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Pharm 2 Exam > ch 47 > Flashcards

ch 47 Flashcards

1
Q

Most deficiency anemias result from deficiency of what 3 things?

A

Iron, vitamin B12 or folic acid

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2
Q

What is the earliest stage of RBC development and what are they missing?

A

proerythroblasts and they lack hemoglobin

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3
Q

what is the second stage of RBC development and what have they gained?

A

erythroblasts, they have gained hemoglobin

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4
Q

Where do erythroblasts and proerythroblasts reside

A

Bone marrow

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5
Q

What is the third stage of RBC development and where do they go

A

reticulocytes - enter systemic circulation (immature erythrocytes)

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6
Q

At full maturity what are the RBCs known as

A

erythrocytes

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7
Q

what is the most common nutritional deficiency

A

iron

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8
Q

what is the max absorptive capacity of iron

A

3-4mg/day

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9
Q

what enhances absorption of iron

A

Vit C

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10
Q

What reduces absorption of iron

A

food

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11
Q

after uptake of iron, what are the 2 pathways it can undergo?

A

Storage within mucosal cells in the form of ferritin (iron plus a protein used to store iron)

Binding to transferrin (the iron transport protein) for distribution throughout the body

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12
Q

What are the 4 potential fates for transferrin bound iron

A

1) taken up by cells of the bone marrow for incorporation into hemoglobin - most
2) taken up by the liver and other tissues for storage as ferritin
3) taken up by muscle for production of myoglobin
4) taken up by all other tissues for production of iron-containing enzymes

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13
Q

explain the recycling of hgb

A

After 120 days of useful life, RBC s are catabolized. iron is released by this process and reenters the plasma bound to transferrin and the cycle starts over

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14
Q

how is iron excreted

A

excretion is minimal (if no iron was replaced the body stores would only drop 10% per year)

Most through bowel, some through urine and sweat

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15
Q

regulation of iron

A

through intestinal absorption

as body stores rise, uptake of iron declines
as body stores become depleted, uptake increases

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16
Q

Requirements for iron are determined by what?

A

rate of erythrocyte production

when RBC production is low, iron needs are low too
when high, iron needs are high

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17
Q

daily iron need of adult men

A

8mg dietary iron daily

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18
Q

daily iron need of adult women

A

15-18 mg per day to replace iron lost through menstruation

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19
Q

daily iron need for pregnant women and 2-3 months after pregnancy

A

need iron supplement of about 27mg per day bc diet will not be enough

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20
Q

what are the most common causes of increased iron demands?

A

1) pregnancy
2) blood volume expansion during infancy and early childhood
3) Chronic blood loss, usually GI or uterine origin

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21
Q

In the absence of iron for hemoglobin synthesis red blood cells become _____ and ____

