Feasibility Study on the VERAFEYE System

Key Inclusion Criteria: * Subject is 18 to 80 years of age at the time of consent * Subject is scheduled to undergo a standard of care, de-novo catheter-ablation procedure to treat typical AFL or AF; or left atrial appendage (LAA)/ atrial septal defect (ASD) closure procedure * Subject is able to understand and willing to provide written informed consent Key Exclusion Criteria: * Any of the following within 6 months prior to enrolment: * Cardiac surgery including coronary artery bypass grafting, ventriculotomy, atriotomy * Thromboembolic event (stroke), transient ischemic attack (TIA) or neurological disturbances * Myocardial infarction * Any surgical or percutaneous cardiac procedure including coronary intervention and cardiac ablation * Dilated or hypertropic cardiomyopathy * Any planned surgical or endovascular intervention within 30 days before or after the ablation, or LAA/ASD closure procedure. * Any of the following cardiac conditions: * New York Heart Association (NYHA) class IV * Left ventricular ejection fraction (LVEF) \< 30% * Implanted with a cardiac rhythm management device (pacemaker, CRT, ICD, loop recorder) * Presence of intramural thrombus, tumor, or other abnormality that precludes vascular access, catheter introduction, or manipulation * Active coronary ischemia, significant valvular heart disease, or hemodynamically significant congenital cardiac abnormality * Body mass index (BMI) \> 40 kg/m2 * Body weight \< 50kg * Pregnant women or women who plan to become pregnant during the course of their participation in the study (women should either be of non- childbearing potential at the time of enrolment (as documented in the medical file) or have a negative pregnancy test within the previous 7 days prior to the ablation, or LAA/ASD closure procedure) * Life expectancy less than 12 months * Subjects who are currently enrolled in another study * Subjects with a thrombus or pericardial effusion detected in the LA/LAA during standard of care imaging