RV FAC
In our study, the accuracy of RV FAC was comparable with RV free wall strain in patients with mild and moderate RV dysfunction; the AUC range was from 0.62 to 0.69. RV FAC was superior to the 1-dimensional parameters, S’ and TAPSE. As a well-established 2-dimensional parameter, RV FAC has been validated in various studies and was shown to be an independent indicator of sudden death, stroke, and heart failure. A recent study indicated that RV FAC can accurately predict RVEF than 45%, with an AUC of 0.89. Potential limitations of RV FAC include lack of clear guidance in selecting the optimal view for measurements of a 3-dimensional object with complex geometric shape, and RV FAC neglects contribution of RVOT to the overall RV function.