The condition of having less than the normal number of red blood cells or less than the normal quantity of hemoglobin in the blood. The oxygen-carrying capacity of the blood is, therefore, decreased. Persons with anemia may feel tired and fatigue easily, appear pale, develop palpitations and become unusually short of breath. Children with chronic anemia are prone to infections and learning problems. Anemia has four basic causes. One or more of these causes must be operating to produce anemia: Hemorrhage — bleeding Hemolysis — excessive destruction of red blood cells Underproduction of red blood cells Not enough normal hemoglobin Women are more likely than men to have anemia because of the loss of blood each month through menstruation. Iron deficiency anemia is common and in adults is most often due to chronic blood loss. This can be from menstruation or from small amounts of repeated bleeding (which can be very subtle) and in children is due mainly to not enough iron in the diet. Anemia is also often due to gastrointestinal bleeding caused by medications including such very common drugs as aspirin and ibuprofen (Advil or Motrin). There are many forms of anemia, some of them common, others rare. They include, for example: {{}}Aplastic anemia Benzene poisoning Fanconi anemia Hemolytic disease of the newborn Hereditary spherocytosis Iron deficiency anemia Osteopetrosis Pernicious anemia Sickle cell disease Thalassemia Myelodysplastic syndrome and a host of other bone marrow diseases.
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Any condition in which the number of red blood cells per mm3, the amount of hemoglobin in 100 ml of blood, and/or the volume of packed red blood cells per 100 ml of blood are less than normal; clinically, generally pertaining to the concentration of oxygen-transporting material in a designated volume of blood, in contrast to total quantities as in oligocythemia, oligochromemia, and oligemia. A. is frequently manifested by pallor of the skin and mucous membranes, shortness of breath, palpitations of the heart, soft systolic murmurs, lethargy, and fatigability. [G. anaimia, fr. an- priv. + haima, blood]
- achlorhydric a. a form of chronic hypochromic microcytic a. associated with achlorhydria or achylia gastrica; observed most frequently in women in the third to fifth decades. SYN: Faber a., Faber syndrome.
- achrestic a. a form of chronic progressive macrocytic a. that can be fatal in which the changes in bone marrow and circulating blood closely resemble those of pernicious a., but in which there is only transient or no response to therapy with vitamin B12; glossitis, gastrointestinal disturbances, central nervous system disease, and pyrexia are not observed, and there is only little bleeding or hemolysis. [G. a- priv. + chresis, a using]
- acquired hemolytic a. nonhereditary acute or chronic a. associated with or caused by extracorpuscular factors, e.g., certain infectious agents, chemicals (including autoantibodies or therapeutic agents), burns, toxic materials from higher plant and animal forms (including snake venoms).
- Addison a. SYN: pernicious a..
- addisonian a. SYN: pernicious a..
- angiopathic hemolytic a. a rare postpartum a. of unknown etiology with uremia and nephrosclerosis; may be a rare complication following use of contraceptive steroids.
- aplastic a. a. characterized by a greatly decreased formation of erythrocytes and hemoglobin, usually associated with pronounced granulocytopenia and thrombocytopenia, as a result of hypoplastic or aplastic bone marrow. SYN: a. gravis, Ehrlich a..
- asiderotic a. SYN: chlorosis.
- autoimmune hemolytic a. 1. cold-antibody type, caused by hemagglutinating antibody (usually IgM class) maximally active at 4°C; and resulting from severe hemolysis in cold hemagglutinin disease; 2. warm-antibody type (which is the most common), acquired hemolytic a. due to serum autoantibodies (usually IgG class), maximally active at 37°C, that react with the patient's red blood cells; it varies in severity, occurs in all age groups of both sexes, and may be idiopathic or secondary to neoplastic, autoimmune, or other disease.
- Bartonella a. a. occurring in infection with Bartonella bacilliformis and characterized by an acute febrile a. of rapid onset and high mortality. Occurs in central Andean mountains of northern South America; vector is phlebotomine sandfly, Lutzomyia.
- Belgian Congo a. SYN: kasai.
- Biermer a. SYN: pernicious a..
- brickmaker's a. a. associated with hookworm disease.
- chlorotic a. SYN: chlorosis.
- congenital a. SYN: erythroblastosis fetalis.
