{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,6,26]],"date-time":"2026-06-26T02:52:05Z","timestamp":1782442325468,"version":"3.54.5"},"reference-count":28,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2012,6,8]],"date-time":"2012-06-08T00:00:00Z","timestamp":1339113600000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["obgyn.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Ultrasound in Obstet &amp; Gyne"],"published-print":{"date-parts":[[2012,7]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Objective<\/jats:title><jats:p>We sought to determine whether the presence or absence of aortic obstruction impacts cerebrovascular resistance in fetuses with single\u2010ventricle (SV) congenital heart disease (CHD).<\/jats:p><\/jats:sec><jats:sec><jats:title>Methods<\/jats:title><jats:p>Pulsatility indices (PIs) were recorded for the middle cerebral artery (MCA) and the umbilical artery (UA) from 18 to 40 weeks' gestation in 59 fetuses (163 examinations) with SV\u2010CHD with unobstructed aortic flow, yet decreased pulmonary flow, in 72 fetuses (170 examinations) with obstructed aortic flow and hypoplastic left heart syndrome (HLHS) and in 92 normal fetuses (92 examinations). The cerebral\u2010to\u2010placental resistance (CPR) was calculated as the MCA\u2010PI\/UA\u2010PI. <jats:italic>Z<\/jats:italic>\u2010scores were generated for the MCA\u2010PI and the UA\u2010PI in order to make comparisons independent of gestational age. Statistical analyses were performed using one\u2010way ANOVA with post\u2010hoc testing. Trends in these variables over the course of gestation were assessed using linear regression and univariate ANOVA.<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The MCA\u2010PI and the CPR were significantly lower in SV fetuses with aortic obstruction compared with SV fetuses with pulmonary obstruction and with normal fetuses. Moreover, the MCA\u2010PI decreased significantly for SV fetuses with aortic obstruction over the course of gestation. In contrast, the MCA\u2010PI was higher over the course of gestation in SV fetuses with pulmonary obstruction compared with normal fetuses.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>In fetuses with SV\u2010CHD, cerebrovascular resistance varies substantially between fetuses with and without aortic obstruction. Compared with normal fetuses, cerebrovascular resistance is decreased in SV fetuses with aortic obstruction, yet increased in SV fetuses with pulmonary obstruction. In fetuses with SV physiology, inherent differences in cerebral blood flow may underlie postnatal neurodevelopmental outcomes. Copyright \u00a9 2012 ISUOG. 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