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Figure 3: Fetal echocardiogram before and after maternal oxygen therapy for 30 min. (a) Increase in pulmonary artery forward (above baseline): Reverse (below baseline) velocity time integral ratio from 3.9 to 5.2. (b) Increase in pulmonary venous velocity time integral from 0.05 m to 0.14 m. (c) Acute decrease in middle cerebral artery pulsatility index from 3.1 to 1.7 attributed to ductus arteriosus constriction

Figure 3: Fetal echocardiogram before and after maternal oxygen therapy for 30 min. (a) Increase in pulmonary artery forward (above baseline): Reverse (below baseline) velocity time integral ratio from 3.9 to 5.2. (b) Increase in pulmonary venous velocity time integral from 0.05 m to 0.14 m. (c) Acute decrease in middle cerebral artery pulsatility index from 3.1 to 1.7 attributed to ductus arteriosus constriction