Fig. 4
From: Permanent left bundle branch area pacing utilizing intracardiac echocardiogram
The paced ECG at the ideal implantation site. Left plane: the paced ECG at the ideal implantation site. During unipolar tip pacing, the paced QRS complex in lead V1 displayed a “W” morphology. Bidirectional waves were visible in one of the inferior wall leads. Right plane: baseline ECG (B) and bipolar paced ECG (P) at LBB. The baseline ECG showed a complete RBBB morphology with a QRSd of 156 ms that was corrected by bipolar LBBAP to a narrow QRSd of 116 ms. LBBAP, left bundle branch area pacing