Figure legends:
Figure 1 . A: The excitation signal was delayed in the key isthmus (white solid line). The excitation signal was transmitted along the first side of the isthmus (white dotted line); B: Two reentries, key isthmus (red dots pointed by yellow arrow) and all delayed potentials in the interior and edge of LVA were ablated to disappear by unipolar RFCA; C: Using unipolar RFCA to isolated LVA anatomically (red dots).
Figure 2 . A: CARTO-mapped ventricular tachycardia (VT) reentrant circuit and key isthmus (red arrow); B: Eight radiofrequency ablation lines were performed on the LVA using a bipolar RFCA, with one passing through the key isthmus of the reentrant circuit (yellow arrow); C: The reentrant loop area and bipolar RFCA line through the key isthmus of the reentrant circuit (yellow arrow); D: After bipolar RFCA, LVA was performed for linear closure.