Baseline characteristics
Permanent HBP or LBBP was successful in 34 of 36 patients. The average
LVEF value was dramatically low (33.76±7.54% vs. 51.77±8.19%) after
right ventricular septal pacing for 79.18 (19-321) months, and 12
patients showed elective replacement indicators (ERIs) at the latest
programming before the upgrade procedure. Permanent HBP upgrades were
successful in 29 of 34 patients, and LBBP upgrades were successful in 5
patients. Two patients failed in upgrades, and one of them died for
heart failure after 12 months follow-up. Eight patients were permanent
AF. Nine patients (26.47%) were infranodal block. The devices of CRT
were implanted in 13 (38.24%) patients. Dual-chamber pacemakers were
implanted in 20 patients (58.82%), and implantable cardioverter
defibrillator (ICD) were implanted in one patient (2.94%). The baseline
characteristics were shown in Table 1.