Non-ventilatory events substantially contribute to rise in pulmonary arterial blood flow with early or delayed cord clamping at birth in preterm lambs.

Furthermore, the presence of a highly significant negative linear relationship between pulmonary vascular conductance and the PA backflow‐to‐inflow ratio (Fig. 5 C ) implied that an increasing vascular cross‐sectional area related to pulmonary vasodilatation and/or vascular recruitment was a major factor underlying falls in PA backflow.

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