Significant dependency of left atrial strain on left ventricular longitudinal motion.

Background: The effects of left ventricular longitudinal function on the left atrial strain, including the left atrial reservoir function, have not been adequately quantified.

Methods: A total of 124 patients who underwent echocardiography were enrolled in this study. Left atrial strain analysis was performed using two-dimensional speckle tracking echocardiography, and the left atrial volume was derived using the modified Simpson's method.

Importance of left ventricular contraction for left atrial reservoir function.

Background: The determinants of left atrial (LA) reservoir function have not been clarified.

Methods: To elucidate the effect of left ventricular (LV) contraction on LA reservoir volume (ΔV), volume change due to mitral annular downward motion and aortic root anterior motion, which are related to LV contraction during systole, was calculated in 72 consecutive subjects [42 patients without any cardiac disease (control group), 13 patients with heart failure with reduced ejection fraction (HFrEF group) and 17 with preserved ejection fraction (HFpEF group)]. LA volume was calculated using the modified Simpson's method of bi-plane 2-D echocardiograms.