XII - The Hematopoietic and Lymphoid Systems Flashcards
Average volume per cell, expressed in femtoliters.
Mean cell volume (MCV)
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A reduction in the oxygen-transporting capacity of blood.
Anemia
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The average content of hemoglobin per red cell, expressed in picograms.
Mean cell hemoglobin (MCH)
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The average concentration of hemoglobin in a given volume of packed red cells, expressed in g/dL.
Mean cell hemoglobin concentration (MCHC)
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The coefficient of variation of red cell volume.
Red cell distribution width (RDW)
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Anemia of acute blood loss is described as ______.
Normocytic, normochromic anemia
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Life span of a normal red cell.
120 days
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Anemia characterized by an increased rate of cell destruction, a compensatory increase in erythropoeisis that results in reticulocytosis, and retention of products of cell destruction, including iron.
Hemolytic anemia
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A circulating protein that binds and clears free hemoglobin.
Haptoglobin
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Hemolysis that can result from mechanical trauma, or biochemical or physical agents that damage the red cell membrane.
Intravascular hemolysis
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Hemolysis which takes place largely within phagocytic cells of the spleen and liver.
Extravascular hemolysis
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This disorder is characterized by an intrinsic defect in the red cell membrane, that renders the cells spheroidal, less deformable and vulnerable to splenic sequestration and destruction.
Hereditary spherocytosis
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Small, dark nuclear remnants seen within red cells in PBS of hereditary spherocytosis.
Howell-Jolly bodies
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On PBS, red cells are spherical which lack central pallor, and they show increased osmotic fragility when placed in hypotonic salt solutions.
Hereditary spherocytosis
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Structural proteins that are defective in hereditary spherocytosis.
Spectrin and ankyrin
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This results from substitution of valine for glutamic acid at the 6th position of the B-chain, producing HbS.
Sickle cell anemia
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Bizarre, elongated, spindled or boat-shaped cells on PBS.
Sickle cell anemia
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Prominent cheekbones and changes in skull resembling a “crew-cut” skull x-ray.
Sickle cell anemia
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Patients with sickle cell disease are predisposed to infections caused by these type of bacteria.
Encapsulated bacteria
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Treatment for sickle cell disease by increasing levels of HbF.
Hydroxyurea
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Feared complication of sickle cell disease which can be triggered by pulmonary infections or fat emboli from necrotic marrow that secondarily involve the lung.
Acute chest syndrome
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Major complication of sickle cell disease which occurs in the setting of acute chest syndrome, causing ischemic injury to the CNS.
CNS stroke
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Represents a sudden but usually temporary cessation of erythropoeisis, usually triggered by Parvovirus B19 infections in patients with sickle cell disease.
Aplastic crises
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In Beta-Thalassemia, an individual who inherits one abnormal allele (out of 2) has this asymptomatic to mildly symptomatic condition.
B-Thalassemia minor/trait
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Individuals with B-thalassemia who inherit two abnormal alleles, with severe anemia requiring regular blood tranfusions.
B-Thalassemia major
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Red cells with a central, dark-red puddle due to collection of hemoglobin.
Target cells
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Target cells are often seen in this condition.
B-thalassemia minor
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In the PBS of this condition, nucleated red cells (normoblasts) are seen, which reflect underlying erythropoeisis.
B-thalassemia major
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Anemia of Beta-Thalassemia.
Microcytic, hypochromic
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Disease caused by deletion of 3 alpha globin genes.
Hemoglobin H disease
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Condition caused by deletion of 1 alpha globin gene.
Silent carrier
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Condition caused by deletion of 2 alpha globin genes.
Alpha thalassemia trait
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Condition caused by deletion of all four alpha globin genes.
Hydrops fetalis
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Precipitates of denatured globin seen in RBC’s.
Heinz bodies
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Heinz bodies are seen in the blood smear of this condition.
G6PD Deficiency
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Bite cells are seen in ________.
G6PD Deficiency
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A rare disorder of unknown etiology, causes hemolytic anemia which results from an acquired membrane defect secondary to a mutation that affects myeloid stem cells. Hemolysis occurs during sleep.
Paroxysmal nocturnal hemoglobinuria
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Hemolysis caused by IgG or IgA antiodies that are active at 37 C, which results in opsonization of red cells by the autoantibodies.
Warm antibody immunohemolytic anemia
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Anemia caused by low-affinity IgM which bind to red cell membranes only at temperature.
Cold antibody immunohemolytic anemia
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Anemia observed in a variety of pathologic states, in which small vessels become particularly obstructed.(e.g. DIC, malignant HTN, SLE, etc.)
Microangiopathic hemolytic anemia
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Schistiocytes, burr cells, helmet cells, triangle cells are seen in this condition.
