“…Measurement of tricuspid annular plane systolic excursion (TAPSE) by M-mode echocardiography has long been considered as the simplest, yet the most reliable, indicator of RV dysfunction. Importantly, impaired RV function by TAPSE measurement is common in patients with HFrEF, being found in 35% to 50% of cases, 1,2,4,5 in whom it represents an independent marker of poor prognosis, either when used alone 1,[3][4][5] or combined with pulmonary artery systolic pressure, as an indicator of RV-to-pulmonary circulation coupling. 2 Recently, 2-dimensional (2D) strain imaging technique, such as speckle-tracking echocardiography (STE), has allowed cardiologists to investigate myocardial mechanics easily and with greater accuracy, being relatively angle independent.…”