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Mean systemic arterial pressure (panel a) and mean pulmonary blood pressure (panel b) during the first 15 min of postnatal age in control lambs (open circle) and asphyxiated term lambs ventilated with 21% O2 (gray triangle), 100% O2 (cross), and inspired oxygen (FIO2) titrated to keep the SpO2 as per Neonatal Resuscitation Program guidelines (black square). PPV, positive pressure ventilation.
