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Figure 1 Correlation of atrial natriuretic peptide (ANP) with baseline hemodynamic parameters. Open circles = patients with PPH; closed circles = patients with NPPH. Atrial natriuretic peptide levels were from pulmonary artery samples. cGMP = pulmonary artery cyclic guanylate monophosphate concentration; CI = cardiac index; mPAP = mean pulmonary arterial pressure; mSAP = mean systemic arterial pressure; PVR = pulmonary vascular resistance; RAP = right atrial pressure; RVEF = right ventricular ejection fraction; S_vO₂ = central venous oxygen saturation.