Primary Immune Deficiencies Flashcards Preview

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Flashcards in Primary Immune Deficiencies Deck (55)
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1

Selective IgA Deficiency - what type of infections? epidemiology?

Most Common defiency Recurrent gastro and resp infections affects 1/600 Caucasians but 70% are asymptomatic

2

Complement Deficiencies - Treatment?

Vaccination, prophylactic Abx, high levels of suspicion, screen family members

3

Leukocyte Adhesion Deficiency- what is it? deficiency in?

Failure to express leukocyte adhesion markers. Deficiency of the beta-2 integrin subunit (CD18) of the Leukocyte adhesion molecule in LAD1 LAD2 is much rarer and has severe growth restriction and mental retardation

 

4

B cell deficiencies - Consequences

Increased susceptibility to bacterial and some viral infections and toxins (tetanus, diphtheria)

5

Cyclic Neutropenia - what causes it?

caused by mutations in the ELA1 gene

6

Kostmann Syndrome - Treatment?

Treatment includes G-CSF, prophylactic antibiotics and BMT if G-CSF is ineffective

7

IgM immunity?

on surface of B cells

8

Chronic Granulomatous Disease - associated diseases?

PLACESS Pseudomonas Listeria Aspergillus Candida E. coli Staph aureus Serratia patients can resist catalase-negative bacteria

9

Severe Combined Immune Deficiency (SCID) - defect in? blood results?

defect in lymphoid precursors (IL2-R), leading to low or normal B cells, reduced T cells and low antibodies

10

DiGeorge's Syndrome - what is it?

Impaired development of the 3rd and 4th pharyngeal pouches (oesophagus, thymus, heart)

11

Hyper-IgM Syndrome - chromosome? defect in? how does it cause symptoms?

X-Linked Condition - Xq26 CD40L, CD40, AlCDA or CD154 defect Activated T cells can't interact with B-cells to class switch therefore B cells can't make IgA and IgG but instead IgM levels increases

12

T cell deficiencies - Consequences

Increased susceptibility to viral, fungal and bacterial infections and early malignancy

13

Common Variable Immune Deficiency - signs/symptoms/diagnosis

Frequent infections during early life, increased incidence of autoimmune or inflammatory manifestations, granulomata and increased susceptibility to cancer. Both males and females can get the deficiency, most likely to be diagnosed in 3rd/4th decade of life although 20% are found to be immunodeficient in childhood

14

Cyclic Neutropenia - Treatment

Treat with G-CSF

15

Brutons Agammaglobinemia - symptoms and age of onset?

recurrent and severe bacterial infections from 3-6 months old when maternal IgG denature. Most common infections are • Ear infections • Sinusitis • Pneumonia • Diarrhea due to a parasite called Giardia

16

Ig half life?

18 days

17

2 syndromes of T cell deficiencies?

Bare Lymphocyte Syndrome DiGeorge's Syndrome

18

Common Variable Immune Deficiency - Ig levels? cause?

Low IgG, IgE and IgA many genetic causes

19

Complement Deficiencies - Lectin Pathway Deficiency

Very common, 10% are MBL deficient. Not so clinically important

20

IgG immunity?

can cross from placenta to foetus

21

IgA immunity?

Mucosal areas, saliva, tears, breast milk

22

Reticular Dysgenesis - is a form of what deficiency? causes a deficiency in what? treatment?

most severe form of SCID (Severe Combined Immune Deficiency) (AK2) Causes an absolute deficiency in Neutrophils, Lymphocytes, Monocytes/ Macrophages, Platelets Fatal in v. early life unless treated by BMT

23

Kostmann Syndrome - what is it? dominant or recessive? prevalence?

A severe congenital neutropenia (increased risk of infection) Mainly Autosomal Recessive (HAX-1) 1-2cases per million

24

Chronic Granulomatous Disease - treatment?

Treatment involves prophylactic Trimethoprim and Itraconazole and Interferon. Sometimes use stem cell transplant

25

DiGeorge's Syndrome - what chromosome?

deletion of 22q11.2

26

Chronic Granulomatous Disease - what test is used to diagnose?

Negative Nitro-Blue Tetrazolium (NBT) test. NBT is a dye that changes colour from yellow to blue following interaction with hydrogen peroxide. Also use Dihydrorhodamine (DHR) flow cytometry test. DHR is oxidised to rhodamine, which is strongly fluorescent, following interaction with hydrogen peroxide

27

B cell deficiencies - Treatment

Ig replacement BMT in some situations vaccination (not effective except in IgA deficiency)

28

Leukocyte Adhesion Deficiency - features of disease

High neutrophil count and delayed umbilical cord separation

29

Which cytokines/receptors can we be deficient in? What are these molecules all involved in?

Deficiencies in IFN-gamma, IFN-gamma receptor, IL-12 and IL_12 receptor. all involved in signalling between T-cells and macrophages to stimulate TNF and activate NADPH oxidase

30

4 Phagocyte deficiencies?

Kostmann Syndrome Leukocyte Adhesion Deficiency Chronic Granulomatous Disease Cyclic Neutropenia