Key result
Progression through the second half of pregnancy was associated with a decrease in the pulsatility index in the umbilical artery and its ratio to the internal carotid artery.
Observational (n=30)
The study demonstrates a physiological decrease in the pulsatility index of the umbilical artery and the umbilical-to-internal carotid artery ratio during the second half of normal pregnancy.
A longitudinal study was carried out on 30 healthy fetuses in order to assess the modifications of fetal blood flow throughout pregnancy. The pulsatility index was evaluated at two-week intervals by means of pulsed Doppler equipment. In the umbilical artery measurements were performed from 20 weeks onwards, whereas in the descending aorta and internal carotid artery analysis started from 26 weeks onwards. A decrease of the pulsatility index in umbilical artery and in the ratio between the pulsatility indexes in umbilical artery and internal carotid artery was found over the second half of pregnancy.
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Arduini et al. (1987) conducted an observational in Healthy fetuses (n=30). Pregnancy progression was evaluated on Pulsatility index in umbilical artery, descending aorta, and internal carotid artery. Progression through the second half of pregnancy was associated with a decrease in the pulsatility index in the umbilical artery and its ratio to the internal carotid artery.
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