Fig. 2From: A method for calculating left ventricular ejection fraction noninvasively from left ventricular arterial coupling (Ees/Ea)A: Correlation between EFecho and EFeff. The correlation coefficient (r) was 0.47. (R2 = 0.219, p < 0.05) B: Bland-Altman plot between EFecho and EFeff demonstrating a bias of 8.5 ± 8.0%. The solid line shows the bias and the dotted line represents ± 2SD.Back to article page