Edoxaban vs. Warfarin in Subjects Undergoing Cardioversion of Nonvalvular Atrial Fibrillation (NVAF)

The purpose of this study is to compare edoxaban (investigational drug) with warfarin and
enoxaparin, to see if it is safe and effective in preventing stroke and other blood clot
complications in subjects with atrial fibrillation whose doctors plan to treat them with an
electrical cardioversion. It is expected that 284 sites will recruit 2200 subjects from North
America, EU, Russia, Ukraine and Israel. Participants will be randomly allocated to receive
either treatment with edoxaban, or treatment with warfarin, plus enoxaparin if required.
Participants will have an equal chance of receiving either treatment. Participants will be in
the study for a maximum of 82 days. Study procedures will include physical examinations,
vital signs (pulse and sitting blood pressure), ECG (electrocardiogram), finger prick blood
clotting tests, blood samples and urine samples.

The study is expected to show that edoxaban will provide comparable incidence rates to
warfarin plus enoxaparin, the current standard treatment for both efficacy and bleeding.

Inclusion Criteria:

- Has signed informed consent

- Is older than minimum legal adult age (country specific)

- Has had ongoing AF lasting at least 48 hrs but <= 12 months (with or without valvular
heart disease)

- Has treatment plan that includes for electrical cardioversion

- Has NVAF or other specific valvular heart diseases (eg, mitral valve prolapse, mitral
valve regurgitation, and aortic valve disease)

Exclusion Criteria:

- Has AF that is transient or reversible

- Has contraindicated condition, ie, conditions considered to be formal indication for
conventional anticoagulation

- Has a history of left atrial appendage (LAA) closure

- Has a known thrombus in LAA, the left atrial, left ventricle or aorta - or an
intracardial mass

- Has had myocardial infarction (MI), stroke, acute coronary syndrome (ACS), or
percutaneous coronary intervention (PCI) within the past 30 days

- Has any contraindication to anticoagulant agents

- Has had protocol-defined signs of bleeding or conditions associated with high risk of
bleeding that would preclude participation

- Is receiving, or plans to receive during the study period, dual antiplatelet therapy
(DAPT) or invasive procedures (other than routine endoscopy) in which bleeding would
be anticipated

- Has received prohibited concomitant medication or therapy

- Has had protocol-defined signs of bleeding or high

- Has inadequate liver, kidney, and blood test results

- Received any investigational drug or device within the past 30 days or plans to during
the study period

- Has reproductive potential and does not agree to take proper contraceptive measures

- Has active cancer requiring chemotherapy/radiation/major surgery within the next 3
months

- Has significant active concurrent medical illness or infection or life expectancy less
than 6 months

- In the opinion of the investigator, is unlikely to comply with the protocol or
complete the study, has had drug or alcohol dependence within the past year, or has
any other condition that might place the participant at increased risk of harm

- Is a participant in the United States after January 2015 with creatinine clearance
(CrCL) greater than 95 mL/minute