RBC DISORDERS-2 Flashcards Preview


Flashcards in RBC DISORDERS-2 Deck (19):

 The attached image compares a marrow aspirate from a normal individual with the BM aspirate from an individual with the condition described below:


Pallor, lemon yellow tinged skin

beefy red tongue

PS: hypersegmented neutrophils

What are the 3 key BM findings in this condition?

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1. Nuclear cytoplasmic dysynchrony - cytoplasmic differentiation, as assessed by increasing hemoglobin production, is normal, nuclear maturation is retarded

2. markedly hypercellular

3. giant metamyelocytes and band forms



1.2 features of anemia of chronic renal failure on  a peripheral smear

2. Why do they develop anemia?

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1. normocytic anemia,presence of burr cells

2. diminished synthesis of EPO


peripheral pancytopenia (decreased RBCs, WBCs, platelets)

reticulocyte index <2

 marrow hypoplasia

No splenomegaly

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Aplastic anemia


What features on a peripheral smear are characteristic of myelophthisic anemia?

abnormal release of nucleated erythroid precursors and immature granulocytic forms ka leukoerythroblastic reaction

teardrop cells


two important biochemical reactions requiring Vitamin B12

1. conversion of methylmalonyl-coenzyme A (CoA) to succinyl-CoA

2. conversion of homocysteine to methionine.


autoimmune disorder characterized by the destruction of gastric parietal cells

1. What are the 2 types of antobodies produced?

2. How does this disorder lead to megaloblastic anemia?

1. Antibodies against parietal cells and antibodies against intrinsic factor

2. Parietal cells are the source of IF. Without intrinsic factor, food cobalamin cannot be absorbed in the distal ileum


Time duration before a reticulocyte repsonse is observed in acute blood loss?

5-7 days


Differentiate folic acid versus Vit B 12 deificiency

decreased folate levels in the serum or red cells.

serum homocysteine levels are increased, but methylmalonate concentrations are normal

neurologic changes do not occur.


List 4 causes for Vitamin B12 deficiency apart from decreased intake.

a. gastrectomy

b. ileal resection/disease

c. fish tapeworm infestation

d. bacterial overgrowth in blind loops and bowel diverticula


How does methotrexate cause folic acid deficiency?

Inhibits dihydrofolate reductase


most common cause for folic acid deficiency



Lab findings in Vit B12 deficiency apart from PS and BM 

low serum vitamin B12 <200pg/ml

elevated serum levels of homocysteine

Elevated methyl malonic acid

MCV >110 fL


Why do you get a slight increase in the level of nonconjugated bilirubin in the serum and a marked increase in serum lactate dehydrogenase (LDH) in megaloblastic anemia?

increased rate of apoptosis of erythroid precursor cells due to derangement in DNA synthesis


Stomach morphology in pernicious anemia

Fundic gland atrophy

Intestinal metaplasia


features of megaloblastic anemia on peripheral smear

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Neutrophils are larger than normal and show nuclear hypersegmentation, having five or more nuclear lobules instead of the normal three to four

reticulocyte count is low


1. In whom does Parvovirus B19 infection trigger an aplastic crisis?

2. How does it trigger an aplastic crisis?

1. In persons with moderate to severe hemolytic anemias, even a brief cessation of erythropoiesis results in rapid worsening of the anemia, producing an aplastic crisis.

2. attaches to P antigen on the RBC membrane and destroys red cell progenitors


Name the type of anemia described below:

space-occupying lesions replace normal marrow elements

Myelophthisic anemia


2 possible causes for myelophthisic anemia

1.metastatic cancer- breast, lung, and prostate

2.granulomatous disease


1. 3 Signs of Subacute combined degeneration of the Spinal Cord 

2. What is the reason for demyelination?

1. posterior column (PC) - loss of vibratory sensation and proprioception (joint sense).

lateral corticospinal tract (LCST) -  spasticity.

dorsal spinocerebellar tract (DSCT) - ataxia.


2. lack of methyl-B12 for conversion of homocysteine to methionine. ↓SAM → ↓methyl group for Phosphatidylethanolamine conversion to Phosphatidylcholine for incorporation into myelin