A

microcytic and hypochromic

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22
Q

symptoms of reduced oxygen carrying capacity of blood

A

listlessness
fatigue
pallor of skin
pallor of mucous membranes

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23
Q

symptoms of severe tissue oxygen comprimise

A

tachycardia
dyspnea
angina

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24
Q

iron deficiency anemia is a ______anemia

A

microcytic

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25
Vitamin B deficiency and folate deficiency anemias are considered ______ anemia
Megaloblastic
26
What are common causes of anemia
``` poor diet chronic blood loss (menorrhagia, colon polyp, hemorrhoids) celiac disease lack of intrinsic factor enteritis low dietary intake ```
27
what two oral preps most often used for iron supplementation
``` ferrous salts (ferrous sulfate) carbonyl iron ```
28
what is the treatment of choice for iron deficiency anemia or to prevent this during increased needs such as pregnancy or chronic blood loss
Ferrous sulfate (also more cost effective)
29
adverse effects of ferrous sulfate
``` nausea heartburn bloating constipation diarrhea ``` most intense during initial therapy and become less disturbing with continued use may turn stools dark green or black - harmless and not a sign of Gi bleeding
30
Patients with what disorders should not take oral iron supplements?
Peptic ulcers Regional enteritis ulcerative colitis
31
what color can ferrous sulfate make the stool
dark green or black and is harmless - do not interpret this as a sign of gi bleeding
32
How do you prevent tooth staining while taking an liquid iron supplement
diluting liquid with juice or water administering the iron through a straw or with a dropper Rinsing mouth out after administration
33
in young children, what is the leading cause of poisoning fatalities?
Iron containing products rare in adults
34
what is the lethal dose of iron in children
2 to 10g
35
antacids do what to the absorption of iron
reduce
36
coadministration of iron with tetracyclines _____ the absorption of both
decrease
37
iron and ascorbic acid (vit c)
Vit c promotes absorption but combining the 2 offers no advantage over a simple increase in iron dose
38
Carbonyl iron and safety
higher margin of safety - requires a much higher dose to cause serious harm good bioavailability therapeutic efficacy equal to ferrous salts
39
what are the timelines for improvement with therapy
reticulocytes will increase within 4-7 days 1 week you will see increases in hgb and hct 1 month hemoglobin levels will rise by at least 2g/dl
40
if levels are not improving, what should the patient be evaluated for?
compliance continued bleeding inflammatory disease malabsorption of oral iron
41
combining iron therapies
should be avoided. They should not be receiving iron in more than one route at one time.
42
what other supplements should be avoided during iron therapy
avoid combo with vitamin B12 or folic acid
43
members of the vitamin B12 family are known as
cobalamins
44
How does vit B12 influence cell growth and division
by permitting the utilization of folic acid
45
efficient absorbption of vit b12 requires
intrinsic factor
46
in most cases vit b 12 def is result of
Impaired absorption
47
potential causes of impaired absorption
regional enteritis celiac diseae developed antibodies against vit 12-intrinsic factor complex - bariatric surgery someone who takes alot of acid reducing agent (need stomach acid to extract B12 from food
48
impaired absorption of b12 occurs secondary to _____ | this is called _______________
lack of intrinsic factor which is called pernicious anemia
49
what do you see in bone marrow in blood for megaloblastic or macrocytic anemia
large number of megaloblasts (oversized erythroblasts) appear in the bone marrow and macrocytes (oversized erythrocytes) appear in the blood
50
what is the principal cause of mortality from b12 def
severe anemia causes peripheral and cerebral hypoxia leading to heart failure and dysrhythmias causing death
51
hematologic effects of vit b12 deficiency can be reversed by
large doses of folic acid (will not improve the neurological pic)
52
Neurologically what happens in b12 deficiency
demyelination of neurons, primarily in spinal cord and brain
53
symptoms of demylenination
paresthesias of hands and feet reduction in deep tendon reflexes late - loss of memory, mood changes, hallucinations, psychosis if prolonged this can be permanent
54
in addition to disrupting production of erythrocytes, lack of b12 also prevents
the bone marrow from making leukocytes (wbc) and thrombocytes (platelets) which can lead to infection and spontaneous bleeding
55
for a pt with b12 deficiency exhibiting severe neuro effects what should be given?
parenteral cyanocobalamin
56
primary manifestations of moderate B12 deficiency are
megaloblasts in the bone marrow and macrocytes in peripheral blood - can be managed with vit B12 alone
57
what is the recommended treatment for severe B12 deficiency which disrupts all blood cells can lead to hypoxia, cerebrovascular insufficiency and heart failure
1) IM injection of Vitamin B12 and folic acid (folic acid accelerates recovery of hematologic deficits) 2) administration of 2-3 units of packed RBCs (to correct anemia quickly) 3) transfusion of platelets 4) therapy with abx if infection has developed
58
for patients who lack intrinsic factor or suffer from some other permanent cause of vit b12 malabsorbption, lifelong treatment is required. What does therapy and monitoring look like
Monthly IM or SC injections of cyanocobalamin (B12) or large daily oral doses or weekly intranasal doss plasma levels of vit b12 drawn every 3-6 months with blood samples examined for return of macrocytes and blood counts performed
59
hazard of folic acid in b12 deficiency
used to reverse hematologic affects but can mask b12 deficiency and neurological damage can continue to progress. take extra care to monitor B12 dosage when also using folic acid
60
A patient presents with megaloblastic anemia, what type of deficiency could this be?
Folic acid Vitamin B12 Both
61
How does folic acid take the place of Vitamin B12 for DNA synthesis?
When large amounts of folate are ingested, some can be activated through an alternative pathway that does not employ vit B12 which is why a large dose can fix hematologic problems
62
what are the 2 principal causes of folic acid deficiency
``` poor diet (esp in alcoholics) malabsorption secondary to intestinal disease ``` can also be from increase in demand (pregnancy, hemodialysis patients
63
what is the most common cause of folate deficiency
alcohol use disorder (reversible)
64
what is SPRUE
an intestinal malabsorption syndrome that decreases folic acid uptake.
65
How can Folate deficiency from Sprue be corrected
large doses of folic acid orally
66
folate deficiency is _____ to vit b12 deficiency with the exception of ____
identical | it does not injure the nervous system
67
_____ deficiency very early in pregnancy can cause neural tube defects such as spina bifida
folic acid
68
the US preventative services task force now recommends that all women who may become pregnant consume ________________
400 to 800ug of supplemental folic acid each day in addition to the folate they get from food
69
How should treatment of folic acid deficiency be initiated?
IM injection of folic acid and vitamin b12 After the initial injection, treatment should continue with folic acid alone 1000-2000 ug/day for 1-2 weeks maintenance of 400ug/day may be required
70
causes of iron deficiency due to reduced iron uptake
gastrectomy | SPRUE - disease of tropical regions is characterized by fatty diarrhea and malabsorption of nutrients
71
GI blood loss could indicate
Peptic ulcer disease | GI cancer
72
four ferrous iron salts
ferrous sulfate ferrous gluconate ferrous fumarate ferrous aspartate
73
potential causes of iron deficiency
pregnancy bleeding inadequate diet impaired intestinal absorption
74
the enterohepatic recirculation helps salvage up to ____ug of folate per day
200
75
why are pt with alcohol use disorder at highest risk for folate deficiency
insufficient folic acid in diet | derangement of enterohepatic recirculation secondary to alcohol induced injury to the liver
76
can folate deficiency be reversed in pt with alcohol use disorder
yes, with improved diet and reduced alcohol consumption, alcohol related folate deficiency will often reverse
77
how do you treat folate deficiency in SPRUE
large doses of folic acid orally
78
Plasma iron > 500, what should you do
toxic level, give parenteral deferoxamine
79
What type of B12 deficiency is when you add folic acid
Severe

Pharm 2 Exam (18 decks)

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