I've been told a vt ablation is very unusual. under what criteria should it be performed?

For refractory VT: Vt is a reentrant rhythm occurringusually in the region of previous scar tissue in the left ventricle (previous infarct). The primary therapy for patients with cardiomyopathy is implantation of an icd. Patients who have recurrent therapy from thier icd and unresponsive to antiarrhythmic drugs then ablation is considered. There are VT ablations performed in patients with normal hearts as well.

Vt: Not that unusual , if you have monomorphic VT requiring treatment then ablation is reasonable to cure it

Vt : By ablation is not unusual but is done often as a palliative procedure