ClinicalTrials.gg
CompletedNCT03254134Updated Jul 9, 2019Results posted

Comparative Effectiveness and Safety Between Warfarin and Dabigatran

An observational study in Atrial Fibrillation, sponsored by Boehringer Ingelheim. Completed at 1 site in Japan. Open to participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2019-07-09.

Sponsored by Boehringer Ingelheim · Observational

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Study type
Observational
Model
Cohort
Time perspective
Retrospective
Enrollment
22,490
Ages
18 Years and older
Sex
All
01

Where this study stands

Counted across the records on this site · 2026-11-15

Among 45 studies in Atrial Fibrillation by Boehringer Ingelheim — none open to participants now, none under way, none of them phase 3. Atrial Fibrillation · Boehringer Ingelheim.

Enrollment
13th of 36
22,490 · median 5,000
Started
2017
with 6 others
Observational
36 of 45
none open now
Registered
40th of 45
by date

Among the 45 studies in Atrial Fibrillation by Boehringer Ingelheim, this one is the 13th largest by enrollment of the 36 observational ones that give a count, is one of 7 that started in 2017, is one of 36 observational ones, and was the 40th registered.

Atrial Fibrillation

4,009 studies on the registry are indexed under Atrial Fibrillation; 960 are open to participants now.

Browse Atrial Fibrillation studies →

Open to participants now

None of the 45 studies in Atrial Fibrillation by Boehringer Ingelheim is open now. The open studies under Atrial Fibrillation, anywhere →

Who these studies take

Of the 611 Atrial Fibrillation studies recruiting now, 407 (67%) set no upper age limit and 43 (7%) stop at 75 or younger; 21 take children under 18; 43 take healthy volunteers.

This study: 18 Years and older · all sexes · no healthy volunteers.

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Download CSVNarrow it in search →With an account: the 45 studies in Atrial Fibrillation by Boehringer Ingelheim as a file.
02

Study summary

This is a comparative effectiveness and safety study of clinical events among patients taking either dabigatran or warfarin. There is no formal hypothesis to be tested, but rather to provide the estimates on the incidence of stroke and systemic embolism (effectiveness) and bleeding events (safety) using 95% confidence interval for comparison between those non0-valvular atrial fibrillation patients taking dabigatran vs. warfarin using a large, nation-wide claims data in Japan.

Read the detailed description

This is a comparative effectiveness and safety study of clinical events among patients taking either dabigatran or warfarin. There is no formal hypothesis to be tested, but rather to provide the estimates on the incidence of stroke and systemic embolism (effectiveness) and bleeding events (safety) using 95% confidence interval for comparison between those non-valvular atrial fibrillation patients taking dabigatran vs. warfarin using a large, nation-wide claims data in Japan.

03

Conditions studied

  • Atrial Fibrillation

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04

Who can participate

Ages eligible
18 Years and older
Sexes eligible
All
Accepts healthy volunteers
No
Sampling method
Non-probability sample

Study population

Any patients with atrial fibrillation contained in the Medical Data Vision (MDVI) database which is a Japanese, nationwide claims data containing approximately 16 million patients cumulatively. The data cut is between March 2011 to June 2016, and the patients in the MDV database are those who have visited DPC hospitals (diagnostic procedure combination, a lump-sum payment system based on disease diagnosis to be treated similar to Medicare/Medicaid in the USA) hospitals which provide acute in-patient, as well as outpatient care.

Go through the criteria one by one — yes, no or not sure — and take the list to your doctor or the study team. Kept in this browser only.

Inclusion criteria

  • patients aged >18 year-old with confirmed diagnosis of Non-Valvular Atrial Fibrillation (NVAF) (ICD 10 code I48)
  • having a first prescription (index date) of either dabigatran or warfarin between 14 March 2011 to 30 June 2016
  • having no prescription of any Oral Anticoagulants (OACs) for 12 months prior to the index date (this period is defined as the baseline period)

Exclusion criteria

Exclusion Criteria:

  • patients having less than 12 months of enrolment prior to the index date
  • being dialysis or kidney transplant recipients in baseline period
  • having either atrial flutter, valvular atrial fibrillation (AF)
  • mechanical valve placement, rheumatic AF
  • and/or mitral valve prolapse/regurge/stenosis in baseline period
  • having record of deep vein thrombosis or pulmonary embolism \< 6 months before AF diagnosis in baseline period
05

Study design

Observational model
Cohort
Time perspective
Retrospective
Enrollment
22,490 participants (actual)
Patient registry
No

Groups and cohorts

  • Atrial Fibrillation

    patients with atrial fibrillation

    Drug: Warfarin · Drug: Dabigatran

Interventions

  • patients treated with warfarin

  • patients treated with Dabigatran

    Also known as: PRADAXA

06

What researchers measure

Primary outcomes

  1. Incidence Rate of Stroke and Systemic Embolism (SE)

    Incidence rate of stroke and systemic embolism (SE).

