PMC9681806_01
During the entire screw-in process, the COI amplitude increased and then decreased gradually after reaching the peak, followed by a small but significant abrupt decrease. COI, current of injury; ECG, electrocardiogram; EGM, intracardiac electrogram.
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F1
During the entire screw-in process, the COI amplitude increased, peaked, and gradually decreased, followed by a small but significant abrupt decrease (Figure 1).
After the COI amplitude increased to its highest value, the electrode was rotated very slowly to avoid a sudden drop in COI until the LBB area was reached. An abrupt shortening of V6RWPT, discrete EGM and fixation beat were observed. COI, current of injury; LBB, left bundle branch; LBBP, left bundle branch pacing; SLBBP, selective left bundle branch pacing; NSLBBP, non-selective left bundle branch pacing; ECG, electrocardiogram; EGM, intracardiac electrogram; RWPT, R-wave peak time; PVC, premature ventricular complex.
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F2
An abrupt shortening of the V6 R-wave peak time (V6RWPT) and a discrete EGM were subsequently observed (Figure 2), indicating LBB capture.