Rheumatology Flashcards
Rheumatoid Arthritis
Functions of Synovium (4)
Maintenance of intact tissue surface
Lubrication of cartilage
Control of synovial fluid volume and composition (neutrophils in acute flares)
Nutrition of chondrocytes within joints
Rheumatoid Arthritis
Effect on joint (4)
Erosion into corner of bone
Thinning of cartilage
Inflamed tendon sheath
Inflamed synovium spreading across joint surface
Rheumatoid Arthritis
Definition (2)
A chronic symmetric polyarticular inflammatory joint disease
The rheumatoid synovial fluid contains neutrophils in acute flares and can cause bone and cartilage destruction
Rheumatoid Arthritis
Autoimmunity (4)
Evidence of autoimmunity can be present many years before onset of clinical arthritis
Autoantibodies such as RFs and anti-citrullinated protein antibodies are associated with RA
The autoantibodies recognise either joint antigens or systemic antigens
Autoantibodies activate a complement
Rheumatoid Arthritis
Cells involved in disease perpetuation (4)
Cytokine networks involving TNF-am IL-6 and B-cells participate in disease perpetuation
Osteoclasts and fibroblast-like synoviocytes mediate bone and cartilage destruction
Inflammatory cytokines promote angiogenesis and autoantibody production and activate leukocytes
IL-6 mediates systemic effects
Rheumatoid Arthritis
Signs + symptoms
Typical presentation: symmetrical swollen, painful and stiff small joints, worse in morning and can fluctuate and effect larger joints Tenosynovitis/bursitis Later there is joint damage and deformity: ulnar deviation of fingers and dorsal wrist subluxation, Boutonniere and swan neck finger deformity or Z-deformity of thumbs Pain Immobility Stiffness Systemic symptoms Swelling Tenderness Redness Heat Limitation of movement
Rheumatoid Arthritis Systemic consequences (9)
Vasculitis Nodules (elbows + lungs) Scleritis Raynaud's Carpal tunnel syndrome Osteoporosis Amyloidosis Anaemia of chronic disease Increased risk of cardiovascular disease as atherosclerosis is accelerated
Rheumatoid Arthritis
Investigations (7)
Rheumatoid factor (+ve 70%)
Anticyclic citrullinated peptide (anti-CCP) highly specific (98%)
High platelets
High ESR
High CRP
X-ray (LESS)
Ultrasound and mRI better at identifying synovitis
Rheumatoid Arthritis
X-ray findings (4)
Loss of joint space
Erosions
Soft tissue swelling
Soft bones (osteopenia)
Rheumatoid Arthritis
Disease activity score (3)
DAS28 used to measure activity
Assesses tenderness and swelling at 28 joints, ESR and patient’s self-reported symptom severity
Aim to reduce score to <3
Rheumatoid Arthritis
Treatment (4)
Early use of DMARDs and biologics improves long-term outcomes
Steroids: rapidly reduce symptoms and inflammation
NSAIDs: good for symptom relief
Physio and OT
Rheumatoid Arthritis
DMARDs (4)
1st line
Take 6-12 weeks for symptomatic benefit
Eg. methotrexate, sulfasalazine, ,hydroxychloroquine
Causes: immunosuppression (can result in pancytopenia, increased susceptibility to infection and neutropenic sepsis so regular FBC monitoring required)
Rheumatoid Arthritis
Biologics (6)
1st anti-TNF adalimumab
Start biologics after failure, intolerance to at least 2 DMARDs
2nd ani-TNF infliximab, etanercept
3rd B cell depletion rituximab
4h anti IL-1 or IL-6 eg. tocilizumab (anti IL-6) or anakinra (anti IL-1)
5th T cell co-stimulator inhibitor eg. abatacept
Septic Arthritis
Routes of infection (3)
Haematogenous
Eruption of bone abscess
Direct invasion- penetrating wound, athroscopy, indwelling IV
Septic Arthritis
Organisms (4)
Staph aureus
Streptococci
Neisseria gonococcus
Gram -ve bacilli
Septic Arthritis
Pathology (3)
Acute synovitis with purulent joint effusion
Articular cartilage attacked by bacterial toxin and cellular enzymes
Complete destruction of articular cartilage
Septic Arthritis Risk factors (8)
Pre-existing joint disease (especially RA) Diabetes Immunocompromised Chronic renal failure Recent joint surgery Prosthetic joints IVDU Age >80
Septic Arthritis
Signs + symptoms (2)
Knee affected in >50% of cases
Acutely inflamed joint
Septic Arthritis Differential diagnoses (4)
Acute osteomyelitis
Trauma
Rheumatic fever
Gout
Septic Arthritis
Investigations (4)
Urgent joint aspiration for synovial fluid microscopy and culture
X-ray (but may be normal)
CRP (but may be normal)
Blood cultures (guidance for antibiotics)
Septic Arthritis
Treatment (3)
Antibiotics: flucloxacillin/clindamycin , vancomycin if MRSA, cefotaxime if gonococcal or gram -ve
Antibiotics for 2 weeks IV, 2-4 weeks orally
