AP19-00648 Abstract View

Result : A total of 94 patients with the native QRS duration of 167.2±17.2 ms were included. In 92 patients, iLCSP was achieved and demonstrated RBBB pattern with the paced QRS duration of 116.4±12.6ms (Figure 1B, middle panel). Fusion of iLCSP and native conduction via the RBB eliminated RBBB and resulted in an average QRS duration of 103.2±10.1 ms (Figure 1C). In a subgroup that underwent a two-lead implantation technique (n=21), a Purkinje pre-potential was recorded during His corrective pacing from the intraseptal lead (Figure 1B, right panel). Output dependent selective and non-selective iLCSP were demonstrated in 52% patients, with the same stimulus to peak left ventricular activation time of 82ms (Figure 1B, left and middle panel). Lead parameters remained stable at 1-year (threshold 0.61±0.17V/0.5ms, R wave 13±5.8mV, Figure 1D, E). During follow-up, only one patient had an increase in LBB capture threshold to 2.5V/0.5ms and there were no other complications such as dislodgment, infections, embolism or stroke associated with the implantation.