Abstract
Reversed blood flow has been reported in the superior mesenteric artery (SMA) in 92% of healthy term newborns at 2h of age. By 24h after birth the end-diastolic velocity became positive in all of the infants. To characterize hemodynamic changes in the coeliac artery and superior mesenteric artery in healthy term newborns during the first 6h after birth and to specify the time interval when the negative values of end-diastolic velocity in the superior mesenteric artery become positive. Our study included 30 healthy term newborns. The blood flow velocity was assessed by Doppler ultrasonography at 2h, 4h and 6h after birth. The end-diastolic velocity in the superior mesenteric artery changed from negative values at the age of 2h (-0.9cm/s, range -13.2 to 0.0) to positive (7.08cm/s, range 6.3 to 13.5, P < 0.001) at 6h after birth. In the coeliac artery, the end-diastolic velocity increased during this period, but negative values were not observed (11.8cm/s, range 9.3 to 13.9 at 2h and 18.03cm/s, range 14.2 to 27.6 at 6h). Important changes occur in splanchnic circulation during the first 6h after birth. The rise in end-diastolic velocity in the superior mesenteric artery from negative to positive values in 83% of healthy term newborns is the most important change.
Published Version
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