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Z Year 2 BRS MSK > Connective Tissue Disorders > Flashcards

Connective Tissue Disorders Flashcards

1
Q

What are the key CTDs?

A
  1. SLE
  2. Sjogren’s synfrome
  3. Autoimmune inflammatory muscle disease
  4. Systemic sclerosis (scleroderma)
  5. Overlap syndromes
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2
Q

What are the types of autoimmune inflammatory muscle disease?

A
  • Polymyositis

* Dermatomyositis

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3
Q

What are the types of scleroderma?

A
  • Diffuse cutaneous

* Limited cutaneous

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4
Q

What is RA?

A

Chronic joint inflammation that can result in joint damage

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5
Q

What is the site of inflammation in RA?

A

synovium

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6
Q

What are the associated autoantibodies in RA?

A
  1. Rheumatoid factor

2. Anti-cyclic citrullinated peptide (CCP) antibodies

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7
Q

What is ankylosing spondylitis?

A

Chronic spinal inflammation that can result in spinal fusion and deformity

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8
Q

What is the site of inflammation in ankylosing spondylitis?

A

enthesis

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9
Q

What are the antibodies in ankylosing spondylitis?

A

No autoantibodies (‘seronegative’)

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10
Q

What are the seronegative spondyloarthropathies?

A
  1. Ankylosing spondylitis
  2. Reactive Arthritis (Reiters syndrome)
  3. Arthritis associated with psoriasis (psoriatic arthritis)
  4. Arthritis associated with gastrointestinal inflammation (enteropathic synovitis)
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11
Q

What is SLE?

A

chronic tissue inflammation in the presence of antibodies directed against self antigens

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12
Q

Where does SLE affect?

A

multi-site inflammation but particularly the joints, skin and kidney

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13
Q

What are the associated auto-antibodies in SLE?

A
  1. Antinuclear antibodies
  2. Anti-double stranded DNA antibodies
  3. Anti-phospholipid antibodies
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14
Q

What are connective tissue diseases?

A
  1. Systemic lupus erythematosus
  2. Sjogren’s syndrome
  3. Autoimmune Inflammatory muscle disease
  4. Systemic sclerosis (scleroderma)
  5. Overlap syndromes
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15
Q

What type of disease are typically non-erosive?

A

arthralgia and arthritis

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16
Q

Why are serum autoantibodies useful?

A
  • May aid diagnosis
  • Correlate with disease activity
  • May be directly pathogenic
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17
Q

What is Raynaud’s phenomenon?

A
  • in CTDs

- intermittent vasospasm of digits on exposure to cold

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18
Q

What are the colour changes in Raynaud’s phenomenon?

A
  • Typical colour changes – white to blue to red
    1. Vasospasm leads to blanching of digit
    2. Cyanosis as static venous blood deoxygenates
    3. Reactive hyperaemia
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19
Q

Is Raynaud’s usually isolated?

A

most commonly isolated and benign condition (‘Primary Raynaud’s phenomenon’)

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20
Q

When is SLE usually diagnosed?

A

prototypic autoimmune disease typically diagnosed in female aged between 15 – 45 years

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21
Q

What are the wide-ranging clinical manifestations for SLE?

A
  1. Malar rash – erythema that spares the nasolabial fold
  2. Photosensitive rash
  3. Mouth ulcers
  4. Hair loss
  5. Raynaud’s phenomenon
  6. Arthralgia and sometimes arthritis
  7. Serositis (pericarditis, pleuritis, less commonly peritonitis)
  8. Renal disease – glomerulonephritis (‘lupus nephritis’)
  9. Cerebral disease – ‘cerebral lupus’ e.g. psychosis
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22
Q

What is the current paradigm of SLE?

A
  1. Apoptosis leads to translocation of nuclear antigens to membrane surface
  2. Impaired clearance of apoptotic cells results in enhanced presentation of nuclear antigens to immune cells
  3. B cell autoimmunity
  4. Tissue damage by antibody effector mechanisms e.g. complement activation and Fc receptor engagement
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23
Q

What are the key autoantibodies in RA?

A

1, Rheumatoid Factor
2. Anti-cyclic citrullinated peptide antibody
also termed antibodies to citrullinated peptide antigens (ACPA)

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24
Q

What are the key autoantibodies in SLE?

