Rheumatology Flashcards
Rheumatoid Arthritis
what is it
an autoimmune condition that causes chronic inflammation of the synovial lining of the joints, tendon sheaths and bursa
it is an inflammatory arthritis
symmetrical polyarthritis
Rheumatoid Arthritis
what does symmetrical polyarthritis mean
symmetrical and affects multiple joints
Rheumatoid Arthritis
epidemiology
F>M
middle age
Rheumatoid Arthritis
which gene is often present in RF positive patients
HLA DR4
Rheumatoid Arthritis
which gene is occasionally present in RA patients
HLA DR1
Rheumatoid Arthritis
antibodies
- Rheumatoid Factor (RF)
- Cyclic citrullinated peptide antibodies (anti-CCP antibodies)
Rheumatoid Arthritis
what is RF
an autoantibody that targets the Fc portion of the IgG antibody
which causes activation of the immune system against the patient’s own IgG causing systemic inflammation
RF is most often IgM but can be any class of immunoglobulin
Rheumatoid Arthritis
what are anti-CCP antibodies
Cyclic citrullinated peptide antibodies are autoantibodies that are more sensitive and specific to RA than RF
Rheumatoid Arthritis
Key symptoms
- symmetrical distal polyarthropathy
- joint pain, swelling and stiffness
- worse after rest but improves with activity
Rheumatoid Arthritis
systemic symptoms
- fatigue
- weight loss
- flu like illness
- muscle aches and weakness
Rheumatoid Arthritis
what is Palindromic Rheumatism
self limiting short episodes of inflammatory arthritis with joint pain, stiffness and swelling typically affecting only a few joints
this episode only lasts 1-2d then completely resolves
having positive RF + anti-CCP indicate it will progress to full RA
Rheumatoid Arthritis
which joints are NOT affected
distal interphalangeal joints
Rheumatoid Arthritis
common joints affected
- PIP
- MCP
- wrist + ankle
- Metatarsophalangeal joints
- cervical spine
- large joints also: knee, hips, shoulders
Rheumatoid Arthritis
what is Atlantoaxial Subluxation
occurs in the cervical spine
the axis (C2) and the odontoid peg shift within the atlas (C1)
Rheumatoid Arthritis
what causes Atlantoaxial Subluxation
local synovitis and damage to the ligaments and bursa around the odontoid peg of the axis and the atlas
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why is RA relevant in anaesthetics and intubation
Subluxation can cause spinal compression
MRI scan can visualise changes in these areas as part of pre-op assessment
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what gives the joints a ‘boggy’ feeling
palpation of the synovium in around joints when the disease is active will give this feeling related to inflammation and swelling
Rheumatoid Arthritis
signs in the hands (4)
- Z shaped deformity to the thumb
- Swan neck deformity
- Boutonnieres deformity
- Ulnar deviation of the fingers at the knuckle (MCP joints)
Rheumatoid Arthritis
what is Swan neck deformity
hyperextended PIP with flexed DIP
Rheumatoid Arthritis
what is Boutonnieres deformity
hyperextended DIP and flexed PIP
due to a tear in the central slip of the extensor component of the finger
the flexor digitorum superficialis tendons (lateral tendons that go around the PIP) pull on the distal phalynx without any other supporting structure
Rheumatoid Arthritis
important extra-articular manifestations (4)
- pulmonary fibrosis with pulmonary nodules (Caplan’s syndrome)
- bronchiolitis obliterans: inflammation causing small airway destruction
- Felty’s syndrome: RA, neutropenia, splenomegaly
- Secondary Sjogren’s Syndrome aka sicca syndrome
Rheumatoid Arthritis
other extra-articular manifestations (7)
- anaemia of chronic disease
- CVS disease
- episcleritis + scleritis
- rheumatoid nodules
- lymphadenopathy
- carpal tunnel syndrome
- amyloidosis
Rheumatoid Arthritis
inx
- clinical
- RF
- if RF -ve, check anti-CCP antibodies
- CRP, ESR
- X-ray of hands and feet
- USS: synovitis
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x-ray changes
- joint destruction and deformity
- soft tissue swelling
- periarticular osteopenia
- bony erosions