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Results As compared to Group 1, MPA of Group 2 and 3 showed larger cross-sectional area (P<0.001), decreased distensibility (P=0.001), slower flow velocity (P<0.001), faster PWV (p=0.005), with more (P<0.001) and longer duration (P=0.030) of vortex and higher PVR (P<0.001). (Table). Compared to Group 2, Group 3 had lower flow rate (P=0.002), shorter accelerative time (P=0.003) and higher PVR (P=0.018).(Table). With multiple linear regression model, we found that vortex (number and duration) and PWV of MPA predicted well of meanPAP in Group 3 (R=0.821), while only moderately in Group 2 (R=0.625). With adding the distensibility of MPA, the prediction of mean PAP improved significantly (R=0.625 to 0.978) in Group 2, while only marginally in Group 3 (R=0.821 to 0.873). Conclusions

Differential hemodynamic characteristics of high-resistance vs. high-flow type of pulmonary artery hypertension revealed by phase-contrast MRI