LBBAP pacing implant success
Overall implant success was 88%. Implant success in the SDL and LLL group was comparable: 20/23 (87%) versus 24/27 (89%) respectively, p=0.834. Detailed procedural characteristics for both LBBAP groups are summarized in Table 2. Screw-in attempts, lead implant depth, and total procedure and fluoroscopy times to achieve LBBAP were comparable for both groups (Table 2).
In 6 patients, LBBAP failed because of different reasons. In the LLL group LBBAP failed due to: high pacing thresholds in the left ventricular septal region related to extensive anteroseptal myocardial infarction (n=1) and previous surgical correction of a ventricular septal defect (n=1), and failed lead engagement into the septum due to right atrial enlargement (n=1). In the SDL group, LBBAP failed due to repetitive lead dislodgment after slitting the delivery sheath in a right sided subclavian implant (n=1), and failed lead engagement into the septum (n=2). In one of the latter cases, LBBAP was eventually successful with the LLL delivered through the Selectra 3D sheath as bail out.