Abstract 12072: Left Atrial Contractile Function is Independent of Left Ventricular Mechanics Regardless of Modalities

IntroductionLeft atrial (LA) strain is a quantitative functional parameter of LA function with diagnostic and prognostic value. However, because LA function reflects underlying LV longitudinal function, it may merely reflect the change in LV deformation. The aim of this study was to test our hypothesis that LA reservoir strain, but not LA contractile strain, is independently associated with LV global longitudinal strain (LVGLS) in both echo and MRI strains.MethodsMedically controlled hypertensive adults who had both echo and MRI were used. Strain analyses were performed on 2CH and 4CH views and conducted using dedicated software. The association between LA reservoir, pump and conduit strain, as well as LVGLS and other LV standard parameters were assessed in both univariable and multivariable linear regression models.ResultsThe participants (n=68, 51.5% male, 56±9.3 years) had normal LVEF (60.6±0.8). In univariable models using MRI and Echo strains, LVGLS was associated with LA reservoir (Echoβ= 0.44, P