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Figure 1 (A to D) Correlation of resting hemodynamic parameters with brain natriuretic peptide (BNP) levels in primary pulmonary hypertension (PPH). (A) Pulmonary vascular resistance (PVR) vs. BNP; r = 0.61; p = 0.001; (B) mean pulmonary artery pressure (PAP) vs. BNP; r = 0.49; p = 0.01; (C) right atrial pressure (RAP) vs. BNP; r = 0.78; p < 0.001; (D) cardiac index (CI) vs. BNP; r = –0.48; p < 0.05.