- congenital dyserythropoietic a. a group of anemias characterized by ineffective erythropoiesis, bone marrow erythroblastic multinuclearity, and secondary hemochromatosis. Three types are described: type I [MIM224120], macrocytic, megaloblastic a. with erythroblastic internuclear chromatin bridges; type II, [MIM*224100], normoblastic a. with multinucleated erythroblasts; type III, macrocytic a. with erythroblastic multinuclearity and gigantoblasts [MIM*105600]. Both types I and II are autosomal recessively inherited, type III is of autosomal dominant inheritance.
- congenital hemolytic a. accelerated destruction of red blood cells due to an inherited defect, such as in the membrane in hereditary spherocytosis.
- congenital hypoplastic a. [MIM*205900] a macrocytic a. resulting from congenital hypoplasia of the bone marrow, which is grossly deficient in erythroid precursors while other elements are normal; a. is progressive and severe, but leukocyte and platelet counts are normal or slightly reduced; survival of transfused erythrocytes is normal; minor congenital anomalies are found in some patients. Both autosomal dominant and recessive forms have been described, caused by mutation in the gene encoding ribosomal protein S19 (RBS19) on chromosomal 19q. SYN: congenital nonregenerative a., Diamond-Blackfan a., Diamond-Blackfan syndrome, erythrogenesis imperfecta, familial hypoplastic a., pure red cell a..
- congenital nonregenerative a. SYN: congenital hypoplastic a..
- cow milk a. a. occurring in infants fed cow milk without iron supplementation, attributed to digestive tract allergic reaction leading to blood loss and hence iron deficiency.
- deficiency a. SYN: nutritional a..
- Diamond-Blackfan a. SYN: congenital hypoplastic a..
- dilution a. SYN: hydremia.
- dimorphic a. a. in which two distinct forms of red cells are circulating.
- diphyllobothrium a. a rare form of macrocytic a. associated with Diphyllobothrium latum infection, especially in Finland. SYN: fish tapeworm a..
- drepanocytic a. SYN: sickle cell a..
- dyshemopoietic a. any a. resulting from defective function of the bone marrow.
- Ehrlich a. SYN: aplastic a..
- elliptocytary a. (e-lip′to-si′tar-e) a. with elliptocytosis; a heterogeneous group of inherited anemias having in common elliptical red cells on blood smear. The defect may reside in dysfunction or deficiency of proteins of the red cell membrane skeleton. SYN: elliptocytotic a..
- elliptocytotic a. (e-lip′to-si-tot′ik) SYN: elliptocytary a..
- erythroblastic a. a. characterized by the presence of large numbers of nucleated red cells (normoblasts and erythroblasts) in the peripheral blood. Seen in newborns with hemolytic a., due to isoimmunization, such as that caused by Rh or ABO incompatibility. SEE ALSO: erythroblastosis fetalis. SYN: erythronormoblastic a..
- erythronormoblastic a. (e-rith′ro-nor′mo-blast- ik) SYN: erythroblastic a..
- essential a. obsolete term for pernicious a.; also used formerly for any type of a. of unknown mechanism.
- Faber a. SYN: achlorhydric a..
- false a. SYN: pseudoanemia.
- familial microcytic a. [MIM*206200] a rare type of autosomal recessive hypochromic microcytic a. associated with a defect of iron metabolism characterized by high serum iron, hepatic iron deposits, and absence of stainable bone marrow iron stores.
- familial pyridoxine-responsive a. [MIM*206000] a rare autosomal recessive hereditary hypochromic a.; responsive to pyridoxine.
- Fanconi a. a type of idiopathic refractory a. characterized by pancytopenia, hypoplasia of the bone marrow, and congenital anomalies, occurring in members of the same family (an autosomal recessive trait in at least five nonallelic types [MIM*227650, 227660, 227645, 227646, 600901]); the a. is normocytic or slightly macrocytic, macrocytes and target cells may be found in the circulating blood, and the leukopenia usually is due to neutropenia. Congenital anomalies include short stature; microcephaly; hypogenitalism; strabismus; anomalies of the thumbs, radii, and kidneys and urinary tract; mental retardation; and microphthalmia. SYN: congenital aplastic a., congenital pancytopenia, Fanconi pancytopenia, Fanconi syndrome (1).
- fish tapeworm a. SYN: diphyllobothrium a..
- folic acid deficiency a. a. due to deficiency of folic acid, characterized by large-sized red blood cells (macrocytosis) and presence of large nuclei in erythroid precursor cells (megaloblasts) in the bone marrow.
- goat's milk a. nutritional a. in infants maintained chiefly with goat's milk, which is relatively poor in iron content.
- a. gravis SYN: aplastic a..
- ground itch a. a. associated with hookworm disease.
- Heinz body a. See unstable hemoglobin hemolytic a..
- hemolytic a. any a. resulting from an increased rate of erythrocyte destruction.
- hemolytic a. of newborn SYN: erythroblastosis fetalis.
- hemorrhagic a. a. resulting directly from loss of blood.
