MUSCULOSKELETAL & RHEUMATOLOGY Flashcards
what is Systemic Lupus Erythematosus (SLE)?
chronic autoimmune disease that can affect any part of the body, including the skin, joints, kidneys, brain, and other organs
what is the clinical criteria of SLE?
- malar (butterfly)rash, discoid rash, photosensitivity rash
- oral ulcers, alopecia
- arthritis (symmetrical)
- kidney disorder (proteinuria/cellular casts/high BP),
- neurological disorder (seizures or psychosis),
- hematologic disorder (hemolytic anemia (Coombs positive), lymphopenia, or thrombocytopenia)
- other organ involvement
what are tests done for SLE?
- Anti-dsDNA and Anti-Smith (Anti-Sm) Antibodies - specific
- Antinuclear Antibody (ANA) Test - positive, less specific
- complement factors, C3, C4 - low is LSE
- FBC, CRP, ESR - indicate inflammation and anaemia
- urinanalyis - kindey involvement
- imaging eg xray for other organ involvement
what is the treatment/management of SLE?
- (NSAIDs): For joint pain and stiffness.
- Antimalarial Drugs (Hydroxychloroquine): skin and joint symptoms.
- Corticosteroids and Immunosuppressive Agents: For more severe disease manifestations
- cytotoxic drugs
- Biologics: belimumab
- Lifestyle Modifications: sun protection, exercise, healthy diet.
- stem cell transplant
- Identify patients with phospholipid antibodies
- assess atherosclerosis/major organs
what is Raynaud’s phenomenon?
blood stops flowing properly to your fingers and toes
what causes primary vs secondary Raynaud’s phenomenon?
primary - unknown, absence of another underlying disease
secondary - autoimmune diseases (e.g. SLE, scleroderma, rheumatoid arthritis), injuries, drugs, vascular damage
what kind of vascular damage can cause Raynaud’s phenomenon?
Atherosclerosis
Frost bite
Vibrating tools
what are the 2 subtypes of systemic slerosis/scleroderma?
- Limited cutaneous systemic sclerosis (lcSSc) (AKA CREST)
- Diffuse cutaneous systemic sclerosis (dcSSc)
what are the main features of systemic sclerosis?
Vasculopathy
Excessive collagen deposition
Inflammation
Auto-antibody production
what is the diffrence between limited and diffuse systemic sclerosis?
limited:
- Long history of Raynaud’s phenomenon
- skin thickening at hands, arms, and face
- slow progressing
Diffuse:
- Short History of Raynaud’s phenomenon
- thickening extends to trunk and proximal limbs
- increased risk of organ involvement - renal, lung, cardiac
what investigations/tests are required for systemic sclerosis?
- blood tests - anti-Scl-70 & ANA = diffuse, anti-centromere = limited
- Pulmonary function tests (PFTs) - asses lung involvement
- Echocardiogram: To assess for pulmonary hypertension and cardiac involvement.
- ct scan - organ involvement
- skin biopsy - extent of fibrosis
what is the treatment/management for systemic sclerosis?
- Mycophenolate - immunosupressant
- PPI - reflux
- ACE inhibitors - prevent renal crisis
- Fluoxetine, vasodilators - raynauds
- Cyclophosphamide(im-sup), PDE5 - pulmonary fibrosis
- Annual echocardiograms and pulmonary function tests
- Early detection of pulmonary arterial hypertension
- Autologous stem cell transplant - severe cases
what is Sjögren’s Syndrome?
- autoimmune disorder
- attacks moisture-producing glands, primarily the salivary and lacrimal glands
- dry mouth and eyes
what is the classification of sjogrens syndrome?
- primary - absence of underlying autoimmune disease
- secondary - in conjunction with another autoimmune disease eg SLE, RA, Scleroderma, Primary billiary cirrhosis
what are symptoms of sjogrens syndrome?
dry eyes
dry mouth
dental problems - swollen parotid gland
fatigue and pain
Skin, nose, and vaginal dryness
systemic involvement - increased risk of gluten sensitivity, lymphoma, Renal tubular acidosis
what are investigtaions/tests for sjogrens syndrome?
- blood test - antibodies positive eg ANA, Ro/La, rheumatoid factor, raised immunoglobins
- ultrasound - abnormal salivary glands
- biopsy - Sialadenitis on lip (goldst)
- Schirmer’s test - Measures tear production to evaluate dry eyes.
what is the treatment for sjogrens syndrome
- dry eyes - cyclosporine eye drops, punctal plugs to retain moisture, artificial tears
- dry mouth - Saliva substitutes, pilocarpine/cevimeline to stimulate saliva production.
- Hydroxychloroquine - for fatigue, myalgia, rash
- Corticosteroids/immunosuppressants
what are examples of autoimmune Connective tissue disease?
- Systemic lupus erythematosus
- Systemic sclerosis
- Primary Sjögren’s Syndrome
- Dermatomyositis/Polymyositis
what is Dermatomyositis/Polymyositis?
- both cause muscle weakness (close to trunk)
- dermatomyositis also presents with rash
- can affect lungs
what are characteristic of Dermatomyositis rash?
- violet or dusky red rash
- face, eyelids, chest, knees, elbows, and knuckles
- often with swelling
- Gottron’s papules - scaly rash over knuckles
- Heliotrope rash - rash over eyelids
what investigations/tests are done for Dermatomyositis/Polymyositis?
- Muscle enzymes (Creatine Kinase) - raised
- Electromyography (EMG) - Measures electrical activity in muscles
- Muscle biopsy - shows inflammation/fiber necrosis
- Screen for malignancy (PET-CT) - Malignancy associated antibodies
- Chest X ray, PFTs, High resolution CT - for lung involvement
what is the treatment for Dermatomyositis/Polymyositis?
