The goal of this observational study is to investigate the changes of LBB EGM during daily activities and overdrive pacing at the time of peri-implantation and up to 6-month follow-ups of ICD/CRT-D patients. The main question it aims to answer is:
• Does the LBBP lead can provide accurate, stable, and valid EGM for ICD/CRT-D sensing and detection of ventricular tachyarrhythmia events? In each patient intracardiac EGMs of LBBP lead will be collected by ambulatory Holter monitor at the time of peri-implantation and up to 6-month follow-up. EGM collection will be collected at resting and walking conditions and overdrive pacing.
Patients aged >=18 yrs.
Patients indicated for ICD or CRT-D (primary or secondary prevention)
Patients who recently (<=30 days) received ICD/CRT-D implantation with LBBP
Patients' EGM can be digitally recorded
Patients received CIED upgrade or replacement with old pacing leads
Patients are pregnant
Patients participate in another study that will confound this study