- hookworm a. a. associated with heavy infestation by Ancylostoma duodenale or Necator americanus.
- hypochromic a. a. characterized by a decrease in the ratio of the weight of hemoglobin to the volume of the erythrocyte, i.e., the mean corpuscular hemoglobin concentration is less than normal; the individual cells contain less hemoglobin than they do under optimal conditions and stain more faintly.
- hypoferric a. SYN: iron deficiency a..
- hypoplastic a. progressive nonregenerative a. resulting from greatly depressed, inadequately functioning bone marrow; as the process persists, aplastic a. may occur.
- infectious a. a. developing as a complication of infection; probably results from depressed formation and short survival of erythrocytes and abnormal iron metabolism.
- iron deficiency a. hypochromic microcytic a. characterized by low serum iron, increased serum iron-binding capacity, decreased serum ferritin, and decreased marrow iron stores. SYN: hypoferric a..
- isochromic a. SYN: normochromic a..
- lead a. a. associated with poisoning from lead; thought to result from a defect in synthesis of hemoglobin based on the failure of iron being combined in the porphyrin ring.
- leukoerythroblastic a. SYN: leukoerythroblastosis.
- local a. a. resulting from a decreased supply of blood to a part, as in the occlusion of a vessel.
- macrocytic a. any a. in which the average size of circulating erythrocytes is greater than normal, i.e., the mean corpuscular volume is 94 cu μm3 or more (normal range, 82–92 cu μm3), including such syndromes as pernicious a., sprue, celiac disease, macrocytic a. of pregnancy, a. of diphyllobothriasis, and others. SYN: megalocytic a..
- macrocytic achylic a. SYN: pernicious a..
- macrocytic a. of pregnancy an a. occurring in pregnancy, related to folate deficiency and characterized by a low level of hemoglobin and a reduced number of erythrocytes, which are larger than normal (macrocytes).
- macrocytic a. tropical the macrocytic, megaloblastic a. of tropical sprue.
- malignant a. SYN: pernicious a..
- Marchiafava-Micheli a. SYN: paroxysmal nocturnal hemoglobinuria.
- megaloblastic a. any a. in which there is a predominant number of megaloblastic erythroblasts, and relatively few normoblasts, among the hyperplastic erythroid cells in the bone marrow (as in pernicious a.).
- megalocytic a. SYN: macrocytic a..
- metaplastic a. pernicious a. in which the various formed elements in the blood are changed, e.g., multisegmented, unusually large neutrophils (macropolycytes), immature myeloid cells, bizarre platelets.
- microangiopathic hemolytic a. hemolysis due to intravascular fragmentation of red blood cells; may be due to microcirculatory lesions or the insertion of cardiac or intravascular prosthetic devices.
- microcytic a. any a. in which the average size of circulating erythrocytes is smaller than normal, i.e., the mean corpuscular volume is 80 cu μm or less (normal range, 82–92 cu μm).
- microdrepanocytic a. SYN: sickle cell-thalassemia disease.
- milk a. a type of hypochromic microcytic a., resulting from deficiency of iron, occurring in infants maintained on a milk diet for too long a time.
- mountain a. term sometimes used for mountain sickness.
- neonatal a. SYN: erythroblastosis fetalis.
- a. neonatorum SYN: erythroblastosis fetalis.
- normochromic a. any a. in which the concentration of hemoglobin in the erythrocytes is within the normal range, i.e., the mean corpuscular hemoglobin concentration is from 32 to 36%. SYN: isochromic a..
- normocytic a. any a. in which the erythrocytes are normal in size, i.e., the mean corpuscular volume ranges from 82 to 92 cu μm.
- nutritional a. any a. resulting from a dietary deficiency of materials essential to red blood cell formation, e.g., iron, vitamins (especially folic acid), protein. SYN: deficiency a..
- nutritional macrocytic a. macrocytic, megaloblastic a. due to deficiency of either folate or vitamin B12.
- osteosclerotic a. a. due to compromise of erythropoiesis due to osteosclerosis.
- pernicious a. [MIM*361000] a chronic progressive a. of older adults (occurring more frequently during the fifth and later decades, rarely prior to 30 years of age), due to failure of absorption of vitamin B12, usually resulting from a defect of the stomach accompanied by mucosal atrophy and associated with lack of secretion of “intrinsic” factor; characterized by numbness and tingling, weakness, and a sore smooth tongue, as well as dyspnea after slight exertion, faintness, pallor of the skin and mucous membranes, anorexia, diarrhea, loss of weight, and fever; laboratory studies usually reveal greatly decreased red blood cell counts, low levels of hemoglobin, numerous characteristically oval shaped macrocytic erythrocytes (color