Torsion of the human left ventricle: Experimental analysis and computational modeling

Non-invasive assessment of functional strain lines in the real human left ventricle via speckle tracking echocardiography

“…In a previous investigation using the finite element model of a human LV (Evangelista et al, 2011) we studied how to measure PSLs (Gabriele et al, , 2015. The conjecture of the possible alignment of PS lines and muscle fibers was discussed.…”

“…In all 18 individuals enrolled, echocardiographic examinations were performed by an Aplio-Artida ultrasound system (Toshiba Medical Systems Co, Tochigi, Japan). Full-volume ECG-gated 3D data sets were acquired from apical positions using a 1-4 MHz 3D matrix array transducer to visualize the entire LV in a volumetric image (Evangelista et al, 2011).…”

Activation Models for the Numerical Simulation of Cardiac Electromechanical Interactions

“…Even though several physical approximations apply, recently performed comparisons with experimental observations by Evangelista et al (2011) (in terms of torsion of the left ventricle, endocardial volumes, and circumferential strains) and by Rossi et al (2012) (in terms of end-systolic normal and shear strains) suggest the potential effectiveness of active-strain based models.…”

“…In Nardinocchi and Teresi (2007), Evangelista et al (2011) and Nobile et al (2012), the contribution of the terms depending on γ s and γ n are not included. Analogously, for some activation models (see, e.g., Göktepe and Kuhl, 2010;Rausch et al, 2011), the active tension is assumed to act exclusively along the fibers direction.…”

Strain induced shape formation in fibred cylindrical tubes

“…When the finite elasticity with distortions is used as setting for the passive and active mechanics of the cardiac tissue (Nardinocchi and Teresi, 2007;Cherubini et al, 2008;DiCarlo et al, (2009);Evangelista et al, 2011;Nobile et al, 2012;Nardinocchi et al, 2012), the fibred distortion model the muscle contraction. Of course, the geometry of the heart is very different from the cylindrical one; nevertheless, as the mechanics of the left ventricle is typically the focus of these studies and, from a topological point of view, a cylindrical tube and the ellipsoid which roughly models the left chamber are the same, a few interesting considerations may be done based on the present study.…”