Inclusion Criteria:  Male or female 18 years of age or older. Currently scheduled for the ablation of an atrial arrhythmia utilizing the diagnostic AcQMap 2.1 System. Willing and able to give written informed consent.  Exclusion Criteria:  In the opinion of the investigator, any contraindication to the planned ablation, including anticoagulation contraindications, atrial thrombus, renal failure, or sepsis. Current enrollment in any study protocol sponsored by Acutus Medical Any other condition that, in the judgment of the investigator, makes the participant a poor candidate for this procedure, the study, or compliance with the protocol (includes vulnerable patient population, mental illness, addictive disease, extensive travel away from the research center, etc.).