Fig. 3

Bull’s-eye maps showing regional longitudinal strain in LBBB patients with (a) and without (b) subclinical LVSD, and ROC analysis of ECG variables for identifying subclinical LVSD in LBBBpEF. (c) Abbreviations: LVSD left ventricle systolic dysfunction, LBBB left bundle branch block, QRS QRS duration, QS Presence of QS in lead V1, Dis-T T-wave orientation discordant with QRS complex in leads I, V5, and V6