2.1 Inclusion and exclusion criteria
This study collected the imaging information and data from inpatients
who underwent the LBBAP procedure and CAG in the Center of
Cardiovascular Medicine, the Second Affiliated Hospital of Nanchang
University between January 1, 2019 and October 1, 2020. The exclusion
criterion was patients with one or more of the following diseases: a)
acute myocardial infarction; b)intracoronary stenting; c) chronic
occlusive disease of the coronary arteries. This study was approved by
the local ethical board and was performed in accordance with the
Declaration of Helsinki.