Endocardial and epicardial focal activation pattern due to microreentry ventricular tachycardia in a patient with cardiac sarcoidosis.

Majority of ventricular tachycardias (VTs) are caused by scar-related macroreentry in patients with cardiac sarcoidosis. These VTs usually exhibit the reentry circuit on electroanatomic maps. We here describe a rare case of VT that exhibits a focal activation pattern on the electroanatomic map despite reentrant VT.