PO-03-079 HIS-BUNDLE PACEMAKER IMPLANTATION IN PEDIATRICS: SIGNIFICANT ISSUES DURING SHORT-TERM FOLLOW-UP

In patients with AV-block (AVB), His bundle pacing (HBP) allows physiological ventricular depolarisation and may prevent pacemaker-induced cardiomyopathy. Selective non-selective HBP is a feasible procedure in pediatric without congenital heart disease (CHD). Data on implantation follow-up after HBP-implantation special reference to time course of electrode parameters limited young HPB. We analyzed the short-term < 18 years age HIS-Bundle pacemaker (HIS-PM). were collected from all who underwent HIS-PM at 2 centers. interrogation as well 4 weeks, 3, 6, 12 months PM-Implantation analyzed, respectively. Since 10/2020, 10 (8 females) complete AVB (congenital: n=9, acquired surgical VSD closure: n=1) implantation. Median was 13.5 (range 8.2-17.1) years, median body weight 56.0 32.1-94.0) kg. duration implant procedures 146 99-320) minutes, fluoroscopy 13.4 3.37-29.6) X-ray-dosage 3420 780-9060) mGycm2, Due high thresholds (> 3.5V @ 1ms) during procedure, despite extensive search for optimal location HIS-electrode, could not be realized AVB. These received conventional dual chamber achieved remaining patients. During 7.8 3.8-12.9), HIS-electrode threshold increased significantly 0.9 V (p=0.046) significant changes HIS impedance. Up now, 3/8 (37.5%) systems had revised due infection 2.6 (n=1), 3,75 1,5 ms dislocation Atrial remained unchanged since period, issues became evident considerable portion Although data still limited, these findings limit further use