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The calculation of left ventricular ejection fraction. Left ventricular ejection fraction was calculated using the biplane Simpson method. See text for details. A, The apical 4‐chamber views at the end of diastole (left panel) and systole (right panel). B, The apical 2‐chamber views at the end of diastole (left panel) and systole (right panel). BPM indicates beats per minute.
