Table 1.

Baseline clinical, echocardiographic, and hemodynamic data of the idiopathic pulmonary arterial hypertension patients

Data are presented as the mean±SD, ^*the median (interquartile range), or the percentage. Comparison between acute responders and non-responders using a ^†Mann-Whitney U test, ^‡Fisher's exact test, or ^§linear-by-linear association test. WHO, World Health Organization; LV, left ventricle; TR, tricuspid regurgitation jet; RAP, right atrial pressure; PAP, pulmonary arterial pressure; PCWP, pulmonary capillary wedge pressure; PVR, pulmonary vascular resistance; SvO₂, mixed venous oxygen saturation.