Replication of the RECOVER-II Anticoagulant Trial in Healthcare Claims Data

Mass General Brigham

Status

Completed

Conditions

Venous Thromboembolism

Treatments

Drug: Warfarin

Drug: Dabigatran

Study type

Observational

Funder types

Other

Identifiers

NCT04735523

2018P002966-DUP-RE-COVER II

Details and patient eligibility

About

Investigators are building an empirical evidence base for real world data through large-scale replication of randomized controlled trials. The investigators' goal is to understand for what types of clinical questions real world data analyses can be conducted with confidence and how to implement such studies.

Full description

This is a non-randomized, non-interventional study that is part of the RCT DUPLICATE initiative (www.rctduplicate.org) of the Brigham and Women's Hospital, Harvard Medical School. It is intended to replicate, as closely as possible in healthcare insurance claims data, the trial listed below/above. Although many features of the trial cannot be directly replicated in healthcare claims, key design features, including outcomes, exposures, and inclusion/exclusion criteria, were selected to proxy those features from the trial. Randomization is also not replicable in healthcare claims data but was proxied through a statistical balancing of measured covariates through standard practice. Investigators assume that the RCT provides the reference standard treatment effect estimate and that failure to replicate RCT findings is indicative of the inadequacy of the healthcare claims data for replication for a range of possible reasons and does not provide information on the validity of the original RCT finding.

Enrollment

5,350 patients

Sex

All

Ages

18 to 120 years old

Volunteers

No Healthy Volunteers

Inclusion and exclusion criteria

Please see https://drive.google.com/drive/folders/1WD618wrywYjEaXzfLTcuK-VCcnb6b-gV for full code and algorithm definitions.

Eligible cohort entry dates:

Market availability of dabigatran in the U.S. for treatment of deep vein thrombosis and pulmonary embolism started on April 7, 2014

For Medicare: April 7, 2014 - December 31, 2017 (end of available data)
For Marketscan: April 7, 2014 - December 31, 2018 (end of available data)
For Optum: April 7, 2014 - March 31, 2020 (end of available data)

Inclusion Criteria:

Acute deep vein thrombosis (DVT) of the leg involving proximal veins, and/or pulmonary embolism (PE) iin patients for whom at least 6 months of anticoagulant therapy is considered appropriate.
Men and women ages 18 years or greater

Exclusion Criteria:

PE satisfying at least one of the following criteria:
- Haemodynamic instability
- OR Embolectomy is indicated or performed
- OR thrombolytic therapy is indicated or performed
- OR suspected source of PE is other than blood clots from the legs
Actual or anticipated use of vena cava filter
Patients who in the investigators judgement are perceived as having an excessive risk of bleeding
Known anaemia
Need of anticoagulant treatment for disorders other than VTE
Recent unstable cardiovascular disease
Elevated AST or ALT > 3x ULN
Liver disease expected to have any potential impact on survival (severe liver conditions)
Severe renal impairment
Contraindications to anticoagulant therapy (not specified)
Recent or active major bleeding
Recent brain, eye, or spinal cord injury or surgery
Malignant or severe, uncontrolled hypertension
Active infective endocarditis
Mechanical prosthetic heart valve (recently implanted - RE-ALIGN trial)
Women who are pregnant, nursing, or of childbearing potential who refuse to use a medically acceptable form of contraception
Patients who have developed transaminase elevations upon exposure to ximelagatran
Patients considered unsuitable for inclusion by the investigator