Short axis view of the right [upper] and left ventricle in a patient with PAH. It can be seen important septal shift [arrows] at the beginning of diastole that added to the right ventricle enlargement contributes to an important increase in the eccentricity index (quantifying the spherical shape of the right ventricle). RV: right ventricle. LV: left ventricle. IVS: interventricular septum.