rheumatology conditions Flashcards
osteoarthritis
- non-inflammatory condition
- occurs in synovial joints
imbalance between cartilage wearing down + chondrocytes repairing it
osteoarthritis appearance on x-ray
L - loss of joint space
O - osteophytes (bone spurs)
S- subarticular sclerosis (increased density of bone along joint line)
S - subchondral cysts (fluid filled holes in bone)
presentation of osteoarthritis
- joint pain + stiffness that’s worse with activity + @ end of day
- bulky, bony enlargement of joint - Hebredens + bouchards nodes
- restricted range of movements / crepitus
- fluid around joints
what is the difference between heberdens nodes and bouchards nodes?
heberdens nodes = joints of distal finger (DIPs)
bouchards nodes = proximal finger (PIPs)
what is the main clinical difference between rheumatoid arthritis and osteoarthritis?
osteoarthritis - worse at with activity + at end of day, non-inflammatory
rheumatoid - improves with activity + worst after rest, inflammatory
is rheumatoid arthritis more common in men or women?
3 x more commo in women - usually presents middle aged + with family history
genes associated with rheumatoid arthritis
HLA DR1 - occasionally present in rheumatoid arthritis patients
HLA DR4 - often present in rheumatoid FACTOR positive patients
rheumatoid arthritis
autoimmune
inflammatory
chronic inflammation of synovial lining (synovitis) of joints, tendon sheaths + bursa - inflammation increases risk of tendon rupture
usually symmetrical + affects multiple joints = symmetrical polyarthritis
pathophysio of rheumatoid arthritis
rheumatoid factor = autoantibody in 70% of RA patients
–> it targets the Fc portion of the IgG antibody causing activation of immune system against patients own IgG causing systemic inflammation
RF is most commonly IgM but can be any
anti-CCP antibodies are distributed through circulation + form immune complexes with CCP produced in the inflamed synovium
signs of rheumatoid arthritis in hands
- Z shaped thumb
- swan neck = hyperextended PIP + flexed DIP
- boutonnieres = hyperextended DIP + flexed PIP
- ulnar deviation of fingers at the knuckle
extra-articular manifestations of rheumatoid arthritis
- pulmonary fibrosis - caplan’s syndrome
- broncholitis obliterans
- Felty’s syndrome
- lymphadenopathy
- carpel tunnel syndrome
diagnosis of rheumatoid arthritis
clinical if - symmetrical polyarthropathy affecting small joints
check rheumatoid factor + anti-CCP
inflammatory markers - CRP + ESR
management of rheumatoid arthritis
MDT - occupational, physio, podiatry
steroids for flares
NSAIDs/COX-2 inhibitors - prescribe with PPI
1st line = monotherapy of either: methotrexate, leflunomide, sulfasalazine
2nd = 2 of above in combo
3rd = methotrexate + biological therapy (usually TNF inhibitor)
4th = methotrexate + rituximab
hydroxychloroquine = mildest rheumatic drug
does pregnancy improve or worsen symptoms of rheumatoid arthritis?
improves
medication of choice during pregnancy = sulfasalazine / hydroxychloroquine
management of septic arthritis
- empirical IV antibiotics until sensitivities known
- antibiotics for 3-6weeks
1st line = flucloxacillin + rifampicin
penicillin allergy, MRSA or prosthetic joint = vancomycin + rifampicin
alternative = clindamycin
septic arthritis investigations
aspirate joint prior to antibiotics, send for -
- gram staining
- crystal microscopy
- culture
- antibiotic sensitivities
most common causative organism of septic arthritis
staph aureus !
neisseria gonorrhoea (gram neg diplococcus) - sexually active
Group A Strep - strep pyogenes
haemophilus influenza
e. coli
diagnosis of osteoarthritis
no need for investigations if over 45 and has typical symptoms + NO morning stiffness or lasts under 30 mins
what can trigger rheumatoid arthritis?
infections + smoking
scoring used for rheumatoid arthritis
DAS28 score
- disease activity score - useful for monitoring + response to treatment
when are biologics used in the treatment of rheumatoid arthritis?
when 2 DMARDs tried or DAS28 >5.1
side effects of DMARDs
- increased risk of infection
- liver function derrangement
- pneumonitis !
- nausea
methotrexate
- teratogenic - must be stopped at least 3 months prior to conception
- needs regular blood monitoring
anti-TNF side effects
- increased risk of infection
- increased risk of skin cancer
- exacerbation of heart failure
- reactivation of latent TB
what gene is common in seronegative spondylarthritis’s?