A
  1. Antinuclear antibodies (ANA)
  2. Anti-double stranded DNA antibodies (anti-dsDNA)
  3. Anti-phospholipid antibodies
    also termed anti-cardiolipin antibodies and associated with risk of arterial and venous thrombosis in SLE; may also occur in absence of SLE in what is termed the ‘primary anti-phospholipid antibody syndrome’
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25
Q

What are the key autoantibodies in OA?

A

none

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26
Q

What are the key autoantibodies in Reactive Arthritis?

A

none

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27
Q

What are the key autoantibodies in gout?

A

none

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28
Q

What are the key autoantibodies in ankylosing spondylitis?

A

none

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29
Q

What are the key autoantibodies in systemic vasculitis?

A

antinuclear cytoplasmic antibodies (ANCA)

30
Q

If ANA is positive the clinical laboratory what further tests to determine which type of ANA it is – typically these include screening for?

A
  1. Anti-Ro
  2. Anti-La
  3. Anti-centromere
  4. Anti-Sm
  5. Anti-RNP
  6. Anti-ds-DNA antibodies
  7. Anti-Scl-70
31
Q

What are cytoplasmic antibodies?

A
  1. Anti-tRNA synthetase antibodies

2. Anti-ribosomal P antibodies

32
Q

What is the significance of ANA in SLE?

A
  1. Seen in all SLE cases

2. Not specific for SLE

33
Q

What is the significance of anti-dsDNA in SLE?

A
  1. Specific for SLE

2. Serum level of antibody correlated with disease activity

34
Q

What is the significance of anti-phospholipid antibodies (also termed anti-cardiolipin antibodies) in SLE?

A
  1. associated with risk of arterial and venous thrombosis in SLE
  2. may also occur in absence of SLE in what is termed the ‘primary anti-phospholipid antibody syndrome
35
Q

What is the significance of anti-sm antibodies in SLE?

A
  1. Specific for SLE

2. Serum level of antibody does NOT correlate with disease activity

36
Q

What is the significance of Anti-Ro and Anti-La antibodies in SLE?

A
  1. Secondary to Sjogren’s syndrome

2. Neonatal lupus syndrome (transient rash in neonate, permanent heartblock)

37
Q

What is the significance of anti-ribosomal P antibodies in SLE?

A

Cerebral lupus

38
Q

What are the investigations for inflammation in SLE?

A
  1. high ESR

2. C-reactive protein is typically normal unless infection or serositis/arthritis

39
Q

What are the investigations for haematology in SLE?

A
  1. Haemolytic anaemia
  2. Lymphopenia
  3. Thrombocytopenia
40
Q

What are the investigations for renal in SLE?

A
  1. very important to measure urine protein (most commonly urine protein:creatinine ratio [uPCR])
  2. look at albumin
41
Q

What are the investigations for immunological in SLE?

A
  1. Antinuclear antibodies
  2. Anti-double-stranded DNA antibodies - highly specific, correlate with disease activity
  3. Complement consumption – e.g. low C4 and C3
42
Q

What are the investigations for clotting in SLE?

A

-antiphospholipid antibodies

•Lupus anticoagulant and anti-cardiolipin antibodies

43
Q

What can happen with SLE investigations in treated patients?

A
  • In treated patients SOME changes may reflect ADVERSE REACTIONS TO MEDICATION
  • e.g. abnormal liver function (‘transaminitis’) or fall in neutrophil count (neutropenia)
44
Q

What are the complement C3 and C4 levels in unwell lupus patients?

A
  1. Low complement C3 and C4

2. High levels of anti-ds-DNA antibodies

45
Q

What is the aim of treatment in SLE?

A

remission or low disease activity and prevention of flares

46
Q

What medication is used in SLE treatment?

A
  1. Hydroxychloroquine recommended in all patients with lupus

2. Maintenance treatment glucocorticoids should be minimised and, when possible, withdrawn

47
Q

What can help discontinuation of glucoricosteroids in SLE?

A
  1. initiation of immunomodulatory agents (methotrexate, azathioprine, mycophenolate)
  2. expedite the tapering/discontinuation of glucocorticoids
48
Q

What medication is used in persistently active or severe disease?

A

use cyclophosphamide and B cell targeted therapies (rituximab and belimumab)

49
Q

What else is needed in the management of SLE?

A
  1. Patients with SLE should be assessed for their antiphospholipid antibody status
  2. Patients with SLE should be assessed for their infectious and cardiovascular diseases risk profile
  3. Pregnancy planning
50
Q

What happens in Sjogren’s syndrome?

