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BRS CARDIO & RESPIRATORY > 1b Anaemia and Transfusion > Flashcards

1b Anaemia and Transfusion Flashcards

1
Q

How do we interpret an increase in unconjugated bilirubin?

A

Unconjugated hyperbilirubinemia is caused byproblems with red blood cell stability and survival or by defects in the bilirubin-conjugating enzyme, UGT.

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2
Q

How do we interpret an increase in conjugated bilirubin?

A

In contrast, disorders that result in conjugated hyperbilirubinemia are usually caused by intrinsic liver dysfunction

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3
Q

What is seen on a blood film in a patient with raised unconjugated bilirubin?

A

Round cells that lack central pallor = spherocytes
polychromatic MACROCYTES
high reticulocyte count

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4
Q

What causes hereditary spherocytosis?

A

Disruption of vertical linkages in the membrane, usually due to ankyrin/spectrin

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5
Q

What causes high reticulocytes?

A

Reticulocytosis can be a key indicator that the bone marrow is responding to a need for increased red blood cell production. Causes include anaemia,compensated blood loss or hemolysis and hypoxia

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6
Q

How does the bone marrow respond to haemolytic anaemia?

A

Reticulocytosis - immature red blood cells enter into circulation which then form reticulocytes, and can lead to polychromasia

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7
Q

What is polychromasia?

A

Polychromasia is thepresentation of multicolored red blood cells in a blood smear test. It’s an indication of red blood cells being released prematurely from bone marrow during formation.

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8
Q

Why is there colour seen on the red blood cells in polychromasia?

A

ribosomes still left on the immature blood cells, which are not found on mature red blood cells. These cells still contain a nucleus with genetic material as well due to the early release, which is not needed in mature blood cells because their only function is to carry oxygen in the blood.

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9
Q

What is haemolytic anaemia?

A

Increased destruction with shortened RBC survival and resultant anaemia = haemolysis which leads to a reduction in Hb

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10
Q

What is the treatment for haemolytic anaemia?

A

Folic Acid (because of the increased need)
Splenectomy (to increase the life span of the red blood cells
Vitamin B12

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11
Q

What is the major consequence of haemolytic anaemia?

A

Gallstones

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12
Q

What are the symptoms of gallstones which might present in a patient with haemolytic anaemia?

A

Upper abdominal pain
Tenderness
Jaundice - due to elevated conjugated bilirubin

The gallstones cause obstructive jaundice

Liver is still able to conjugate the bilirubin but it isnt passing from the bile ducts and gall bladder into the duodenum

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13
Q

What type of stones do patients with haemolytic anaemia get?

A

Pigment stones

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14
Q

What are the two possible causes of anaemia?

A

RBC failure of production

RBC excess loss / destruction

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15
Q

What are some of the effects of SLE?

A

Autoimmune

  • Polyarthritis
  • Renal impairment
  • Facial skin rashes
  • Hepatitis
  • Tiredness
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16
Q

What are some of the changes seen to the blood cells when a patient has SLE?

A

Low HB = anaemia
High MCV = macrocytic

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17
Q

What is DAT?

A

Direct anti-globulin test = antibodies that bind to antigens on the erythrocyte membrane in a patient who has developed an auto-antibody

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18
Q

What is DAT used to do?

A

Confirm the presence of autoimmune haemolytic anaemia

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19
Q

What is AIHA?

A

Auto-immune haemolytic anaemia

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20
Q

What is AIHA associated with?

A

Disorders of the immune system = SLE and lymphoma

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21
Q

Outline 4 laboratory evidence of haemolysis?

A

LDH raised
Unconjugated bilirubin
Reduced haptoglobin
Reticulocytosis

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22
Q

Why is raised LDH a sign of hameolysis?

A

LDH is present in red cells and hemolysis causes release into the plasma.

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23
Q

Why is reduced haptoglobin a sign of haemolysis?

A

Haptoglobin is primarily produced in the liver and is functionally important for binding free hemoglobin from lysed red cells in vivo, preventing its toxic effects. Because haptoglobin levels become depleted inthe presence of large amounts of free hemoglobin, decreased haptoglobin is a marker of hemolysis.

