Strain and strain rate were significantly associated with active FAC (p2 adj =0.76 and p2 adj =0.77), passive FAC (p=0.016, R 2 adj =0.55 and p=0.016, R 2 adj =0.55), LAA max (p2 adj =0.85 and p2 adj =0.88), and LAD max (p2 adj =0.83 and p2 adj =0.85), with lower S L and SR L in larger atria.