La policitemia, también conocida como plétora o eritrocitosis, es un trastorno en el cual aumenta el hematocrito, es decir, la proporción de glóbulos rojos por volumen sanguíneo, debido a un aumento del número de eritrocitos o a una disminución del plasma sanguíneo —policitemia absoluta o relativa, respectivamente—.Es el opuesto de la anemia, que ocurre cuando hay escasez de glóbulos rojos o hemoglobina en la circulación sanguínea.

Leer el artículo completo en Wikipedia · CC-BY-SA

Polycythemia (also known as polycythaemia or polyglobulia) is a disease state in which the proportion of blood volume that is occupied by red blood cells increases. Blood volume proportions can be measured as hematocrit level. A hematocrit of >55% is seen in polycythemia. It can be due to an increase in the number of red blood cells ("absolute polycythemia") or to a decrease in the volume of plasma ("relative polycythemia"). Polycythemia is sometimes called erythrocytosis, but the terms are not synonymous because polycythemia refers to any increase in red blood cells, whereas erythrocytosis only refers to a documented increase of red cell mass. The emergency treatment of polycythemia (e.g., in hyperviscosity or thrombosis) is by venesection, the removal of blood from the circulation. Depending on the underlying cause, venesection may also be used on a regular basis to reduce the red blood cell count. Cytostatics (busulfan, hydroxyurea) are sometimes used if venesection is ineffective or contraindicated.

Leer el artículo completo en Wikipedia · CC-BY-SA