Orthopaedics: arthocentesis, lavage and debridement
Ankylosing Spondylitis
Definition (3)
Seronegative arthritis
Chronic inflammatory disease of the spine and sacroiliac joints
Typical patient is a man <30
Ankylosing Spondylitis
Signs + symptoms (6)
Gradual onset of low back pain, worse at night, with spinal morning stiffness relieved by exercise
Pain radiates from sacroiliac joints to hips/buttocks and usually improves towards the end of the day
Associated with osteoporosis
Progressive loss of spinal movement, hence reduced thoracic expansion
Acute iritis in 1/3 and may lead to blindness
Enthesitis (inflammation of site of tendon/ligament insertion into bone): achilles tendonitis, plantar fasciitis
Ankylosing Spondylitis
Examination (3)
Schober’s test
Lateral neck flexion
Kyphosis
Ankylosing Spondylitis
Investigations (7)
MRI
X-ray: sacroiliitis earliest feature, erosions, sclerosis
Vertebral syndesmophytes (often T11-L1 initially): bony proliferations due to enthesitis between ligaments and vertebrae
FBC (normocytic anaemia)
High ESR
High CRP
HLA B27 +ve
Ankylosing Spondylitis
Treatment (6)
Physiotherapy to maintain posture and mobility
NSAIDs (ibuprofen/naproxen) to relieve symptoms
TNF-a blockers: adalimumab, etanercept ,infliximab
Local steroid injections for temporary relief
Surgery eg. hip replacement/spinal osteotomy
Consider bisphosphonates for increased risk of spinal fractures
Gout
Signs + symptoms (3)
Typically acute monoarthropathy with severe joint inflammation
>50% occur at MTP of big toe
Other common joints: ankle, foot, small joints of hand, wrist, elbow or knee
Gout
Pathology (4)
Caused by deposition of monosodium urate crystals in and near joints
Often precipitated by trauma, surgery, starvation, infection or diuretics
High plasma urate
In the long term, urate deposits (tophi eg. in pinna, tendons, joints) and renal disease (stones, interstitial nephritis) may occur
Gout Differential diagnoses (4)
Septic arthritis
Haemarthrosis
Pseudogout
Palindromic RA
Gout
Aetiology (6)
Hereditary High dietary purines Alcohol excess Diuretics Leukaemia Also associated with cardiovascular disease, hypertension,diabetes and chronic renal failure
Gout
Investigations (3)
Polarised light microscopy of synovial fluid: negatively bifringent urate crystals (needle-shaped)
Increased serum urate
Radiographs only show soft-tissue swelling in the early stages, later ‘punched out’ erosions in juxta-articular bone
Gout
Treatment of acute attack (3)
High-dose NSAIDs (symptoms should subside in 3-5 days)
Steroids may be used
Rest, ice and elevation
Gout
Treatment as prophylaxis (4)
Start if >1 attack in 12 months, tophi or renal stones
Aim is to reduce attacks and prevent damage caused by crystal deposition
Allopurinol (titrate up until plasma urate <0.3mmol/l)
Use of allopurinol may trigger an attack so wait until 3 weeks after an acute episode
Pseudogout
Signs + symptoms (2)
Acute monoarthropathy typically of larger joints in elderly patients
Usually spontaneous and self-limiting but can be provoked by illness, surgery or trauma
Pseudogout Risk factors (3)
Old age
Hyperparathyroidism
Haemochromatosis
Pseudogout Investigations (2)
Polarised light microscopy of synovial fluid shows weakly positive bifringent crystals (rhomboid shaped calcium pyrophosphate dihydrate crystals)
X-ray (soft tissue calcium deposits)
Pseudogout Treatment (2)
Treatment of acute attack: cool packs, rest, aspiration and intra-articular steroids
Treatment as prophylaxis: NSAIDs may prevent acute attacks
Enteric Arthropathy
Associations (3)
Inflammatory bowel disease
GI bypass
Coeliac and Whipples disease
Enteric Arthropathy
Treatment (2)
Arthropathy often improves with the treatment of bowel symptoms
DMARDs for resistant cases
Psoriatic Arthritis
Epidemiology (1)
Occurs in 10-40% with psoriasis and can present before skin changes
Psoriatic Arthritis
Signs + symptoms (5)
Symmetrical polyarthritis DIP joints Asymmetrical oligoarthritis Spinal (similar to ank spond) Thickened nails with pits/ridges
Psoriatic Arthritis
Investigations (1)
X-ray: erosive changes with deformity
Psoriatic Arthritis
Treatment (5)
NSAIDs DMARDs: methotrexate, sulfasalazine Biologics if failure or intolerance of at least 2 DMARDs Adalimumab 1st Then 2nd anti-TNF etnarcept/infliximab
Reactive Arthritis
Pathology (4)
Sterile arthritis
Typically affects lower limb
1-4 weeks after urethritis (chlamydia) or dysentery (campylobacter, salmonella)
May be chronic or relapsing