Variation in carotid blood flow (Qca, panel a) and pulmonary blood flow (Qp, panel b) in 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 maintain preductal SpO2 as per Neonatal Resuscitation Program guidelines (black square). *P <0.05 by ANOVA (21% asphyxiated and controls significantly lower than variable FIO2 asphyxia by Bonferroni post hoc test). PPV, positive pressure ventilation.