Clinical Research Directory

Inclusion Criteria: * ≥ 18 years of age to give informed consent specific to national legal requirements. * Subject with 1 of the following: 1. Symptomatic VT (despite optimal medical therapy), 3 or more episodes of VT within 24 h (VT storm). 2. At least 3 episodes of VT requiring anti-tachycardia pacing (ATP) 3. At least one appropriate ICD shock. * Referred for VT ablation by Consultant Electrophysiologist * Subject discussed at cardiac EP MDT * Suitable candidate for intra-cardiac mapping and ablation of arrhythmia. * Subject agrees to comply with study procedures and be available for routine follow up visits for at least 12 months after enrolment. * Subject is willing and able to provide written consent Exclusion Criteria: * BMI \>40kg/m2 * Presence of intramural thrombus, tumour or abnormality that precludes vascular access, catheter introduction or manipulations. * Coagulopathy, bleeding diathesis or suspected pro-coagulant state. * Sepsis, active systemic infection or fever (\>100.5 F/38 C) within a week prior to the ablation procedure. * Significant restrictive or obstructive pulmonary disease or chronic respiratory condition. * Renal failure requiring dialysis or renal compromise that in the investigators judgement would increase risk to the subject or deem the subject inappropriate to participate in the study. * Known allergies or intolerance to anticoagulant and antiplatelet therapies to be used in conjunction with the study or contrast sensitivity that can't be adequately pre-treated prior to the ablation procedure. * Positive pregnancy test results for female subjects of childbearing or potential or breast feeding. * Enrolment in a concurrent clinical study that in the judgement of the investigator would increase risk to the subject or deem the subject inappropriate to participate in the study. * Significant GI bleed.