(A) Skiagram displaying deployed Impella 2.5 into the left ventricle and ablation catheter introduced transseptally into the central zone of re-entry circuit on the interventricular septum in a patient with dilated cardiomyopathy and recurrent unstable VTs. (B) Endocardial electrograms from ablation catheter (ABL) during entrainment pacing, showing mid-diastolic fragmented potentials and concealed entrainment. This site was not identified by substrate mapping in the sinus rhythm.