In recent years, the importance of quantifying atrial function and volumes in cardiomyopathies for diagnostic and prognostic purposes has been increasingly recognized. Left atrial (LA) size, volume, and functional parameters are linked to adverse clinical outcomes in cardiomyopathy patients [1,2,3]. However, LA contraction follows a complex sequence, which is not sufficiently described by volumes and conventional functional parameters alone [1,4]. LA contraction can be divided into three phases:…