HLA B27
common presentations amongst spondyloarthropathies
- enthesitis = inflammation at insertion of tendons into bones
- dactylitis = sausage digits
- anterior uveitis, conjunctivitis
- mucocutaneous lesions
- aortic incompetence or heart block
key joints affected in ankylosing spondylitis
sacroiliac joints + vertebral column
inflammation causes joint pain + stiffness - can progress to fusion of joints (“bamboo spine”)
classic presentation of ankylosing spondylitis
- young male in late teens / 20s
- symptoms develop gradually over 3 months + can flare
- lower back pain + stiffness + sacroiliac pain in buttock region
- – worse with rest + improves with movement
- – worse at night + in morning - may wake from sleep
associations = weight loss, chest pain, enthesitis, dactylitis, pulmonary fibrosis
what is Schobrt’s test and what is it used to diagnose?
used to assess mobility spine
find L5 vertebra - mark point 10cm above + 5cm below
ask patient to bend forward as far as they can + measure distance between 2 points
ankylosing spondylitis - distance <20cm
investigations in ankylosing spondylitis
- Schober’s test
- CRP + ESR - raised
- x-ray of spine + sacrum
- MRI of spine can show bone marrow oedema in early disease pre x-ray changes
ankylosing spondylitis x-ray appearance
bamboo spine
squaring of vertebral bodies
sunchondral sclerosis + erosion
syndesmophytes = areas of bone growth where lligaments insert into bone
ossification of ligaments, discs + joints (they turn into bone)
fusion of facet, sacroiliac + costovertebral joints
treatment of ankylosing spondylitis
- NSAIDs for pain
- steroids during flares
- anti-TNF - etsnercept, infliximab
- secukinumab if above inadequate
- physio, avoid smoking
- bisphosphonates to treat osteoporosis
- surgery sometimes required for deformities to spine / other joints
psoriatic arthritis appearance on x-ray
- periostitis = inflammation of periosteum causing thickened + irregular outline of bone
- ankylosis = bones joining together causing stiffening
- osteolysis
pencil-in-cup appearance - central erosions of bone beside joint
severe form of psoriatic arthritis
arthritis mutilans
- occurs in phalanxes
- osteolysis around joints + digits
-> leads to progressive shortening of digit, skin then folds as the digit shortens giving “telescopic finger”
reactive arthritis
where synovitis occurs in the joints as a reaction to a recent trigger
-> usually 1-4 weeks post infection (nothing can be cultured from synovial fluid)
triggers of reactive arthritis
gastroenteritis (enterogenic) - salmonella, shigella, yersinia
sexually transmitted infection - chlamydia
reactive arthritis presentation
“can’t see, pee or climb a tree”
- bilateral conjunctivitis / anterior uveitis
- circinate balantis = dermatitis of head of penis
- warm, swollen, painful joint - acute monoarthritis affecting single joint of lower limb (knee = commonest)
reactive arthritis management
- NSAIDs
- steroid injections into affected joints (systemic steroids if multiple joints)
- may resolve within 6 months + no recur
- -> recurrent = DMARDs / anti-TNF
septic arthritis presentation
rapid onset of -
- hot, red, swollen, painful
- stiffness + reduced range of movement
- systemic symptoms - fever, lethargy + sepsis
common causative organisms in septic arthritis
most common = staph aureus
- neisseria gonorrhoea (gonococcus, gram neg diplococcus)
- -> in sexually active, exclude in young patients
- Group A Strep - strep pyogenes
- haemophilus influenza
- e. coli
enteropathic arthritis
associated with IBD - symptoms worse during flares
–> watery stool with mucus + blood
risk factors for gout
- high purine diet (meat, seafood), diuretics
- obesity, alcohol, psoriasis
- renalfailure, hypothyroidism
- fam history
rare under 20s, decreases after age 80
more common in men, very rare in premenopausal women
causes of gout
hyperuricaemia
–> hyperuricaemia results in crystallisation encouraged by lower temp (synovial fluid = 32 degrees)
- increased urate production
- reduced urate excretion
typical joints affected in gout
base of big toe (metarsophalangeal)
wrists
base of thumb (carpometacarpal)
gout presentation
- affecting big toe, wrists, base of thumb
- rapid onset severe pain
- tophi - subcutaneous deposits of uric acid
- erythema + warmth
gout investigations
- serum uric acid raised
- polarised microscopy of synovial fluid
- – strongly negative birefringent needle-shaped crystals
- – monosodium urate crystals
- x-ray = punched out erosions with sclerotic borders
treatment of acute attack of gout
ACUTE
- NSAIDs - not in CKD
- colchicine
- steroids
PREVENTATIVE treatment
-> start 2 weeks after acute attack until urate is <360
preventative treatment of gout
start 2 weeks after acute attack until urate <360
- allopurinol (xanthine oxidase inhibitors)
- ->DON’t give in acute, rash in elderly + renal impaired, interacts with azathioprine
- uricosuric drugs - probenecid, sulphinpyrazone
- interleukin-1 inhibitors
lose weight, drink less, eat less meat/seafood
investigations for pseudogout
aspirate synovial fluid
- no bacterial growth
- calcium pyrophosphate crystals
- rhomboid shaped crystals
- positive birefringent of polarised light
treatment of pseudogout
- NSAIDs
- colchicine
- steroids
- rehydration
what minority does SLE commonly affect?
more common in women + asians/afro-caribbean
usually young - middle aged