Effect of body position and ventilation on umbilical artery and venous blood flows during delayed umbilical cord clamping in preterm lambs.

Although this failed to reach statistical significance, the increase occurred in all lambs, is likely to be physiologically relevant and probably resulted from an increase in afterload caused by gravity-induced increase in umbilical artery pressure.

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In below lambs, mean CaBF ( figure 4 A) and end-diastolic CaBF tended to increase by 19.2±8.9 and 21.6±6.4 mL/min/kg (p=0.081), respectively, but these did not reach statistical significance.

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