Depending upon when the cord vessels close, and the height of the newborn relative to the mother, the newborns' blood volume can increase considerably at birth. Data are shown for full-term human infants where the umbilical cord was clamped early and late (Table 3.13). Blood volume and arterial blood pressure is significantly greater in the "late" infants.
As the plasma water is eliminated, hemoconcentration of the erythrocytes results, as seen, which can produce the "polycythemia" or "hyperviscosity" syndrome (Table 3.14). Aspects of this syndrome are capillary engorgement, transudation of plasma, increased urine flow, tachycardia, tachypnea, increased stroke volume, hyperbilirubinemia, neonatal heart failure, and lowered lung compliance.
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