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Figure 1 Pulmonary vascular resistance (PVR) (mean ± SE) differed across the four study conditions in group 1 (p < 0.0001); PVR was lower in oxygen (O2) compared with room air (RA) (*) and was lower in nitric oxide in RA (NO+RA) compared with RA ( ) (p < 0.05 for both).
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