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Associations between peak (maximum) systolic wall shear stress (WSSmax) and the primary determinants of WSS, vessel diameter (A) and peak flow velocity (B), measured in the main pulmonary artery (MPA). Both correlations obeyed the relationship between WSS, vessel size, and flow velocity as dictated by steady-state Haagen-Poisseuille equation. C: positive correlation existed between the relative area change (RAC) and WSSmax. PAH, pulmonary arterial hypertension.
