Data collection
Baseline patient characteristics, ECG features and pacing indications
were collected. Pacing thresholds, R-wave sensing amplitudes and lead
impedances were measured both during uni- and bipolar pacing at implant
and follow-up. Paced QRS morphology and duration were measured from
stimulus to end-QRS. The stimulus to peak LVAT was measured from pacing
stimulus to peak of the R wave in leads V5-V6 during LBBAP. Number of
screw-in attempts, procedural and fluoroscopy times and acute
procedure-related complications were recorded. All patients underwent
post-procedural transthoracic echocardiographic evaluation to assess
potential LBBAP implant-related complications.