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Using high-fidelity micromanometers and flow velocity sensors at right heart catheterization, we compared pulmonary hemodynamics and wave reflections in age-matched normal adults and those with atrial septal defects, separated into three subgroups based on levels of mean pulmonary artery pressure low ( 26 mmHg). We made baseline measurements in all groups and after intravenous sodium nitroprusside in the subgroups. All the subgroups had higher than normal baseline pulmonary flows and corresponding power - which did not differ among the