Flashcards in SYSTEMIC LUPUS ERYTHMATOSUS Deck (43)
Which virus has been implicated as a possible trigger for SLE?
Define systemic lupus erythmatosus.
Systemic lupus erythematosus (SLE) is a heterogeneous, inflammatory, multisystem autoimmune disease in which antinuclear antibodies occur (often years before clinical symptoms).
What are the defects in SLE?
Failure of self tolerance by the T and B cells
Defects in apoptosis system
To make a positive diagnosis of SLE what are the antibodies that we are looking?
Anti-nuclear antibodies (ANA)
Are ANA's specific to SLE?
No. The different subtypes are present in a number of connective tissue disorders including Sjögren's syndrome, scleroderma, mixed connective tissue disease, polymyositis, dermatomyositis, autoimmune hepatitis and drug induced lupus.
What is c1q?
It is a subtype of compliment involved in clearing debris of apoptosic cells.
How might a patient with suspected SLE present? (Name 3 symptoms)
Are CRP and ESR both classically raised in SLE?
No. Normally only ESR is raised. However, if there is infection at the time, then CRP may well be raised.
What are some of the monoclonal antibodies that are used in the treatment of SLE?
Erpratuzamab - currently undergoing trials
What is the peak age for females to develop symptoms of SLE?
What is the peak age for males to develop symptoms of SLE?
What is the ratio of women to men in terms of those affected by SLE?
10:1 - 5:1
What are the risk factors for developing SLE?
Certain HLA-DRB1 types e.g DR3 and DR2
Defective C4 complement gene - develop a lupus-like illness
What are the drugs that can induce Lupus?
Chlorpromazine - antipsychotic
Methyldopa - Parkinson's
Hydralazine - Anti-hypertensive
Isoniazid - TB
d-Penicillamine - Immunosuppressive for RA
Minocycline - broad spectrum tetracycline antibiotic
How might someone with suspected SLE present to their GP?
Arthralgia with early morning stiffness
Photosensitive skin rashes - malar rash, urticaria
Pleuritic chest pain
Mild hair loss
What part of the face does the classic malar rash seen in SLE not affect?
What is Raynaud's phenomenon?
Excessively reduced blood flow in response to cold or stress, causing discoloration (white then blue then red) of fingers.
Which connective tissue disorders are associated with Raynaud's phenomenon?
Systemic lupus erythematosus
Mixed connective tissue disease
Cold agglutinin disease
What is the possible underlying pathophysiology of SLE?
Apoptotic cells and cell fragments inefficiently cleared by phagocytes.
They are then transferred to lymphoid tissue- taken up by APCs.
Self antigens including nuclear constituents eg: DNA and histones- these are presented to T cells- they stimulate B cells to produce auto-antibodies.
Clinical manifestations due to antibody formation and development and deposition of immune complexes, complement activation and influx of neutrophils and abnormal cytokine production.
Specifically which cytokines are increased in serum concentration in SLE?
Which population (in terms of race) is most at risk of developing SLE?
What is discoid lupus?
A benign variant of SLE where only the skin is involved. So facial rash with erythematous plaques.
What are the 11 parts of the diagnostic criteria of SLE and how many does the criteria require the patient to have?
1) Malar flush
2) Discoid rash
4) Oral ulcers
5) Non erosive arthritis
7) Renal disorder
8) CNS disorder
9) Haematological disorder
10) Immunological disorder
11) Antinuclear antibody (+ve in >95%)
4 or more of the 11
On examination what signs might you pick up in someone with suspected SLE?
Very non specific
Any signs associated with complications of SLE
What investigations would you order for someone with suspected SLE?
Other investigations depending on involvement from specific body parts.
What might the FBC reveal in someone with suspected SLE?
Normochromic, normocytic anaemia.
What pattern of results with regard to ESR and CRP would you expect to see in someone with SLE?
ESR raised but normal CRP unless there is intercurrent infection or serositis.
What is the most sensitive autoantibody present in patients with SLE, with 95% of all patients having this auto-antibody?
Which auto-antibody can be used to reflect disease activity in the 70% of SLE patients that have this auto-antibody?
Anti-dsDNA - high specificity but only 70% sensitivity.
A rise in antibody titre might indicate that immunosuppression needs to be increased.