The MAGiC™ Cardiac Ablation European Study

Inclusion Criteria: * Adult (aged 18 or older at time of consent); * Eligible for ablation procedures of an atrial or ventricular arrhythmia per European Heart Rhythm Association (EHRA) guidelines, lctrocardiographically documented within 12 months \[rior to enrollment; * Able to be safely exposed to magnetic fields; * Willing and capable to attend scheduled follow up visits at the study site for the study duration (up to 12 months) * Willing and able to provide informed consent. Exclusion Criteria: * Unable to be safely exposed to magnetic fields due to Magnetic Resonance Imaging Unsafe device (implanted device or device that cannot be safely removed for the procedure) * Unable to remain comfortable or hemodynamically stable in the supine position for an extended period of time * Weight exceeding 200 kg (the weight limit of the table) * Women of childbearing age who are pregnant or who plan to become pregnant within the course of their participation in the study. Must have a negative pregnancy test. * Presence of intracardiac thrombus within 12 weeks prior to enrollment * Where MAGiC would need to cross a prosthetic valve * Use of MAGiC in the coronary arteries * A history of sensitivity to foreign objects or extreme allergies * Acute illness or active systemic infection * Histological or anatomical abnormalities that may lead to post-operative complications including diminished resistance to infection * Unable to receive heparin or an acceptable alternative to achieve adequate anticoagulation * Acute myocardial infarct (within the previous 6 weeks) * Recent cardiac surgery (within the previous 8 weeks) * Unstable angina at the time of enrollment * History of embolism (cerebrovascular accident, transient ischemic attack, systemic embolism) in the previous 30 days * Previous cardiac ablation within the previous 30 days * EP ablation within the previous 6 weeks. * Life expectancy \<12 months per the physician opinion. * Currently or in the 30 days prior to consent, participation in an interventional clinical trial * Significant uncontrolled or unstable medical problems which, in the opinion of the Investigator, would preclude enrollment in and completion of the study (limitation on survival). * Any reason or condition that, in the judgement of the investigator, makes the patient ineligible for the investigation.