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However, in people with conditions where the cells die early (such as sickle cell disease), parvovirus infection can lead to severe anemia. [15] [16] More frequently, parvovirus B19 is associated with aplastic crisis, which involves only red blood cells (despite the name). Aplastic anemia involves all cell lines.
These diseases are typically diseases in which chronic blood loss requires frequent blood transfusions, such as sickle cell anemia and thalassemia, though beta thalassemia minor has been associated with hemosiderin deposits in the liver in those with non-alcoholic fatty liver disease independent of any transfusions. [5] [6]
Hypochromic anemia is a generic term for any type of anemia in which the red blood cells are paler than normal. ( Hypo - refers to less , and chromic means colour .) A normal red blood cell has a biconcave disk shape and will have an area of pallor in its center when viewed microscopically.
Hemoglobin (haemoglobin, [a] Hb or Hgb) is a protein containing iron that facilitates the transport of oxygen in red blood cells.Almost all vertebrates contain hemoglobin, [3] with the sole exception of the fish family Channichthyidae. [4]
In addition, there is sickle cell trait (HbAS) which is defined by having HbA and HbS. This makes the individual heterozygous for sickle cell. Of the world population, it is estimated that there are about 300 million individuals with the sickle cell trait and about 100 million of those are in sub-Saharan Africa. [18]
Sickle cell nephropathy is a type of kidney disease associated with sickle cell disease which causes kidney complications as a result of sickling of red blood cells in the small blood vessels. The hypertonic and relatively hypoxic environment of the renal medulla , coupled with the slow blood flow in the vasa recta , favors sickling of red ...
Hydroxycarbamide, also known as hydroxyurea, is a medication used in sickle-cell disease, essential thrombocythemia, chronic myelogenous leukemia, polycythemia vera, and cervical cancer. [4] [5] In sickle-cell disease it increases fetal hemoglobin and decreases the number of attacks. [4] It is taken by mouth. [4]
Megaloblastic anemia is a type of macrocytic anemia. An anemia is a red blood cell defect that can lead to an undersupply of oxygen. [1] Megaloblastic anemia results from inhibition of DNA synthesis during red blood cell production. [2] When DNA synthesis is impaired, the cell cycle cannot progress from the G2 growth stage to the mitosis (M ...