    Time frame: From the index date to end of treatment with > 14 day grace period, switch to another OAC, end of continuous enrolment, end of study period or death, outcome event of stroke and systemic embolism, ie., up to 6.5 years.

Secondary outcomes

  1. Incidence Rate of Major Bleeding

    Incidence rate of major bleeding defined by any bleeding event associated with hospitalization claims and/or transfusion claims.

    Time frame: From the index date to end of treatment with > 14 day grace period, switch to another OAC, end of continuous enrolment, end of study period or death, outcome event of major bleeding, ie., up to 6.5 years.

07

Results

Posted Jul 9, 2019

Participant flow

A non-interventional study based on existing health insurance claims data. 5,146 and 13,115 patients were prescribed dabigatran and warfarin.

Participant flow — Overall Study
MilestoneDabigatranWarfarin
Started574516745
Completed514613115
Not completed5993630
Withdrew: Not eligible patients5993630

Outcome measures

PrimaryIncidence Rate of Stroke and Systemic Embolism (SE)

Incidence rate of stroke and systemic embolism (SE).

Time frame:
From the index date to end of treatment with > 14 day grace period, switch to another OAC, end of continuous enrolment, end of study period or death, outcome event of stroke and systemic embolism, ie., up to 6.5 years.
Reported as:
Number · per patient-year
Incidence Rate of Stroke and Systemic Embolism (SE)
per patient-yearDabigatranWarfarin
Incidence Rate of Stroke and Systemic Embolism (SE)2.8983.563
Statistical analysis
  • Dabigatran vs Warfarin · Hazard ratio (hr): 0.720 · 95% CI 0.534 to 0.970
SecondaryIncidence Rate of Major Bleeding

Incidence rate of major bleeding defined by any bleeding event associated with hospitalization claims and/or transfusion claims.

Time frame:
From the index date to end of treatment with > 14 day grace period, switch to another OAC, end of continuous enrolment, end of study period or death, outcome event of major bleeding, ie., up to 6.5 years.
Reported as:
Number · per patient-year
Incidence Rate of Major Bleeding
per patient-yearDabigatranWarfarin
Incidence Rate of Major Bleeding0.6391.128
Statistical analysis
  • Dabigatran vs Warfarin · Hazard ratio (hr): 0.549 · 95% CI 0.303 to 0.994

Adverse events

Non-serious events are listed at a 5% frequency threshold.

Adverse event summary by group
GroupDeathsSeriousOther
Dabigatran———
Warfarin———

Baseline characteristics

Eligible patients who were prescribed dabigatran and warfarin as the first OACs

Age, Continuous
Age, Continuous(Years)DabigatranWarfarinTotal
Mean72 ± 1078 ± 1076 ± 10
Sex: Female, Male
Sex: Female, Male(Participants)DabigatranWarfarinTotal
Female169552946989
Male3451782111272
Race and Ethnicity Not Collected
Race and Ethnicity Not Collected(Participants)DabigatranWarfarinTotal
Count of participants——0
08

Study locations

1 site
  • Nippon Boehringer Ingelheim Co., Ltd.
    Tokyo, Japan
09

References and documents

Study documents

PDFs hosted by the registry, ClinicalTrials.gov.

Individual participant data

Plan to share: No

10

Timeline

Tracking since Sep 25, 2026
ElapsedEstimatedEstimated, not yet reached

Ran from Oct 2017 to primary completion in Oct 2017, 0 months.

Results were first posted in Jul 2019, 1 year 8 months after primary completion.

How these figures are worked out, and which studies are left out of them.

Registered
Aug 17, 2017
First posted
Aug 18, 2017
StartActual
Oct 20, 2017
Primary completionActual
Oct 30, 2017
CompletionActual
Nov 3, 2017
Results first posted
Jul 9, 2019
Last update
Jul 9, 2019
What these dates mean
Start.
When the first participant enrolled; while estimated, when the study expects to open to recruitment.
Primary completion.
When the last participant was examined or treated to collect data for the study's main question, its primary outcome. A study that stopped early gives the date its data collection stopped.
Completion.
When the last participant's last visit took place, for every outcome, secondary ones and side effects included: the end of the study. Often later than primary completion, sometimes the same day.
Actual and Est.
Actual means the registry says the date has happened. Est. (estimated) is a date the sponsor plans or expects. It can still move, and the sponsor is expected to change it to actual once it has passed.
No changes since tracking began. The registry record was last updated on Jul 9, 2019, before this site started recording changes on Sep 25, 2026. Its history is on ClinicalTrials.gov ↗
11

Registry details

Key details

Study ID
NCT03254134
Responsible party
Sponsor
First posted
Aug 18, 2017
Start date
Oct 20, 2017
Primary completion
Oct 30, 2017
Completion
Nov 3, 2017
Results posted
Jul 9, 2019
Last update
Jul 9, 2019

Oversight

Data monitoring committee
No
FDA-regulated drug
Yes
FDA-regulated device
No
View the source record on ClinicalTrials.gov ↗

Not currently enrolling

This study is completed, as verified in Jul 2019. You cannot join it, but the record below documents what was studied.

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