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24
Q

What are the 2 categories of haemolytic anaemia?

A
  1. Inherited(RBC defect)
  2. Acquired (RBC environment defect/plasma/vasculature)
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25
Q

Which two conditions are spherocytes present in and what test is used to differentiate between them?

A

Hereditary spherocytosis
Acquired auto-immune haemolysic anaemia

DAT test = positive in AIHA

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26
Q

What environmental factors can cause non-immune haemolysis?

A

Microangiopathic
Malaria
Snake venom
Drugs

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27
Q

What pathway provides energy for the cell?

A

Glycolytic pathway

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28
Q

Which shuttle protects the glycolytic pathway from oxidant damage?

A

Pentose shunt

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29
Q

What enzyme is key in the pentose shunt?

A

G6PD

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30
Q

What is G6PD

A

Glucose-6-phosphate dehydrogenase

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31
Q

What is the HMP shunt tightly coupled to?

A

The metabolism of glutathione - protects from oxidant damage

32
Q

Why is G6PD deficiency a problem?

A

Makes the red cells susceptible to oxidant damage= resulting in haemolysis

33
Q

What blood cell type shows oxidant damage to the red cell?

A

Irregularly contacted cells and Heinz Bodies, Ghost cells

34
Q

What are Heinz Bodies

A

= precipitated oxidised haemoglobin

35
Q

What do the prescence of ghost cells show?

A

intravascular haemolysis

36
Q

What advice would you give to a patient with G6PD Deficiency?

A

Avoid oxidant drugs
Dont eat broad beans
Avoid Naphthalene
be aware that haemolysis can arise from infection

37
Q

A patient is feeling tired, lethargic, breathless at rest which gets worse on exertion, ankle swelling at end of day. Blood count is as follows:

A

Low Hb

Low MCV- microcytic

Low MCH and MCHC- hypochromic

Thrombocytosis

Low ferritin

high transferrin and TIBC + low transferring sat

38
Q

How to differentiate between thalassamia and iron deficiency anaemia?

A

Hb electrophoresis- no high A2 so not thalassaemia

39
Q

What are the clinical symptoms of iron deficiency anaemia

A

Koilonychia - spoon nails
Glossitis
Angular Stomatitis (mouth ulcers)

40
Q

What investigations might be done on a patient who has weight loss but no other symptoms?

A

Investigate for blood in the stool:
* FIT

GI Investigations:
* Upper GI endoscopy - oesophagus, stomach and duodenum
* Take duodenal biopsy
* Colonoscopy

Coeliac antibody testing

41
Q

What are the causes of iron deficiency?

A

Menstrual
Pregnancy
lactation
Vegan
Malnutrition
Vitamin C defiency

42
Q

What is seen on a blood film with patients who have iron defiency?

A

Small cells = microcytosis due to low MCV

Pale cells = hypochromia due to low MCHC

Target cells

pencil cells = elliptocytes

43
Q

What are the differential diagnosis of anaemia associated with a low MCV (microcytic anaemia)?

A

Iron deficiency anaemia

Thalassaemia

Anaemia of chronic disease

44
Q

How is iron deficiency of anaemia treated?

A

Iron deficiency anemia is usually treated in two ways, which involve increasing iron intake and treating any underlying conditions

45
Q

What is the difference between intravascular and extra-vascular haemolysis?

A

Intra = acute damage to the RBC

Extra = removed by the spleen

46
Q

What type of haemolytic anaemia results from a mechanical problem with the entire red blood cell?

A

Microangiopathic haemolytic anaemia (MAHA)

47
Q

How is iron deficient anaemia treated?

A

Iron replacement therapy = ferrous sulphate tablets

48
Q

What happens when ferritin is low?

A

reduced hepcidin production

Increases iron supply

49
Q

What happens to ferritin when transferritin is raised?

A

Ferritin is low

50
Q

What happens to iron absorption when hepcidin is lowered?

A

Absorption of iron from the gut and release of storage iron are increased

51
Q

What is ferritin and what is the significance of this test?

A

Ferritin is a universal intracellular protein that stores iron and releases it in a controlled fashion. Produced in liver.

