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Figure 1 Measurement of LA volumes with transthoracic echocardiography using the modified biplane Simpson's rule. The maximum LA volume is assessed during ventricular systole in the apical two‐chamber (left panel) and apical four‐chamber (right panel) views. Maximal LA volume was 46 ml, minimal LA volume was 22 ml, resulting in an LA ejection fraction of 53%.
