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Proposed placental hemodynamics in normals and examples of pre-, intra-, and post-placental causes of impaired oxygen transport. Reference values from animal and human literature included where available with unknown values indicated as “?”. Q, flow; SaO2, oxygen saturation; Hb, hemoglobin concentration; UtA, uterine arteries; UtV, uterine veins; UA, umbilical arteries; UV, umbilical vein.