- steroids (inflammation) - Prednisone
- immunosupressive drugs - eg rituximab, methotrexate
- Hydroxychloroquine - for rash
what are some Myositis‐specific autoantibodies?
MDA5,
NXP2,
TIF1-gamma
ARS
what are some inherited connective tissue disorders?
- Marfan’s
- Ehlers Danlos
what are some features of marfans syndrome?
- Tall and slender body, hypermobility
- Lens dislocation & myopia
- dilation of aorta
- High arched palate.
- Pectus excavatum - depressed chest
how is marfans syndrome diagnosed?
- clinical features
- FBN1 gene mutation
what are features of Ehlers-Danlos Syndrome (EDS)?
- hyperelastic skin, brusies easily
- joint hypermobility & disolcation
- vascular rigidity
- mitral valve prolapse
what are features of inflammatory arthritis?
- swelling - red/warm, Synovial (compressible, tender)
- worse in morning/inactivity
- stiffness over 30 mins
- constant/intermitant
what are causes of joint inflammation?
- autoimmune Arthritis: RA,
- degenerative artheritis
- Crystal arthrits – gout and pseudogout
- septic arthiritis
what are risk factors of Rheumatoid Arthritis?
family history
smoking
more common in females
what are complications of RA if untreated?
- joint damage
- CVD - HA, sroke
- intestitial lung disease
- eye problems - scleritis or uveitis
what does Rheumatoid Arthritis affect?
- Symmetrical small joints, hands wrists feet
- big joints involved later ( bad prognosis if on presentation)
what is Seronegative Arthritis?
-ve for CCP and RF
- affects Asymmetrical big joints, with spinal involvement
- more common in men
- Associated symptoms - IBD, psoriasis, eye inflammation
what are 5 different forms of Psoriatic Arthritis?
DIP Arthritis that affects the small joints, ends of fingers, toes, or both
Asymmetrical arthritis of the joints in the hands and feet
Symmetrical polyarthritis, which is similar to RA
Arthritis mutilans, a rare type of arthritis that destroys and deforms joints
Psoriatic spondylitis, arthritis of the lower back (sacroiliac sac) and the spine
what are the risk factors of gout?
beer, fructose
renal impairment,
diuretics,
aspirin
family history
- more common in men pseudo gout more in women)
how does pseudo gout present on xray?
Chondrocalcinosis
what are features of osteoarthritis?
- slow onset - later in life
- initially asymmetric
- affects weight bearing joints - knees, hips, thumb, big toe
- stiffness worse end of day (not morning like other arthiritis)
what is important to consider when diagnosing a types of arthiritis?
- inflammation - swelling/flares/CRP
- pattern - symmetrical/asymmetrical
- associated symptoms eg eye, nail psoriasis, bowels
- tests - RF/CCP, uric acid, x-ray
what is the pathogenesis of gout?
- overproduction of urate from diet and alcohol
- under exretion of urate due to genetics/drugs
- causes hyperuricaemia - crystals form
- inflammatory response when getting rid of crystals
what items in a diet contribute to gout?
beer/larger - contain guanosine
red meat, shellfish
sweetened soft drinks with fructose
what tests/investigations are required for gout?
- monosodium urate (MSU) crystals in the joint fluid or tophus
- FBC - raised WWC
- LFT if alcohol concern
- CRP
- xray - if sepsis differential diagnosis or chronic
- Serum Uric Acid - normal in acute attack
what is the treatment of acute gout?
- lifestyle changes - diet, alcohol, weight, fluid
- NSAID - short course - pain relief/inflammation
- Colchicine - anti-inflammatory (SE diarrhoea)
- corticosteroids - Prednisolone
what medication lowers uric acid levels and when is it used?
- Allopurinol – Xanthine Oxidase Inhibitor
- Febuxostat
- long-term gout
what is uric acid target when managing chronic gout?
below 360 umol/l
what are complications of gout?
- tophi
- renal disease - calculi, acute/chronic urate nephropathy
what is the pathophysiology of rheumatoid artheritis?
- T cell attack synovium
- leads to synovial hyperplasia
- invades and damages cartilage and bone
- pro-inflammatory cytokines, tumor necrosis factor (TNF) perpetuates inflammation
what are symptoms and signs of rheumatoid artheritis?
- symmetrical Pain and Swelling of joints - hands/wrists/feet
- early morning stiffness
- Decreased grip strength
- fatigue, malaise
what are the tests/investigations for Rheumatoid Arthritis?
- CRP
- Rheumatoid factor - (70% are +ve, false +ve)
-Anti-CCP (cyclic citrullinated peptide) - xray/mri assesses joint damage
- FBC - anemia is common
what is seen on an xray in RA?
Soft tissue swelling
Periarticular osteopenia
Joint space narrowing
Bone erosion
what is the treatment of RA?
- DMARD (Disease-Modifying Anti-Rheumatic Drugs)
- Methotrexate (1st line)
- biological DMARD - Anti-TNF Medications, TNF-inhibiors, Rituximab, JAK inhibitors etc.
- NSAIDS/corticosteroids - pain/inflammation
- splints/rest/ice
- Colchicine – helpful for crystal arthritis
what bacteria causes Prosthetic Joint Infection?
most common - Staphylococcus aureus (including MRSA)
Coagulase-negative staphylococci
Streptococci
Enterococci
(gram -ve - bacilli eg e.coli)
what are routes of infection to the bone?
- direct inoculation - eg from trauma/surgery
- contiguous spread - from adjacent tissue or DM, ulcers, vascular disease
- Haematogenous seeding - more common in children
what blood tests can suggest osteomyelitis/inflammation?
high ESR
high WCC/neutrophils
high CRP
Procalcitonin - elevated in bacterial infection, rather than other inflammation