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Changes in oxygen and carbon dioxide in umbilical cord arterial blood before and after the first breath of a newborn to explore the mechanisms of respiratory regulation

The fetus has no actual respiration, and the newborn begins to breathe after birth. We assume that the first breath dominantly generated by hypoxia. In this study, the changes and lowest limit of blood oxygen partial pressure of umbilical artery (PuaO2) after chemoreceptor were analyzed to explore the mechanism of neonatal spontaneous breathing.