Compression stockings to prevent post-thrombotic syndrome: the SOX trial

ISRCTN ISRCTN71334751
DOI https://doi.org/10.1186/ISRCTN71334751
ClinicalTrials.gov number NCT00143598
Secondary identifying numbers MCT-63142
Submission date
01/09/2005
Registration date
01/09/2005
Last edited
10/11/2015
Recruitment status
No longer recruiting
Overall study status
Completed
Condition category
Circulatory System
Prospectively registered
Protocol
Statistical analysis plan
Results
Individual participant data

Plain English summary of protocol

Not provided at time of registration

Contact information

Dr Susan Rebecca Kahn
Scientific

Center for Clinical Epidemiology and Community Studies
SMBD Jewish General Hospital
3755 Cote Ste. Catherine Rm A-127
Montreal, Quebec
H3T 1E2
Canada

Phone +1 (0)514 3408222 (4667)
Email susan.kahn@mcgill.ca
Ms Susan Kahn
Public

SMBD Jewish General Hospital
3755 Cote Ste. Catherine Rm A-127
Montreal, Quebec
H3T 1E2
Canada

Phone +1 (0)514 340 8222 ext. 4667
Email susan.kahn@mcgill.ca

Study information

Study designMulticentre two-arm placebo randomised parallel device trial with study participant, study investigator, and outcome assessor blinded.
Primary study designInterventional
Secondary study designRandomised controlled trial
Study setting(s)Hospital
Study typeTreatment
Participant information sheet Not available in web format, please use the contact details below to request a patient information sheet
Scientific titleCompression stockings to prevent post-thrombotic syndrome: a multicentre, two arm, placebo-controlled randomised parallel device trial
Study acronymSOX
Study objectivesTo determine whether Elastic Compression Stockings (ECS) used for two years are effective in preventing the Post-Thrombotic Syndrome (PTS) in patients with symptomatic proximal Deep Venous Thrombosis (DVT).

Previous hypothesis:
To determine whether Elastic Compression Stockings (ECS) used for two years, and celecoxib, a COX-II inhibitor, used for 30 days are effective in preventing the Post-Thrombotic Syndrome (PTS) in patients with symptomatic proximal Deep Venous Thrombosis (DVT).

Sub -study registered with ClinicalTrials.gov: NCT01615705 - Biomarker Sub Study of the Compression Stockings to Prevent the Post-Thrombotic Syndrome (SOX) Trial (Bio-SOX)

Sub -study registered with ClinicalTrials.gov: NCT01615692 - The 36-month Extension to Follow up Sub Study
Ethics approval(s)1. Canada: The Research Ethics Committee of Sir Mortimer B Davis Jewish General Hospital, 30/07/2003. This ethics approval was amended on 27/01/2005 to take into account the removal of the celecoxib intervention and consequent protocol changes.
2. USA: The University of Oklahoma Health Sciences Center Institutional Review Board (USA), 31/07/2007, ref: 13513. All other centres subsequent to this in the USA will require full ethics approval before recruiting participants.
Health condition(s) or problem(s) studiedDeep vein thrombosis
InterventionCurrent interventions (protocol updated in January 2005):
1. Experimental interventions: knee-length, 30 - 40 mmHg (Class II), graduated ECS worn on the DVT-affected leg daily, applied upon waking and removed upon retiring, beginning within a week (as soon as possible) after DVT diagnosis, and continued for two years
2. Control interventions: knee-length, inactive (i.e. no compression) stocking, identical in appearance to active ECS, worn on the DVT-affected leg daily, applied upon waking and removed upon retiring, beginning within a week (as soon as possible) after DVT diagnosis, and continued for two years

Previous interventions:
1. Experimental interventions:
1.1. Knee-length, 30 - 40 mmHg (Class II), graduated ECS worn on the DVT-affected leg daily, applied upon waking and removed upon retiring, beginning within a week (as soon as possible) after DVT diagnosis, and continued for two years
1.2. Celecoxib, 200 mg orally (po) twice a day (BID), begun on the day of DVT diagnosis and continued for 30 days
2. Control interventions:
2.1. Knee-length, inactive (i.e. no compression) stocking, identical in appearance to active ECS, worn on the DVT-affected leg daily, applied upon waking and removed upon retiring, beginning within a week (as soon as possible) after DVT diagnosis, and continued for two years
2.2. Placebo, identical in appearance to celecoxib, one tablet po BID, begun on the day of DVT diagnosis and continued for 30 days
Intervention typeOther
Primary outcome measureIncidence of post-thrombotic syndrome (PTS) at two years
Secondary outcome measuresCurrent secondary outcome measures (protocol updated in January 2005):
1. Severity of PTS at two years follow up, including incidence of venous ulcer
2. Incidence of objectively confirmed recurrent VTE, and death from VTE, over two years
3. C-reactive protein at 30 days compared to baseline value
4. Quality of life over the two-year follow up
5. Cost-effectiveness

