolated iliac DVT
- symptoms/signs lasting from > 30 days
- presence of symptoms of pulmonary embolism
- pregnancy or puerperium
- full dose treatment with heparin or derivatives from > 1 day
- presence of superficial vein thrombosis
- limited life expectancy (< 6 months)
- geographically inaccessible location
- inability or refusal to give consent
- participation in other clinical studies
Study Plan
How is the study designed?
Design Details
- Observational Models: Cohort
- Time Perspectives: Prospective
Cohorts and Interventions
Group / Cohort |
Intervention / Treatment |
---|---|
1
Outpatients with suspected leg DVT after exclusion of proximal DVT
|
Outpatients symptomatic for leg DVT follow the standard diagnostic procedure (ultrasound examination of proximal deep veins, pre-test clinical probability and D-dimer, and a second US after 5-7 days) to exclude proximal DVT; they also receive by another doctor a complete US examination of the deep leg veins to assess the presence of isolated calf DVT, the results of the latter examination are kept blind to the patient and to the treating doctor, and disclosed after three months
|
What is the study measuring?
Primary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
Thrombotic complications (deep vein thrombosis and/or pulmonary embolism within three months from first examination
Time Frame: three months from first examination
|
three months from first examination
|
Secondary Outcome Measures
Outcome Measure |
Time Frame |
---|---|
other vascular complications; how many isolated distal DVT will be diagnosed
Time Frame: three months from first examination
|
three months from first examination
|
Collaborators and Investigators
Investigators
- Principal Investigator: Gualtiero Palareti, MD, Azienda Ospedaliero-Universitaria di Bologna, Policlinico S. Orsola-Malpighi
Study record dates
Study Major Dates
Study Start
Primary Completion (Actual)
Study Completion (Actual)
Study Registration Dates
First Submitted
First Submitted That Met QC Criteria
First Posted (Estimate)
Study Record Updates
Last Update Posted (Actual)
Last Update Submitted That Met QC Criteria
Last Verified
More Information
Terms related to this study
Additional Relevant MeSH Terms
Other Study ID Numbers
- 24/2001/O EM60/2007/O
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.
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