Cerebral fractional tissue oxygen extraction (cFTOE) during immediate fetal-to-neonatal transition: a systematic qualitative review of the literature.

Several explanations were listed: (i) infants with higher pCO 2 levels showed a trend to lower SpO 2 and pO 2 , resulting in reduced oxygen delivery to the brain and increased oxygen extraction; (ii) the vasodilatory effect of pCO 2 might not outweigh the vasoconstrictive effect of rising pO 2 levels in preterm infants; (iii) preterm infants showed higher fetal haemoglobin (HbF) val

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