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Hyperviscosity - newborn
Definition:
Hyperviscosity is when blood flow is slowed and blocked because there are too many red blood cells in an infant's blood. Alternative Names:
Neonatal polycythemia
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Causes, incidence, and risk factors:
Hyperviscosity results when the hematocrit is over 65 -- that is, the percentage of red blood cells (RBCs) in the infant's blood is greater than 65%. This may result from various conditions that develop before birth, such as hypoxia, inherited diseases, and birth defects. The excess RBCs blocks the flow of blood in the smallest capillaries. This leads to tissue death from lack of oxygen. This blocked blood flow can affect all organs, such as the kidneys, lungs, and brain. Infants with hyperviscosity may develop feeding problems, cyanosis, low blood sugar, jaundice, and more serious problems.
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