Anemia II Flashcards

1
Q

What are sideroblastic anemias?

A

a rare group of congenital or acquired disorders

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2
Q

Name the 7 underproduction anemias.

A

1) infection
2) inflammation
3) malignant disease
4) renal insufficiency
5) endocrine disorders
6) lead poisoning
7) malnutrition

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3
Q

In _____, TNF decreases iron availability from stores and decreases production of EPO, and INF-β inhibits erythropoiesis.

A

malignancies and sepsis

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4
Q

In malignancies and sepsis, ____ decreases iron availability from stores and decreases production of EPO, and ____ inhibits erythropoiesis.

A

TNF; INF-β

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5
Q

In malignancies and sepsis, TNF decreases _____ and ______, and INF-β inhibits _____.

A

iron availability from stores; decreases production of EPO; erythropoiesis

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6
Q

In ______, IL-1 diminishes iron mobilization and EPO production, and INF-γ inhibits proliferation of erythroid precursors.

A

chronic infection or inflammation

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7
Q

In chronic infection or inflammation, ___ diminishes iron mobilization and EPO production, and ____ inhibits
proliferation of erythroid precursors.

A

IL-1; INF-γ

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8
Q

In chronic infection or inflammation, IL-1 diminishes iron _____, and INF-γ inhibits ______.

A

mobilization and EPO production; proliferation of erythroid precursors

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9
Q

With _____, the lack of EPO causes anemia.

A

renal insufficiency

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10
Q

With renal insufficiency, the lack of ____ causes anemia.

A

EPO

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11
Q

In lead intoxication, lead inhibits synthesis of _____ and the enzyme that ______.

A

protoporphyrin; ligates iron to the porphyrin ring

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12
Q

In _____, lead inhibits synthesis of protoporphyrin and the enzyme that ligates iron to the porphyrin ring.

A

lead intoxication

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13
Q

What is the treatment for lead intoxication?

A

chelation therapy

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14
Q

Chelation therapy is the treatment for ____.

A

lead intoxication

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15
Q

What is the treatment for anemia caused by renal insufficiency?

A

EPO

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16
Q

What is the treatment for anemia caused by endocrine disorders?

A

HRT

17
Q

What is Methyltetrahydrofolate?

A

an essential cofactor in the synthesis of methionine from homocysteine in hematopoesis

18
Q

__________ is a metabolite of folic acid.

A

Methyltetrahydrofolate

19
Q

Methyltetrahydrofolate is a metabolite of ____.

A

folic acid

20
Q

What is the protein carrier of vitamin B12?

A

intrinsic factor (IF)

21
Q

Where is vitamin B12 absorbed?

A

in the terminal ileum

22
Q

Where is vitamin B12 stored?

A

in the liver

23
Q

What is the most common cause of vitamin B12 deficiency?

A

pernicious anemia

24
Q

What happens in pernicious anemia?

A

autoimmune destruction of IF-producing parietal cells

25
Q

Where is folate absorbed?

A

the jejunum

26
Q

How is folate stored and where?

A

as methyltetrahydrofolate in the liver

27
Q

What is the most common cause of folate deficiency?

A

inadequate dietary intake

28
Q

Both _____ and ______ result in megaloblastic anemia.

A

folic acid; vitamin B12 deficiency

29
Q

Both folic acid and vitamin B12 deficiency result in _____.

A

megaloblastic anemia

30
Q

What is the time of onset of folate deficiency?

A

within weeks

31
Q

What is the time of onset of vitamin B12 deficiency?

A

several months

32
Q

In the bone marrow, ______ leads to an alteration of the myeloid:erythroid (M:E) ratio.

A

erythroid hyperplasia

33
Q

In the bone marrow, erythroid hyperplasia leads to an alteration of the _____.

A

myeloid:erythroid (M:E) ratio