Nsvt classification: some say 3 beats, some say 5-6. i've heard under 5 is considered a "group beat phenomenon". any electrophysiologists can weigh in? future hcp?

3 consecutive beats.: By definition, 3 consecutive ventricular beats meet the demotion of Non-sustained ventricular tachycardia.I don’t know what “group beat phenomenon “ is. I don’t also know what HCP stands for. NSVT is commonly indicative of underlying heart disease, drug toxicity, or electrolyte abnormality. This ECG abnormality is an indication for a full evaluation by a cardiologist to determine the significance