Table and figure legends
Table 1. Patients and procedural characteristics. * Pulse-width=0.4ms.
AVB AV block; BMI body mass index; DAP dose area product; IVSd interventricular septum in diastole; LADplax left atrial diameter in parasternal long axis view; LBB left bundle branch; LBBB left bundle branch block; LVEF left ventricular ejection fraction; pLVAT peak left ventricular activation time; pQRSd paced QRS duration; RBBB right bundle branch block.
Figure 1. Illustration of pacing cables connected to the connector pin (cathode) and to the patient’s body (anode) for conventional interrupted implantation (A) versus pacing cables connected to the lead stylet (cathode) with the stylet fully advanced to the tip of the lead and connected to the patient’s body (anode) for continuous implantation (B).
Figure 2. Linear regression and limits of agreement between estimates of unipolar pacing impedance on connector pin vs lead stylet. CP= connector pin.
Figure 3. Connector pin and lead stylet derived unipolar his-electrograms (his-EGM), left bundle branch electrograms (LBB-EGM) and QRS morphology during pacing at final LBBAP position with nonselective (NS) and selective (S) LBBAP capture.
Figure 4. Evolution of beat-to-beat unipolar lead stylet pacing impedance values (Ω) during continuous uninterrupted implantation of the LBBAP lead. Each line represents an individual patient from the feasibility-group. LS: lead stylet.
Figure 5. Unedited continuous tracing demonstrating LS paced QRS morphology during continuous LBBAP lead implantation. Selected values of the beat-to-beat monitored unipolar pacing impedance (Ω) and pLVAT (ms) are displayed above and under the tracing. ECG speed 13mm/sec. LS: lead stylet. pLVAT: peak left ventricular activation time.