B3 L41/42: Rheumatology Flashcards
Many types of arthritis. What are 4 factors that diagnosis dependent on?
- History of symptoms
- Signs present
- Investigations
- Inflammatory joints with or without associated features should trigger your referral
What is rheumatoid arthritis?
Chronic systemic, destructive, inflammatory arthropathy of unknown aetiology
What is the cause of RA?
unknown aetiology
What is the prevalence of RA?
1-2%
Are males or females more affected by RA? What is the ratio?
Females (3:1)
What are the 2 peak onsets for RA?
Peak onset 55 years
○ Late childbearing years. Post partum - high risk of RA.
○ Second peak : 60-80 yo
Is RA disabling? What is the ratio of people who stop work 5 years after diagnosis?
Yes –> 20%
How many years does RA reduce life expectancy by?
7-10 years
What are the 3 Pathogenesis of RA?
• Family predisposition
○ First degree relative with RA (RR 1.5)
○ Monozygotic twins 12-15% concordance
• Genetics
○ RA strongly linked to MHC Class II antigens
○ HLA DRB10404
○ HLA DRB10401
• Environment
○ Smoking associated, anti-oxidants/pregnancy/alcohol is protective because dampening immune system?
○ Other triggers? Infections, microbiota, silica dust
What are 7 criteria in the diagnosis of RA-
American College of Rheumatology (ACR) Criteria 1986 (old classification criteria)?
- Morning stiffness > 1hr
- Three or more joints
- Smaller hand or feet joints
- Symmetrical distribution
- Positive Rheumatoid factor (and/or Anti CCP)
- Rheumatoid nodules
- X-ray changes (plus MRI, CT, US)
4/7 criteria and >6 weeks duration
What are 7 criteria in the diagnosis of RA- 2010 ACR/EULAR Classification Criteria for RA (current classification criteria)
- Score >6 = definite RA
- Better sensitivity & specificity for all stages of RA
- 1 or more joint definite synovitis (not explained by another disease)
- Joints small or large
- RF and anti-ccp (ACPA)
- CRP and ESR - markers of inflammation in blood
- Duration of symptoms - minumum 6/52 for diagnosis
What are 16 Clinical Features of RA?
- Pain and swelling on the affected joints
- Local tenderness to palpation and with ROM
- Classical “boggy” feeling to the joint (hard plasticine feeling?)
- Heat and redness of joint
- Thickening of tendons – tenosynovitis
- Nodules on tendons – triggering/rupture
- Reduced grip strength - RA specific symptom
- Ulnar deviation of fingers
- Boutonnière and Swan neck deformities in late RA
- Radial drift of carpals
- Prominence of ulnar styloid
- Fixed flexion at elbow - not specific to RA
- Frozen shoulder
- Retrocalcaneal bursitis - tarsal tunnel syndrome
- Knee effusions
- Baker’s cysts
- Hip and CV spine in established RA only
What are 5 Typical/Classical Clinical Features of RA?
- Polyarticular disease
- Gradual onset - weeks to months
- Predominant symptoms being pain, stiffness and swelling of many joints
- Morning stiffness (= inflammation) very common, slowness to move.
- 1/3 have systemic features including myalgia, fatigue, low grade fever, fatigue, weight loss and low mood
What are 3 Palindromic Onset
Clinical Features of RA?
- Episodic symptoms with several joints being affected for hours to days
- Symptom free periods may last days to months
- Hard to diagnose - patient might think it’s due to other injury? Need to take a proper history.
What are 4 Monoarthritis (rare)
Clinical Features of RA?
- Persistent single joint arthritis
- Frequently large joints; knee, shoulder, hip, wrist (in old women)
- Sole manifestation or herald the onset of polyarticular disease
- Often a history of trauma/initiating event
What are 6 Extra-articular manifestations of RA?
- Cardiovascular: Pericarditis, myocarditis - death.
- Respiratory: Pleuritis, intrapulmonary nodules, rheumatoid pneumoconiosis, diffuse interstitial fibrosis
- Neurological: Peripheral sensory neuropathy, Entrapment neuropathies, Cervical myelopathy
- Ocular: Episcleritis/scleritis and sicca symptoms
- Skin: Subcutaneous nodules. Vasculitis.
- Haematological: Anaemia, Splenomegaly, Felty’s syndrome
What is a respiratory extra-articular manifestations of RA?
Pleuritis, intrapulmonary nodules, rheumatoid pneumoconiosis, diffuse interstitial fibrosis
What is a neurological extra-articular manifestations of RA?
Peripheral sensory neuropathy, Entrapment neuropathies, Cervical myelopathy
What is an ocular extra-articular manifestations of RA?
Episcleritis/scleritis and sicca symptoms
What is a skin extra-articular manifestations of RA?
Subcutaneous nodules. Vasculitis.
What is a haematological extra-articular manifestations of RA?
Anaemia, Splenomegaly, Felty’s syndrome
What is a cardiovascular extra-articular manifestations of RA?
Pericarditis, myocarditis - death.
What are 3 things found in a blood test of RA?
- FBC, e/LFTs, ESR/CRP
- Rheumatoid factor (non-specific for RA)
- Anti-CCP antibodies (98% specific for RA)
- We test both RA factor and anti-CCP. If both present, then worse prognosis.
What are 3 things found in imaging of RA?
• X-rays: RA affects wrist & MCP, maybe PIP, never DIP. Erosion at joints, dislocation/subluxation, loss of joint space
○ Baseline hands and feet, other joints if indicated.
○ CXR.
• MRI: Early synovitis, early erosion (can’t see on X-ray), bone marrow oedema, tenosynovitis.
• Ultrasound: Rotator cuff/tendinopathy