Microangiopathic hemolytic anemia
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X-linked disorder in which red cells are unusually susceptible to damage cause by oxidants.
G6PD Deficiency
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Red blood cells in iron deficiency anemia.
Microcytic, hypochromic
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Diagnostic criteria for iron deficiency anemia: \_\_\_\_ Ferritin \_\_\_\_Serum iron level \_\_\_\_Transferrin saturation \_\_\_\_Total Iron Binding Capacity (TIBC)
Low ferritin Low serum iron levels Low transferrin saturation Increased TIBC (TOPNOTCH)Robbins Basic Pathology, 8th Ed. p. 435
Diagnostic criteria for anemia of chronic disease: \_\_\_\_ Ferritin \_\_\_\_Serum iron level \_\_\_\_Transferrin saturation \_\_\_\_Total Iron Binding Capacity (TIBC)
Increased ferritin Low serum iron levels Low transferrin saturation Decreased TIBC Normocytic, normochromic anemia (TOPNOTCH)Robbins Basic Pathology, 8th Ed. p. 435
Principal causes of megaloblastic anemia.
Folate deficiency
Vitamin B12 deficiency
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Bone marrow is markedly hypercellular as a result of increased number of megaloblasts, which are large cells that have delicate, finely reticulated nuclear chromatin and abundant basophilic cytoplasm.
Megaloblastic anemia
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PBS finding in neutrophils and red cells of patients with megaloblastic anemia.
Hypersegmented neutrophils, large, egg-shaped macro-ovalocytes
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Difference between megaloblastic and pernicious anemia.
Presence of neurologic abnormalities in pernicious anemia.
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Deficiency in folate causes this type of anemia.
Megaloblastic anemia
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Deficiency in Vitamin B12 causes this type of anemia.
Pernicious anemia
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Etiology of pernicious anemia.
1.Vitamin B12 malabsorption secondary to autoantibodies against parietal cells and intrinsic factor which is needed in its absorption.
2. Gastrectomy or ileal resection
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Principal neurologic lesion in pernicious anemia.
Demyelination of posterior and lateral columns of the spinal cord.
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Bone marrow is markedly hypocellular, with >90% of the intertrabecular space being occupied by fat.
Aplastic anemia
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Tear drop cells are also called __________.
Dacryocytes(TOPNOTCH)Robbins Basic Pathology, 8th Ed. p. 440
Dacryocytes are found in peripheral blood of patients with this type of anemia.
Myelophthisic anemia
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Increase in blood concentration of red cells, with an increase in Hgb concentration.
Polycythemia or erythrocytosis
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Polycythemia secondary to reduced plasma volume.
Relative polycythemia
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Polycythemia secondary to abnormal proliferation of myeloid stem cells and low erythropoeitin levels.
Primary polycythemia (Absolute) (TOPNOTCH)Robbins Basic Pathology, 8th Ed. p. 441
Polycythemia secondary to increased erythropoeitin levels due to lung disease, high-altitude living, cyanotic heart disease and EPO secreting tumors.
Secondary polycythemia (Absolute) (TOPNOTCH)Robbins Basic Pathology, 8th Ed. p. 441
Total white cell count is reduced to 1000 cells/uL. Affected persons are extremely susceptible to bacterial and fungal infections.
Neutropenia
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A self-limited disease of adolescents and young adults that is causd by B lymphocytotropic EBV characterized by fever, sore throat and generalized lymphadenitis, an increase of atypical lymphocytes in blood and an antibody and T cell response to EBV.
Infectious mononucleosis
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Cells with abundant cytoplasm 12-16um in diameter that contains azurophilic granules, and an oval, indented or folded nucleus.
Atypical lymphocytes (Infectious mononucleosis) (TOPNOTCH)Robbins Basic Pathology, 8th Ed. p. 442
Inflamed nodes are swollen, gray-red and engorged. There are large germinal centers containing numerous mitotic figures. Affected nodes are tender and fluctuant if with extensive abscess formation.
Acute nonspecific lymphadenitis
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This pattern is associated with infections or inflammatory processes that activate B cells which create a follicular or germinal center reaction. Lymph node architecture is preserved, lymphoid nodules vary in shape and size, mixed lymphocytic infiltrates with prominent phagocytic and mitotic activity within germinal centers.
Follicular hyperplasia
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Reactive pattern characterized by distention and prominence of the lymphatic sinusoids, due to marked hypertrophy of lining endothelial cells and an infiltrate of histiocytes. Encountered in lymph nodes draining cancers.
Sinus histiocytosis
TOPNOTCH
Characterized by reactive changes within T-cell regions of the lymph node, usually encountered during viral infections, following certain vaccinations, and immune reactions induced by certain drugs.
Paracortical hyperplasia
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