Figure 1. Differences of resting hemodynamic in upright (45°) vs supine position in patients undergoing right heart catheterization because of suspected pulmonary hypertension.

Mean differences with 95% CIs of main resting hemodynamic measures assessed by right heart catheterization in upright vs supine position within patients of the entire main cohort (all groups together) and within patients of the different hemodynamic subgroups. Differences are negative if values in upright position are lower than in supine position. Cardiac index, L/min per m²; mPAP, mean pulmonary artery pressure, mm Hg; PAWP, pulmonary artery wedge pressure, mm Hg; PH, pulmonary hypertension; and PVR, pulmonary vascular resistance.