Chapter 17 Hematopoietic Drugs
Types of Anemia | Specific Cause/Pathophysiology |
---|---|
Microcytic Anemia | |
Iron deficiency anemia | |
Anemia of chronic disease | |
Thalassemia | Hereditary disorder characterized by decreased globin chain production |
Megaloblastic Anemia | |
Folic acid deficiency anemia | Interference with utilization by other drugs (phenytoin, primidone, and phenobarbital; oral contraceptives; isoniazid) |
Vitamin B12 deficiency anemia | |
Normocytic Anemia | |
Anemia due to bone marrow failure |
b. Iron deficiency, anemia of chronic disease, and thalassemia (α and β) result in small RBCs with insufficient hemoglobin (microcytic hypochromic anemia)
b. Both folic acid deficiency and vitamin B12 deficiency cause impaired production and nuclear maturation of erythroid precursors (macrocytic hyperchromic or megaloblastic anemia).
TABLE 17-2 Causes of Iron Deficiency Anemia
Classification | Causes | Discussion |
---|---|---|
Blood loss | Gastrointestinal loss | |
Menorrhagia | Most common cause in women <50-yrs-old | |
Increased utilization | Pregnancy/lactation | |
Infants/children | Iron required for tissue growth and expansion of blood volume | |
Decreased intake | ||
Elderly | Restricted diets with little meat (lack of heme iron) | |
Decreased absorption | Celiac sprue | Absence of villous surface in the duodenum |
Intravascular hemolysis | Microangiopathic hemolytic anemia | Chronic loss of Hb in urine leads to iron deficiency |
Hb, hemoglobin; NSAID, non-steroidal anti-inflammatory drug; PUD, peptic ulcer disease.
(Modified from Goljan EF: Rapid Review Pathology, 3rd ed. Philadelphia, Mosby, 2010, Table 11-1.)
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