A
  1. Autoimmune exocrinopathy

2. lymphocytic infiltration of especially exocrine glands and sometimes of other organs (extra-glandular involvement)

51
Q

What does the exocrine pathology is Sjogren’s syndrome result in?

A
  1. Dry eyes (xerophthalmia)
  2. Dry mouth (xerostomia)
  3. Parotid gland enlargement
52
Q

What is the commonest extra-glandular manifestation in sjogren’s syndrome

A
  • non-erosive arthritis

- Raynaud’s phenomenon

53
Q

When is it called ‘secondary’ sjogren’s syndrome?

A

occurs in context of another connective tissue disorder e.g. SLE

54
Q

What does a salviary gland biopsy in sjogren’s syndrome show?

A

lymphocytic infiltration predominantly CD4 helper T cells and to lesser extent B lymphocytes

55
Q

What is schimer’s test in sjogren’s syndrome?

A
  1. a test to assess tear production
  2. filter paper is placed under lower eyelid and extent of wetness measured after 5 minutes
  3. abnormal is <5mm after 5 minutes
56
Q

What is inflammatory muscle disease?

A

proximal muscle weakness due to autoimmune-mediated inflammation either with (dermatomyositis) or without (polymyositis) a rash

57
Q

What are the skin changes in dermatomyositis?

A
  1. Lilac-coloured (heliotrope) rash on eyelids, malar region and naso-labial folds
  2. Red or purple flat or raised lesions on knuckles (Gottron’s papules)
  3. Subcutaneous calcinosis
  4. Mechanic’s hands (fissuring and cracking of skin over finger pads)
58
Q

What is the histopathology of inflammatory muscle disease?

A
  1. Elevated CPK (creatine phosphokinase)
  2. abnormal electromyography
  3. abnormal muscle biopsy (polymyositis = CD8 T cells; dermatomyositis = CD4 T cells in addition to B cells)
59
Q

What is inflammatory muscle disease associated with?

A

malignancy (10-15%) and pulmonary fibrosis

60
Q

What is crest?

A
  1. sub-type of limited systemic sclerosis
  2. Calcinosis
  3. Raynaud’s phenomenon
  4. Esophageal dysmotility
  5. Sclerodactyly
  6. Telangiectasia
61
Q

What is systemic sclerosis?

A
  • Thickened skin with Raynaud’s phenomenon

* Dermal fibrosis, cutaneous calcinosis and telangiectasia

62
Q

What are the features of diffuse systemic sclerosis?

A
  1. Fibrotic skin proximal to elbows or knees (excluding face and neck)
  2. Anti-topoisomerase-1 (anti-Scl-70) antibodies
  3. Pulmonary fibrosis, renal (thrombotic microangiopathy) involvement
  4. Short history of Raynaud’s phenomenon
63
Q

What are the features of limited systemic sclerosis?

A
  1. Fibrotic skin hands, forearms, feet, neck and face
  2. Anti-centromere antibodies
  3. Pulmonary hypertension
  4. Long history of Raynaud’s phenomenon
64
Q

What is overlap syndrome?

A

features of more than 1 connective tissue disorder are present e.g. SLE and inflammatory muscle disease

65
Q

What is undifferentiated CTD?

A

incomplete features of a connective tissue disease are present

66
Q

What is mixed connective tissue disease?

A
  1. group of patients with features of seen in SLE, scleroderma, rheumatoid arthritis, and polymyositis were identified by the presence of an autoantibody:
  2. Anti-U1-RNP antibody*
67
Q

What are the key autoantibodies in diffuse systemic sclerosis?

A

Anti-scl-70 antibody (also termed antibodies to topoisomerase-1)

68
Q

What are the key autoantibodies in limited systemic sclerosis?

A

anti-centromere antibodies

69
Q

What are the key autoantibodies dermato-/polymyositis?

A
  1. Anti-tRNA transferase antibodies

2. . E.g. histidyl transferase (also termed anti-Jo-1 antibodies)

70
Q

What are the key autoantibodies in sjogren’s syndrome?

A
  • No unique antibodies but typically see
    1. ANA (anti-Ro and anti-La antibodies)
    2. RF
71
Q

What are the key autoantibodies in mixed connective tissue disease?

A

Anti-U1-RNP antibodies

Z Year 2 BRS MSK (18 decks)

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