Inclusion Criteria:  Patients > 18 years of age with mono-morphic or polymorphic PVC burden of ≥5000 in 24 hours. Non-sustained VT was defined as ≥3 more consecutive beats lasting <30 seconds  Exclusion Criteria:  History of myocardial infarction, Significant flow-limiting coronary artery disease (≥50% stenosis) on invasive coronary angiography or CT angiography, History of revascularization, Significant symptomatic atrial arrhythmias associated with LV dysfunction, Severe valvular disease, Cardiomyopathy attributed to toxins such as alcohol and illicit drugs, History of cardiac arrest, History of channelopathies or inherited arrhythmias.