index greater than normal, but not truly hyperchromic), and hypo- or achlorhydria, in association with a predominant number of megaloblasts and relatively few normoblasts in the bone marrow; the leukocyte count in peripheral blood may be less than normal, with relative lymphocytosis and hypersegmented neutrophils; a low level of vitamin B12 is found in peripheral red blood cells; administration of vitamin B12 results in a characteristic reticulocyte response, relief from symptoms, and an increase in erythrocytes, provided that pernicious a. is not complicated by another disease; the condition is not actually “pernicious,” as it was prior to the availability of therapy with vitamin B12. At least two autosomal recessive forms are known. In one there is a defect of intrinsic factor [MIM*26100] and in the other a defective absorption of vitamin B12 from the intestine [MIM*261100]. SYN: Addison a., Addison-Biermer disease, addisonian a., Biermer a., Biermer disease, macrocytic achylic a., malignant a..
- physiologic a. an obsolete term for apparent a. caused by increased fluid volume of the blood (overhydration).
- polar a. a form of a. sometimes observed in natives of temperate climates when they migrate to the Arctic or Antarctic regions.
- posthemorrhagic a. an acute a. caused by fairly sudden and rapid loss of blood, as by traumatic laceration of a relatively large vessel, erosion of an artery in a duodenal ulcer, or hemorrhage in an ectopic pregnancy. SYN: traumatic a..
- primary erythroblastic a. SYN: thalassemia major.
- primary refractory a. any of a group of anemic conditions in which there is persistent, frequently advanced a. that is not successfully treated by any means except blood transfusions, and that is not associated with another primary disease.
- pure red cell a. SYN: congenital hypoplastic a..
- radiation a. hypoplastic a. sometimes occurring after high-level acute or low-level chronic exposure to ionizing radiation.
- refractory a. progressive a. unresponsive to therapy other than transfusion. See primary refractory a., secondary refractory a..
- scorbutic a. a. occurring in patients with scurvy, usually due to coincident nutritional deficiency; e.g., the “megaloblastic a. of scurvy” is due to concomitant folic acid deficiency.
- secondary refractory a. any persistent a. that is successfully treated only by blood transfusions, and that is associated with another condition.
- sickle cell a. [MIM*141900] an autosomal recessive a. characterized by crescent- or sickle-shaped erythrocytes and accelerated hemolysis, due to substitution of a single amino acid (valine for glutamic acid) in the sixth position of the β-chain of hemoglobin the gene of which is on chromosome 11; affected homozygotes have 85–95% Hb S and severe a., while heterozygotes (said to have sickle cell trait) have 40–45% Hb S, the rest being normal Hb A; low oxygen tension causes polymerization of the abnormal β-chains, thus distorting the shape of the red blood cells to the sickle form. Homozygotes develop “crisis” episodes of severe pain due to microvascular occlusions, bone infarcts, leg ulcers, and atrophy of the spleen associated with increased susceptibility to bacterial infections, especially streptococcal pneumonia. Occurs most commonly in individuals of African descent. SYN: drepanocytic a., sickle cell disease, vasoocclusive crisis.
- sideroblastic a., sideroachrestic a. refractory a. characterized by the presence of sideroblasts in the bone marrow.
- slaty a. an ash-gray pallor in poisoning from acetanilide or silver (argyria).
- spastic a. local a. resulting from nontransitory intrinsic contraction of the arterial vessels supplying the affected region.
- spherocytic a. SYN: hereditary spherocytosis.
- splenic a. SYN: Banti syndrome.
- spur cell a. a. in which the red cells have a spiculated appearance and are destroyed prematurely, predominantly in the spleen; may be seen in patients with severe liver disease as a result of an abnormality in the cholesterol content of the red cell membrane.
- target cell a. any a. with a conspicuous number of target cells in the peripheral blood; characteristic of the thalassemias and also found in several hemoglobinopathies.
- toxic a. any a. resulting from the destructive effects of a chemical, metabolic poison, bacterial toxin, venom, and similar materials.
- tropical a. various syndromes frequently observed in persons in tropical climates, usually resulting from nutritional deficiencies or hookworm or other parasitic diseases.
- unstable hemoglobin hemolytic a. a congenital hemolytic a., due to autosomal inheritance of one of many unstable hemoglobins. The a. is of variable severity and characterized by the presence in vivo or in vitro of Heinz bodies.

