Journal
PRENATAL DIAGNOSIS
Volume 34, Issue 2, Pages 115-120Publisher
WILEY
DOI: 10.1002/pd.4265
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Funding
- Mexican Council of Research and Technology (Consejo Nacional de Ciencia y Tecnologia
- CONACyT) Fondo de salud [2009-01-115624]
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ObjectiveTo evaluate Doppler parameters of the two segments of the posterior cerebral artery (PCA) in normally grown and growth restricted (IUGR) fetuses. MethodsNormal reference values of the pulsatility index (PI), peak systolic velocity, end-diastolic velocity, and time-averaged maximum velocity from the two segments of the PCA (segment one, PCA-S1; segment two, PCA-S2) were constructed in 350 pregnant women from 20 to 40weeks of gestation. The association of the two PCA segments with the middle cerebral artery (MCA), and with the umbilical artery was evaluated in 50 IUGR fetuses. ResultsIn normal fetuses, Doppler parameters from PCA-S1 and PCA-S2 showed similar behavior throughout gestation. In IUGR fetuses, the PI of the two PCA segments was significantly reduced with no differences between them. PCA-S2 PI showed a higher correlation with the MCA-PI (r=0.73) than PCA-S1 PI (r=0.63; p=0.001). IUGR fetuses showed vasodilatation in the PCA earlier than in the MCA disregarding the umbilical artery-PI value. ConclusionIn IUGR fetuses, the two segments of the PCA show signs of vasodilatation earlier than the MCA. As IUGR fetuses deteriorate, the two segments of the PCA and the MCA behave similarly. (c) 2013 John Wiley & Sons, Ltd.
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