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- W2895869668 abstract "Resting state, room air (RA) fetal Doppler echocardiography provides information concerning blood flow characteristics in congenital heart disease (CHD). Maternal hyperoxygenation (MH) may provide additional information by testing for reactivity of fetal vascular beds in a variety of conditions. Following completion of standard RA Doppler echocardiography, women carrying a fetus with CHD underwent 10 minutes of MH with 60% Fi02 via non-re-breather face mask, at which point repeat fetal Doppler echocardiography was performed. Vascular resistances in the placenta, brain and pulmonary circulations where assessed through calculation of pulsatility indices (PI) in umbilical artery (UA), middle cerebral artery (MCA), distal pulmonary artery (dPA) and ductus arteriosus (DA). Comparison was made between RA and MH PI values using paired t-test. 182 patients underwent MH at mean gestational age 35.5±2.4 wks. 114 had HLHS (63%) with the others having conditions such as coarctation of the aorta with borderline small left ventricle, transposition of the great arteries, restrictive foramen ovale with atrial aneurysm, and obstructed pulmonary venous return. In HLHS, compared to RA, MH led to no change in placental resistance (UA PI), but an increase in cerebral resistance (MCA PI 1.52±0.36 versus 1.59±0.36, p=0.02), decrease in pulmonary resistance (dPA PI 4.38±1.4 versus 3.46±1.2, p<0.001) and increase in DA PI (2.82±0.39 versus 3.04±0.47, p< 0.01). The increase in DA PI was related to a decrease in DA diastolic and mean velocities, consistent with increased DA retrograde flow, and vasodilation of the pulmonary circulation to MH. There were no findings of ductal constriction or change in ventricular performance during MH. MH is a safe means for provocative testing during fetal life that provides information concerning the vasoreactivity of circulatory beds. Characterising normal and abnormal responses in a variety of conditions at various gestational ages may yield insight into the pathophysiology of various forms of CHD." @default.
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- W2895869668 date "2018-10-01" @default.
- W2895869668 modified "2023-09-24" @default.
- W2895869668 title "OC13.03: Maternal hyperoxygenation during fetal Doppler echocardiography provides physiological insight in congenital heart disease" @default.
- W2895869668 doi "https://doi.org/10.1002/uog.19291" @default.
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