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ane·mia or chiefly Brit anae·mia ə-'nē-mē-ə n
1) a condition in which the blood is deficient in red blood cells, in hemoglobin, or in total volume see APLASTIC ANEMIA, HYPERCHROMIC ANEMIA, HYPOCHROMIC ANEMIA, MEGALOBLASTIC ANEMIA, MICROCYTIC ANEMIA, PERNICIOUS ANEMIA, SICKLE-CELL ANEMIA compare OLIGOCYTHEMIA
ane·mic or chiefly Brit anae·mic ə-'nē-mik adj
ane·mi·cal·ly or chiefly Brit anae·mi·cal·ly -mi-k(ə-)lē adv

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ane·mia (ə-neґme-ə) [an-1 + -emia] a reduction below normal in the concentration of erythrocytes or hemoglobin in the blood, measured per mm3 or by volume of packed red cells per 100 mL of blood; it occurs when the equilibrium is disturbed between blood loss (through bleeding or destruction) and blood production. anemic adj

Medical dictionary. 2011.

Look at other dictionaries:

  • anemia — f. hemat. Disminución de la concentración de hemoglobina o del número de eritrocitos en la sangre por bajo de los límites normales para la edad y sexo del sujeto. Puede ser debido a una pérdida o destrucción de los eritrocitos o por un trastorno… …   Diccionario médico

  • anemia — (Del gr. ἀναιμία, carencia de sangre). f. Med. Empobrecimiento de la sangre por disminución de su cantidad total, como ocurre después de las hemorragias, o por enfermedades, ya hereditarias, ya adquiridas, que amenguan la cantidad de hemoglobina… …   Diccionario de la lengua española

  • anemia — ANEMIÁ, anemiez, vb. I. Refl şi tranz. A ajunge sau a face să ajungă în stare de slăbiciune din cauza anemiei. [pr.: mi a] – Din fr. (s )anémier. Trimis de ana zecheru, 09.02.2004. Sursa: DEX 98  anemiá vb. (sil. mi a), ind. prez. 3 …   Dicționar Român

  • Anemia — Anemia: Anemia (растение) род папоротниковидных растений из семейства Schizaeaceae Anemia (насекомое) род жесткокрылых насекомых семейства чернотелок …   Википедия

  • anemia — /ane mia/ s.f. [dal gr. anaimía, der. di aíma sangue , col pref. an priv.]. 1. (med.) [condizione morbosa caratterizzata da diminuzione del numero di globuli rossi o di emoglobina nel sangue] ▶◀ ‖ clorosi, oligoemia. ● Espressioni: anemia… …   Enciclopedia Italiana

  • anemia — sustantivo femenino 1. (no contable) Área: medicina Disminución anormal del número de glóbulos rojos en la sangre: Como consecuencia de la hemorragia, Ana tuvo una anemia grave que la dejó muy débil …   Diccionario Salamanca de la Lengua Española

  • anemia — anemia. См. малокровие. (Источник: «Англо русский толковый словарь генетических терминов». Арефьев В.А., Лисовенко Л.А., Москва: Изд во ВНИРО, 1995 г.) …   Молекулярная биология и генетика. Толковый словарь.

  • anemia — (n.) alternative (chiefly U.S.) spelling of ANAEMIA (Cf. anaemia) (q.v.). See AE (Cf. ae). As a genus of plants, Modern Latin, from Gk. aneimon unclad, from privative prefix an (see AN (Cf. an ) (1)) + eima a dress, garment …   Etymology dictionary

  • anemia — s. f. 1.  [Medicina] Diminuição dos glóbulos vermelhos do sangue. 2.  [Medicina] Estado causado por essa diminuição. 3. Debilidade ou fraqueza. ≠ FORÇA, PUJANÇA, VIGOR   ‣ Etimologia: grego anaimía, falta de sangue …   Dicionário da Língua Portuguesa

  • anemia — {{/stl 13}}{{stl 8}}rz. ż IIb, blm {{/stl 8}}{{stl 7}} choroba polegająca na obniżeniu się zawartości hemoglobiny we krwi lub spadku poniżej normy liczby krwinek czerwonych, przejawiająca się bladością, skróceniem oddechu i niedostatkiem energii; …   Langenscheidt Polski wyjaśnień

  • anemia — (Brit. anaemia) ► NOUN ▪ a shortage of red cells or haemoglobin in the blood, resulting in pallor and weariness. ORIGIN from Greek an without + haima blood …   English terms dictionary

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