52
Q

What does a low ferritin indicate?

A

If a ferritin test reveals that your blood ferritin level is lower than normal, it indicates your body’s iron stores are low and you have iron deficiency.

53
Q

What is transferrin and what is the significance of this test?

A

Transferrin is ablood-plasma glycoprotein, which plays a central role in iron metabolism and is responsible for ferric-ion delivery.

54
Q

What does high and low transferritin indicate?

A

If it is low, it means a great proportion of it is bound to iron and little free transferrin is available

If it is high, it means a lot of it is unbound to iron⇒ iron deficiency anaemia

55
Q

What is ESR and what is the significance of this test?

A

AnESR(erythrocyte sedimentation rate test) is a blood test that helps detect inflammation from autoimmune diseases, infection, cancer, and more.

56
Q

What does a high ESR indicate?

A

Anaemia of chronic disease

57
Q

Describe the pathophysiology of ACD.

A

Pro inflammatory cytokines reduce EPO production and upregulate hepcidin. This will reduce RBC production (low EPO), and will reduce FE absorption, transport and availability, which will inhibit cell growth and maturation

58
Q

Which pro-inflammatory cytokines are activated in ACD?

A

IL-1
TNF-alpha
IL-6

59
Q

Which organs is high iron toxic to?

A

Heart and liver

60
Q

How is anaemia of Chronic Disease treated?

A

By treating the underlying disease

61
Q

What is frequently seen in a blood film with patients who have megaloblastic anaemia?

A

Hypersegmented neutrophils
Poikilocytosis (oval shaped)
megaloblasts

LOW HB

HIGH MCV- MACROCYTIC

LOW PLATELETS, WBC

HIGH LDH + UNCONJUGATED BILIRUBIN (HAEMOLYSIS)

62
Q

What can cause megaloblastic anaemia?

A

Vitamin B12 / folate deficiency

63
Q

What are megaloblasts?

A

Abnormally large nucleated red cell precursers with an immature nucleus compared to cytoplasm
(impaired DNA synthesis and cell division)

64
Q

Why does folate and B12 deficiency lead to megaloblastic anaemia?

A

needed for dTTP synthesis which is needed to make thymidine which is needed for DNA synthesis = therefore cannot make DNA, and nuclear maturation cannot occur

deficiency but cells cannot divide but continue to grow = macrocytosis

65
Q

Which drugs can cause megaloblastic changes?

A

Aziothioprine
Cytotoxic chemo
Folate antagonists = methotrexate

66
Q

What is pernicious anaemia?

A

lack of IF - therefore B12 cannot be absorbed, therefore megaloblastic anaemia

67
Q

How is folic acid deficiency treated?

A

oral supplements

68
Q

What are the common causes of microcytic anaemia?

A

Defect in haem synthesis and defect in globin synthesis

69
Q

Which two conditions are a result of a defect in haem synthesis?

A

iron deficiency anaemia and anaemia of chronic disease

70
Q

What is the only blood test result which is high in iron deficiency anaemia?

A

Transferrin

71
Q

What are the mechanisms of normocytic anaemia?

A

Recent blood loss
failure of production of red cells
Pooling of red blood cells in the spleen

72
Q

What is a reason the MCV might be raised?

A

reticulocytosis as younger cells are larger than older cells

73
Q

How to treat dietary Vitamin B12 deficiency?

A

Oral supplements

74
Q

How to treat Intrinsic Factor Deficiencies which leads to Vitamin B12 defiency?

A

Hydroxocobalamin Injections (manufactured version of vitamin B12)

75
Q

What might be some gastric causes of Vitamin B12 deficiency?

A

Gastrectomy, so less IF can bind
Autoimmune = Pernicious Anaemia (Where you have anti-gastric parietal cells and IF antibodies)

76
Q

What are some bowel related causes of vitamin B12 defiency?

A

Crohn’s disease
Ileal Resection

treat with hydroxocobalamin injections (IM)

77
Q

What are the neurological requirements of folic acid and vitamin B12?

A

needed for the development of the neural tube, can lead to defects

SACD - Sub-acute combined degenration of the spinal cord

BRS CARDIO & RESPIRATORY (26 decks)

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