Observe the Safety and Effectiveness of the WATCHMAN FLX™ for Subjects in Hong Kong

Inclusion Criteria: 1. Patients who are eligible for a WATCHMAN FLX device according to current international and local guidelines (and future revisions) and per physician discretion; 2. Patients who are willing and capable of providing informed consent, participating in all testing associated with this clinical investigation at an approved clinical investigational center; 3. Patients whose age is 18 years or above, or of legal age to give informed consent specific to state and national law. Exclusion Criteria: 1. Patients who are currently enrolled in another investigational study or registry that would directly interfere with the current study, except when the patient is participating in a mandatory governmental registry, or a purely observational registry with no associated treatments. Each instance should be brought to the attention of the sponsor to determine eligibility. 2. Women of childbearing potential who are, or plan to become, pregnant during the time of the study (method of assessment upon physician's discretion); 3. The subject is unable or not willing to complete follow-up visits and examination for the duration of the study.