Fig. 1. The potential beneficial effects of inhaled nitric oxide include mild bronchodilation, improved ventilation/perfusion ration (V/Q) matching and decreased pulmonary shunt in the lungs, decreased right ventricular pressure (RVP), decreased intracardiac shunt, increased right ventricular ejection fraction (RVEF), decreased pulmonary artery pressure (PAP) and pulmonary vascular resistance (PVR), increased cardiac output (CO), and increased arterial oxygen tension (PaO2).