Previous secondary outcome measures:
1. Severity of PTS at two years follow up, including incidence of venous ulcer
2. Incidence of objectively confirmed recurrent VTE, and death from VTE, over two years
3. Incidence of major bleeding or arterial thrombotic events during the first 60 days
4. C-reactive protein at 30 days compared to baseline value
5. Quality of life over the two-year follow up
6. Cost-effectiveness
Overall study start date01/04/2003
Completion date31/01/2012

Eligibility

Participant type(s)Patient
Age groupAdult
Lower age limit18 Years
SexBoth
Target number of participants800
Key inclusion criteriaCurrent inclusion criteria (protocol updated in August 2008):
Consecutive patients aged greater than or equal to 18 years old, either sex, with a first, symptomatic, objectively confirmed proximal DVT diagnosed within the last 14 days (with or without concurrent distal DVT or Pulmonary Embolism [PE]) who have no contraindications to standard treatment with heparin and/or warfarin, and who provide informed consent to participate.

Previous inclusion criteria (January 2005):
Consecutive patients aged greater than or equal to 18 years old, either sex, with a first, symptomatic, objectively confirmed proximal DVT diagnosed within the last 10 days (with or without concurrent distal DVT or Pulmonary Embolism [PE]) who have no contraindications to standard treatment with heparin and/or warfarin, and who provide informed consent to participate.

Initial inclusion criteria (January 2004):
Consecutive patients with a first, symptomatic, objectively confirmed proximal DVT diagnosed within the last 72 hours (with or without concurrent distal DVT or Pulmonary Embolism [PE]) who have no contraindications to standard treatment with heparin and/or warfarin, and who provide informed consent to participate.
Key exclusion criteriaCurrent exclusion criteria (protocol updated in January 2005):
1. Contraindication to compression stockings
2. Limited lifespan (estimated less than six months)
3. Geographic inaccessibility preventing return for follow-up visits
4. Inability to apply stockings daily and unavailability of a caregiver to apply stockings daily
5. Treatment of acute DVT with thrombolytic agents

Previous exclusion criteria:
1. Contraindication to compression stockings
2. Contraindication to celecoxib
3. History of warfarin, aspirin or Non-Steroidal Anti-Inflammatory Drug (NSAID)-associated major haemorrhagic event
4. Regular, daily use of NSAIDs
5. Inability/unwillingness to stop anti-platelet drugs for 30 days
6. Limited lifespan (estimated less than six months)
7. Geographic inaccessibility preventing return for follow-up visits
8. Inability to apply stockings daily and unavailability of a caregiver to apply stockings daily
9. Treatment of acute DVT with thrombolytic agents
Date of first enrolment01/04/2003
Date of final enrolment17/02/2010

Locations

Countries of recruitment

  • Canada
  • United States of America

Study participating centre

SMBD Jewish General Hospital
Montreal, Quebec
H3T 1E2
Canada

Sponsor information

Sir Mortimer B. Davis Jewish General Hospital-Mtl (Canada)
Not defined

3755 Côte Ste-Catherine Road
Montreal, Quebec
H3T 1E2
Canada

Phone +1 (0)514 340 8222
Email wainberg@ldi.jgh.mcgill.ca
ROR logo "ROR" https://ror.org/056jjra10

Funders

Funder type

Industry

Canadian Institutes of Health Research
Government organisation / National government
Alternative name(s)
Instituts de Recherche en Santé du Canada, Canadian Institutes of Health Research (CIHR), CIHR_IRSC, Canadian Institutes of Health Research | Ottawa ON, CIHR, IRSC
Location
Canada
SIGVARIS Corp. (Canada)

No information available

Results and Publications

Intention to publish date
Individual participant data (IPD) Intention to shareNo
IPD sharing plan summaryNot provided at time of registration
Publication and dissemination planNot provided at time of registration
IPD sharing plan

Study outputs

Output type Details Date created Date added Peer reviewed? Patient-facing?
Basic results No No
Protocol article protocol 24/07/2007 Yes No
Results article results 08/03/2014 Yes No
Results article results 01/12/2014 Yes No

Editorial Notes

Please note that in 2005, the intervention using Celecoxib was removed from this trial due to reports of negative effects in a large colorectal cancer prevention clinical trial. Thus, the SOX Trial protocol was amended to take this into account. The most recent changes to the protocol were made to this trial record on the 10/06/2009.

Due to the removal of the Celecoxib intervention, the recruitment resumed in February 2005, and the overall trial end date has now been extended by one year to 30/12/2011 (amended 10/06/2009). The previous overall trial end date was 30/03/2008 (amended 13/05/2008).

As of 17/02/2010 this record has been updated to include an extended overall trial end date; the initial overall trial end date of this record was 30/12/2011. Please note that enrolment to this trial is now completed.