Figure 1.

Left Atrial Strain Measurements in Patients With and Without Development of Atrial Fibrillation Among the Total Cohort and Subgroups (With and Without Cardiac Amyloid Involvement)

(A) Differences in TPSRI; (B) Differences in reservoir ratio; (C) Differences in $\epsilon$R; (D) Differences in total LA stroke volume index. Values represent adjusted mean and SE, after accounting for age, history of atrial fibrillation, and diastolic dysfunction. $\epsilon$R = left atrial reservoir strain (peak left atrial longitudinal strain during ventricular systole); LA = left atrial; SE = standard error; TPSRI = time-to-peak strain rate indexed to R-R interval (reservoir ratio represents TPSRi/$\epsilon$R).