Newborns with a Congenital Heart Defect and Diastolic Steal Have an Altered Cerebral Arterial Doppler Profile

Abstract

Objectives: To compare trends in the anterior cerebral artery (ACA) Doppler markers of vascular flow for neonates with a congenital heart defect (CHD) with and without diastolic systemic steal during the first 7 days of life. Methods: Prospective study recruiting newborns (≥35 weeks of gestation) with a CHD. Doppler ultrasound and echocardiography were performed daily from day 1 to 7. The cohort was divided into the presence/absence of holo-diastolic retrograde flow in the postductal aorta (“retrograde”) on the last-available echocardiogram. Data extractors were masked to retrograde status. Mixed effect models (random slope/intercept) were constructed using RStudio. Results: We enrolled 38 neonates with CHD. Retrograde aortic flow was present on the last echocardiogram in 23 (61%). Peak systolic velocity and mean velocity increased significantly over time, independent of retrograde status. However, having a “retrograde” flow status conferred a significant decrease over time of their ACA–end-diastolic velocity (β = –5.75 cm/s, 95% CI −8.38 to −3.12, P < .001, when compared with the nonretrograde group), and a significant increase in the ACA resistive (β = 0.16, 95% CI 0.10-0.22, P < .001) and pulsatility (β = 0.49, 95% CI 0.28-0.69, P < .001) indexes. No subject presented retrograde diastolic flow in the ACA. Conclusions: In neonates with CHD in the first week of life, infants with echocardiographic signs of systemic diastolic steal within the pulmonary circulation have Doppler signs of cerebrovascular steal in the ACA.