Figure 1.

Association of abnormal electrocardiogram (ECG) markers with left ventricular ejection fraction (LVEF). Among all patients (n = 9,742), ≥1 conventional abnormal ECG marker was present in 44% of patients with LVEF ≤35% (in dark blue). Among patients without conventional ECG abnormalities, an additional 21% of patients with LVEF ≤35% had ≥4 abnormal markers on the expanded ECG panel (in cross‐hatch). Use of the expanded panel plus conventional markers increased identification of abnormal ECG findings from 44% to 65% among patients with LVEF ≤35%. Conventional ECG abnormalities were left bundle branch, atrial fibrillation/flutter, or paced rhythms. The expanded abnormal ECG panel included resting heart rate >85 bpm, QRS duration >110 ms, QTc interval ≥460 ms for men and ≥470 ms for women, delayed QRS transition zone, delayed intrinsicoid deflection, and QRS‐T angle >90°