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| Definition: | Hyperviscosity is when blood flow is slowed and blocked because there are too many red blood cells in an infant's blood.
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| Alternative Names: | Neonatal polycythemia
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| Causes, incidence, and risk factors: | Hyperviscosity results when 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 high percentage of 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 other more serious findings.
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Review Date: 4/15/2003
Reviewed By: Elizabeth Hait, M.D., Department of Pediatrics, Rainbow Babies and Children's Hospital, Case Western Reserve University, Cleveland, OH. Review provided by VeriMed Healthcare Network.
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The information provided herein should not be used during any medical emergency or for the diagnosis or treatment of any medical condition. A licensed physician should be consulted for diagnosis and treatment of any and all medical conditions. Call 911 for all medical emergencies. Links to other sites are provided for information only -- they do not constitute endorsements of those other sites. Copyright 2003 A.D.A.M., Inc. Any duplication or distribution of the information contained herein is strictly prohibited.
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