Methodological discordance between apical four-chamber and biplane Simpson's method for left ventricular ejection fraction: a retrospective study of a credentialed echocardiographic dataset
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Background: Left ventricular ejection fraction (LVEF) remains central to heart failure phenotyping and device-based decision-making, yet the degree to which apical four-chamber (A4C) and biplane Simpson measurements diverge at cl... ...
