Later Development, Develop. Physiol., Dr. D. Penney
Table 3.14 - Placental Transfusion and the Hyperviscosity (Polycythemia) Syndrome.
- Placenta contains 125 ml blood, 33% of total blood volume.
- 75 ml/kg is transferred to infant during 1st 30 sec. post-delivery
- Placental separation may be impeded by immediate cord clamping.
- If fetal blood volume was adequate in utero, why not afterward? Why should placental blood volume be added? To fill expanding lungs?
- May be used to correct fetal anemia; however load could overload cardiovascular system.
- Requires: gravity, external mechanical force (milking), uterine contraction.
- Blood volume peaks, plasma and water redistribute to extravascular space, resulting in reduced blood volume and hemoconcentration.
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