Fig. 6.

Summary of correlation analyses between conventional markers of pulmonary arterial hypertension severity [trans-annular plane systolic excursion (TAPSE) and brain natriuretic peptide (BNP)] and measured 4D-flow hemodynamic indices. TAPSE showed a mild but not significant trend with peak (maximum) systolic wall shear stress (WSS_max) measured in the main pulmonary artery (MPA) (A) and no relationship with viscous energy loss (E_L) measured along the MPA-right pulmonary artery (RPA) tract (B). Similarly, we did not find any relationships between the BNP levels and WSS_max (C) or between BNP and E_L (D). BNP values were natural log transformed.