“…Many parameters, including s', e', global longitudinal and circumferential strain, right ventricular annular velocities in systole and early diastole, end-systolic elastance, and the ratio of arterial elastance/end-systolic elastance were significantly lower both at rest and during exercise in patients with HFNEF. The usefulness of the measurement of LV longitudinal systolic function was confirmed by Wenzelburger et al 36 who found a significantly lower mitral annular plane systolic excursion (MAPSE) at rest and mainly during exercise in 62 subjects with HFNEF compared to 36 control subjects. In HFNEF patients, other authors found significantly higher exercise pulmonary vascular resistance index 37 , systemic vascular resistance index 37 , lower exercise stroke volume index and cardiac index 37,38 , greater arterial stiffening 39,40 , and reduced arteriovenous oxygen difference 41,42 .…”