This study is a multi-center (Sinchon Severance hospital / Gangnam Severance hospital), prospective cohort observational study to patients who had undergone structural heart intervention including device closure for secundum type atrial septal defect or Patent foramen ovale. Transthoracic echocardiography will be performed before the procedure, immediately after, and at 6, 18, 30 months after the procedure. Wearable ECG monitoring (> 3 days) will be performed before the procedure or immediately after procedure. Demographic, laboratory, hemodynamic data during procedure, and non-invasive imaging dat are obtained.

Inclusion Criteria:

• Adult ≥ 19 year-old
• Patients who scheduled to perform percutaneous device closure for atrial septal defect or patent foramen ovale
• Patients provided with the written, informed consent to participate in this study

Exclusion Criteria:

• Patients who had paroxysmal, persistent, or chronic AF
• Life expectancy < 12 months
• Subject who the investigator deems inappropriate to participate in this study

Patients who scheduled to perform percutaneous device closure for atrial septal defect or patent foramen ovale