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Figure 1: Fetal echocardiogram before maternal oxygen therapy. (a) Color Doppler demonstrating severe tricuspid valve regurgitation (TR, annotated by the white arrow). RA: Right atrium, RV: Right ventricle, (b) Spectral Doppler noting continuous pulmonary regurgitation. (c) Color Doppler of reverse flow (left-to-right) in the patent ductus arteriosus (PDA). Ao: Aorta

Figure 1: Fetal echocardiogram before maternal oxygen therapy. (a) Color Doppler demonstrating severe tricuspid valve regurgitation (TR, annotated by the white arrow). RA: Right atrium, RV: Right ventricle, (b) Spectral Doppler noting continuous pulmonary regurgitation. (c) Color Doppler of reverse flow (left-to-right) in the patent ductus arteriosus (PDA). Ao: Aorta