Follow-up
Baseline electrocardiographic (ECG) and echocardiographic parameters
were acquired from the ECG and echocardiography performed nearest to the
implant date. Pacing-lead locations
were reviewed using anteroposterior, right-oblique, and left-oblique
views after implantation. PPM records were obtained at regular intervals
(at least 6 months), and the ventricular pacing burden (ventricular
pacing percentage) was obtained by telemetry at the follow-up. The
pacing QRS duration was measured within 3 days after PPM implantation
from the surface 12-lead ECG. Patients visited the outpatient department
at regular intervals (3-6 months).