polycythaemia (poli-sy-theem-iă) n. an increase in the packed cell volume (haematocrit) in the blood. This may be due either to a decrease in the total volume of the plasma (relative p.) or to an increase in the total volume of the red cells (absolute p.). The latter may occur as a primary disease or as a secondary condition in association with various respiratory or circulatory disorders and with certain tumours. p. vera (p. rubra vera, erythraemia, Vaquez-Osler disease) a disease in which absolute polycythaemia is often accompanied by an increase in the numbers of white blood cells and platelets. Symptoms include headache, thromboses, cyanosis, plethora, and itching.
More From encyclopedia.com
Hypersplenism , Definition Hypersplenism is a type of disorder which causes the spleen to rapidly and prematurely destroy blood cells. Description The spleen is loca… Polycythemia , Definition Secondary polycythemia is an acquired form of a rare disorder characterized by an abnormal increase in the number of mature red cells in t… Erythrocyte Sedimentation Rate , Definition The erythrocyte sedimentation rate (ESR), or sedimentation rate (sed rate), is a measure of the settling of red blood cells in a tube of b… Sickle Cell Disease , Definition Sickle cell anemia, also called sickle cell disease (SS disease), is an inherited condition caused by having abnormal hemoglobin, the prot… Hematocrit , Definition The hematocrit is a test that measures the volume of blood by the percentage that is comprised of red blood cells. The hematocrit is also… Pernicious Anemia , Definition Pernicious anemia is a disease in which the red blood cells are abnormally formed, due to an inability to absorb vitamin B12. True pernici…
About this article
Updated About encyclopedia.com content Print Article
You Might Also Like