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Calculation of left atrial function index. From top to bottom: measurement of left atrial end-systolic volume (V1) and end-diastolic volume (V2) in in apical 4 and 2 chamber views, tracing left ventricular outflow tract – velocity time integral (LVOT-VTI) in apical 5 chamber view, calculation of left atrial ejection fraction, calculation of left atrial end-systolic volume index, calculation of left atrial function index
