successful left atrial appendage occlusion with Amulet device within 37 days prior to randomization.
treatment with dual antiplatelet therapy (clopidogrel and acetylsalicylic acid) between left atrial appendage closure and randomization
participant's age 18 years or older at the time of signing the informed consent form
participant is willing to follow all study procedures; especially randomized antiplatelet treatment regimen and follow-up visits with transesophageal echocardiography when applicable
participant is willing to sign the study informed consent form

NCT03445949_inc_T1
Procedure
left atrial appendage occlusion
NCT03445949_inc_T2
Qualifier
successful
NCT03445949_inc_T3
Device
Amulet device
NCT03445949_inc_T4
Temporal
within 37 days prior to randomization
NCT03445949_inc_T5
Procedure
dual antiplatelet therapy
NCT03445949_inc_T6
Drug
clopidogrel
NCT03445949_inc_T7
Drug
acetylsalicylic acid
NCT03445949_inc_T8
Scope
clopidogrel and acetylsalicylic acid
NCT03445949_inc_T9
Procedure
left atrial appendage closure
NCT03445949_inc_T10
Temporal
between left atrial appendage closure and randomization
NCT03445949_inc_T11
Reference_point
randomization
NCT03445949_inc_T12
Reference_point
left atrial appendage closure
NCT03445949_inc_T13
Scope
left atrial appendage closure and randomization
NCT03445949_inc_T14
Person
age
NCT03445949_inc_T15
Value
18 years or older
NCT03445949_inc_T16
Temporal
at the time of signing the informed consent form
NCT03445949_inc_T17
Reference_point
signing the informed consent form