A Study Assessing Arrhythmia Mapping With the Multi-Electrode OPTRELL™ Mapping Catheter

Inclusion Criteria: * Diagnosed with and candidate for clinically-indicated catheter mapping and ablation procedure for the management of ventricular tachycardia, atrial tachycardia or atrial fibrillation (participant having undergone a previous ablation procedure may be included) * At least one episode of the targeted arrhythmia (ventricular tachycardia, atrial tachycardia or atrial fibrillation) must have been documented by electrocardiogram (ECG), Holter, loop recorder, telemetry, implanted device, or transtelephonic monitoring within 12 months of enrollment * Signed Participant Informed Consent Form (ICF). * Able and willing to comply with all pre-, post-, and follow-up testing and requirements Exclusion Criteria: * Diagnosed with an arrhythmia requiring epicardial mapping * Study arrhythmia secondary to reversible cause, or secondary to electrolyte imbalance, thyroid disease, or non-cardiac cause * Atrial arrhythmias: participants with a left atrial size greater than (\>) 55 millimeters (mm) * Left Ventricular Ejection Fraction (LVEF) less than or equal to (\<=) 25 percent (%) for Ventricular Tachycardia (VT) participants * LVEF \<= 40% for participants with atrial arrhythmia * Documented intracardiac thrombus as detected on imaging * Contraindication to anticoagulation (that is heparin, warfarin, dabigatran) * History of blood clotting or bleeding abnormalities (example hypercoagulable state) * Myocardial infarction within the past 2 months (60 days) * Documented thr…