Prolongation of the Interval Between Prothrombin Time Tests in Stable Patients II

NCT ID: NCT01654042

Last Updated: 2014-03-20

Basic Information

• Recruitment Status: WITHDRAWN
• Clinical Phase: PHASE3
• Study Classification: INTERVENTIONAL
• Study Start Date: 2014-04-30
• Study Completion Date: 2018-10-31

Brief Summary

More than 2 million patients in North America are treated with warfarin - a "blood thinner" - to prevent blood clots in arteries or veins. The treatment has to be monitored with a blood test and the dose changed accordingly every 1-4 weeks. One third of the patients have very stable results and hardly ever have to change the dose. The investigators wish to show that the level of control of the treatment with warfarin in these very stable patients is not worse with 12-weekly testing. A pilot study the investigators performed indicated that 12-weekly testing would be safe but this has to be confirmed in a large study. One third of patients taking warfarin have not had any changes in the dose for the past 6 months or longer. These patients will be asked about participation in the study. They will be randomized to testing and dosing every 4 or 12 weeks. Each patient is in the study until it ends, which will be minimum 1 year and can be up to about 4 years. The study is designed to show that 12-weekly testing does not significantly increase the risk for major bleeding or blood clots. The results would be important for a large number of patients. An increase of the interval between blood tests from 4 to 12 weeks would reduce the burden for these patients on life-long treatment considerably.

Detailed Description

The study is a randomized, controlled, open-label, multi-center non-inferiority trial to demonstrate that the interval between internation normalized ration (INR) tests can be extended from the recommended 4 weeks to 12 weeks for patients with stable INRs. PROBE design. Patients receiving warfarin therapy that have exhibited INR stability, defined as no change in maintenance dose for at least 6 months, are potentially eligible for enrolment in the study. The primary outcome is a composite of major bleeding (ISTH criteria) plus objectively verified arterial or venous thromboembolism (excluding superficial thrombophlebitis) plus death related to thromboembolism. Justification: the study is not reflecting a "trade-off" scenario where one regimen is expected to be more effective at the cost of increased harm compared to the other regimen. Conversely, the potential disadvantage of the experimental regimen in this trial is increased variability in INR, which may result in an increased rate of low as well as high INRs and therefore potentially an increase of both types of clinical events.

Conditions

Atrial Fibrillation; Valvular Heart Disease; Deep Vein Thrombosis; Pulmonary Embolism; Peripheral Arterial Disease

Study Design

• Allocation Method: RANDOMIZED
• Intervention Model: PARALLEL
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

Standard interval between PT testing

Prothrombin time (PT) is tested every 4 weeks, according to American College of Chest Physicians (ACCP) Guidelines up to 2008 for stable patients on warfarin.

Group Type: NO_INTERVENTION

No interventions assigned to this group

Prolonged interval between PT testing

Prothrombin time (PT) is tested every 12 weeks, according to suggestion in American College of Chest Physicians (ACCP) Guidelines of 2012 for stable patients on warfarin.

Group Type: EXPERIMENTAL

Prolonged interval between PT testing

Intervention Type: OTHER

Patients in the intervention group will be scheduled for prothrombin time testing and dosing of warfarin every 12 weeks instead of every 4 weeks. This has been suggested in the latest edition of the ACCP guidelines as a possibility for very stable patients. In order to change this from a suggestion to a formal recommendation a study powered for clinically important outcomes is needed.

Interventions

Prolonged interval between PT testing

Patients in the intervention group will be scheduled for prothrombin time testing and dosing of warfarin every 12 weeks instead of every 4 weeks. This has been suggested in the latest edition of the ACCP guidelines as a possibility for very stable patients. In order to change this from a suggestion to a formal recommendation a study powered for clinically important outcomes is needed.

Intervention Type: OTHER

Other Intervention Names

INR (International Normalized Ratio) tests

Eligibility Criteria

Inclusion Criteria

• long-term warfarin for prophylaxis of arterial embolism due to atrial fibrillation or mechanical heart valve replacement OR secondary prophylaxis after VTE
• therapeutic INR range of 2.0-3.0 or 2.5-3.5
• anticoagulation therapy has been managed by the study site for at least 6 months prior to enrollment
• warfarin maintenance dose has remained unchanged for the previous 6 months or longer

Exclusion Criteria

• Age < 18 years
• Life expectancy of less than 1 year
• Congestive heart failure or other diagnosis where the condition or its treatment is expected to affect the stability of INR (e.g. cancer requiring chemotherapy)
• Attending physician believes that patient is not suitable for the study (for instance, psychiatric disorder; history of non-compliance; newly diagnosed disease which by itself, via the treatment required or the effects thereof may cause instability of INRs)
• Patients who perform self-testing
• Geographic inaccessibility
• Failure to obtain written consent

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

McMaster University

OTHER

Sponsor Role: lead

Responsible Party

Sam Schulman

SSchulman

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Sam Schulman, MD, PhD

Role: PRINCIPAL_INVESTIGATOR

McMaster University

Locations

Hamilton Health Sciences - General Hospital

Hamilton, Ontario, Canada

Countries

Canada

References

Schulman S, Parpia S, Stewart C, Rudd-Scott L, Julian JA, Levine M. Warfarin dose assessment every 4 weeks versus every 12 weeks in patients with stable international normalized ratios: a randomized trial. Ann Intern Med. 2011 Nov 15;155(10):653-9, W201-3. doi: 10.7326/0003-4819-155-10-201111150-00003.

Reference Type: BACKGROUND

PMID: 22084331 (View on PubMed)

Pengo V, Barbero F, Biasiolo A, Pegoraro C, Cucchini U, Iliceto S. A comparison between six- and four-week intervals in surveillance of oral anticoagulant treatment. Am J Clin Pathol. 2003 Dec;120(6):944-7. doi: 10.1309/U716-4E0X-H5UE-RKRV.

Reference Type: BACKGROUND

PMID: 14671984 (View on PubMed)

Other Identifiers

PRINT-II-2012

Identifier Type: -

Identifier Source: org_study_id