Status: Ongoing
First registered on:
20/05/2015
Last updated on:
20/05/2015
1. Study identification
EU PAS Register NumberEUPAS9771
Official titleThe Comparative Safety and Effectiveness of Warfarin and Dabigatran Utilized in the Department of Defense (DoD) Non-Valvular Atrial Fibrillation (NVAF) Patient Population-A Retrospective Database Analysis
Study title acronym
Study typeObservational study
Brief description of the studyThis study is of a retrospective cohort design with propensity score matching. The primary study objective is to assess the safety and effectiveness of dabigatran compared to warfarin in patients diagnosed with non-valvular atrial fibrillation in the DoD population.
Was this study requested by a regulator?No
Is the study required by a Risk Management Plan (RMP)?
Regulatory procedure number (RMP Category 1 and 2 studies only)
Other study registration identification numbers and URLs as applicable
2. Research centres and Investigator details
Coordinating study entity
Centre to which the investigator belongsEvidera
Department/Research group
Organisation/affiliationEvidera
Details of (Primary) lead investigator
Title Mr
Last name Evidera
First name Evidera
Is this study being carried out with the collaboration of a research network?
No
Other centres where this study is being conducted
Not applicable (single centre)
Countries in which this study is being conducted
National study
United States
3. Study timelines: initial administrative steps, progress reports and final report
PlannedActual
Date when funding contract was signed27/09/201327/09/2013
Start date of data collection22/01/201422/01/2014
Start date of data analysis04/07/201423/05/2014
Date of interim report, if expected
Date of final study report15/06/2015
4. Sources of funding
Please provide estimates of the percentage of funding by source for this study
Names(s)Approximate % funding
Pharmaceutical companiesBoehringer Ingelheim Pharmaceuticals, Inc.100
Charities
Government body
Research councils
EU funding scheme
5. Contact details for enquiries
Scientific Enquiries
Title Mr
Last name Evidera
First name Evidera
Address line 1430 Bedford St., Suite 300
Address line 2
Address line 3
CityLexington
Postcode02420
CountryUnited States
Phone number (incl. country code)14108274780
Alternative phone number
Fax number (incl. country code)
Public Enquiries
Title Mr
Last name Evidera
First name Evidera
Address line 1430 Bedford St., Suite 300
Address line 2
Address line 3
CityLexington
Postcode02420
CountryUnited States
Phone number (incl. country code)14108274780
Alternative phone number
Fax number (incl. country code)
6. Study drug(s) information
Product NamePradaxa
CountryUnited States
Substance INN(s)DABIGATRAN ETEXILATE
Product NameWarfarin
CountryUnited States
Substance INN(s)WARFARIN SODIUM
7. Medical conditions to be studied
Medical condition(s)Yes
Atrial fibrillation
8. Population under study
Age
Adults (18 - 44 years)
Adults (45 - 64 years)
Adults (65 - 74 years)
Adults (75 years and over)
Sex
Male
Female
9. Number of subjects
Estimated total number of subjects28000
10. Source of data
Is this study being carried out with an established data source?No
Sources of data
Administrative database, e.g. claims database
11. Scope of the study
What is the scope of the study?
Risk assessment
Drug utilisation study
Effectiveness evaluation
Primary scope : Risk assessment
12. Main objective(s)
What is the main objective of the study?
To assess the safety and effectiveness of dabigatran and warfarin in patients diagnosed with non-valvular atrial fibrillation in the DoD population.
Are there primary outcomes?Yes
stroke (hemorrhagic, ischemic), major bleeding
Are there secondary outcomes?Yes
Ischemic stroke, Hemorrhagic stroke, Major Intracranial bleeding, Major Extracranial bleeding (Major GI bleeding (upper and lower), Major Urogenital bleeding, Major Other bleeding), Transient ischemic attack (TIA), Myocardial infarction (MI),Venous thromboembolism (VTE; deep vein thrombosis [DVT] or pulmonary embolism [PE]), Death (all cause)
13. Study design
What is the design of the study?
Cohort study
14. Follow-up of patients
Will patients be followed up?Yes
Please describe duration of follow up
minimum of 12 months of retrospective follow-up, study period October 1, 2009 through July 31, 2013
15. Data analysis plan
Please provide a brief summary of the analysis method
Patients will be followed until OAC discontinuation/switch, disenrollment, death, or study end (whichever occurs first). Baseline characteristics for the study cohorts will be described and compared for the dabigatran (DE) and warfarin cohorts before and after propensity score matching (PSM). Inferential statistics will be used to analyze post-match differences between cohorts. For categorical variables, chi-square tests will be used, and for interval variables, t-tests or, if distribution is not normal, Wilcoxon rank sum test will be conducted. For the comparison of baseline characteristics before and after PSM, a conventional alpha of 0.05 and two-tailed level of significance will be used unless otherwise specified. To compare the occurrence of primary and secondary outcomes between DE and warfarin cohorts, time to event will be investigated using non-parametric Kaplan-Meier (KM) survival analyses. Cox proportional hazards models will be implemented if the PSM leaves imbalance.
16. ENCePP seal
Are you requesting the ENCePP seal for this study?
No
17. Full protocol
Not submitted
18. Study Results
Not submitted
Please list the 5 most relevant publications using data from your study
ReferenceLink to web-publication
None
19. Other relevant documents
Conflict(s) of interest of
investigator(s)Not submitted
Composition of Steering Group and
ObserversNot submitted
Other documentsNot
submitted
Signed Code of
Conduct Checklist
Not submitted
Signed Code of Conduct Declaration
Not submitted
Signed Checklist for Study
Protocols
Not submitted
