Rheumatology Flashcards
Using the mnemonic CHIMP, name the drugs that can cause Drug Induced Lupus
- Carbamazepine/Chlorpromazine
- Hydralazine
- Isoniazid/Infliximab
- Minocycline
- Penicillamine/Procainamide/Pyrazinamide
Name the two ‘special tests’ for Carpal Tunnel Syndrome
Tinnel’s test Phalen’s test
Give two rheumatological causes of Neutropenia
- SLE
- DMARD Toxicity (neutropenic sepsis)
Name three inflammatory markers and what they indicate
ESR - Erythrocyte Sedimentation Rate (reflects presence of fibrinogen and immunoglobulins) PV - Plasma Viscocity (same as above) CRP - Short lived protein good for monitoring progression
Give 4 subtypes of ANA and what they’re raised in
- Anti DsDNA - SLE
- Anti RO - Sjogren’s
- Anti Centromere - Systemic Sclerosis
- Anti Jo-1 - Polymyositis
what anti body is associated with Sjogren’s?
anti-RO and anti-LA
what antibodies are associated with SLE?
anti-dsDNA
anti RO and anti LA
which antibodies are associated with Systemic sclerosis?
anti cantromere and anti Scl70
which antibody raises with disease activity?
anti-dsDNA
what antibody is associated with Polymyositis?
anti Jo-1
What is ANCA?
Anti Neutrophil Cytoplasmic Antibody
- antibodies directed against enzymes present in neutrophils
what condition are patients ANCA positive?
GPA - Granulomatosis with Polyangiitis
(aka Wegener’s granulomatosis)
What is HLA - B27 and what conditions is it associated with?
class 1 surface antigen associated with:
- Ankylosing Spondylitis
- Iritis
- Juvenile Arthritis
What 2 conditions is urinalysis mandated in?
SLE
vasculitis
what 2 conditions must synovial fluid analysis be done and what may be seen on polarized light microscopy?
- septic arthritis - gram stain and culture before Abx
- crystal arthropathy
- negatively birefringent needle shaped crystals in gout
- positively birefringent rhomboid shaped crystals in pseudo gout
What is Polymyositis?
Inflammation of striated muscle
How does Polymyositis present?
Insiduous Onset (Painless)
May be myalgia (muscle pain)
Proximal Muscle Weakness
Raynauds
Dysphagia/Dysphonia/Resp Weakness
How does Dermatomyositis present?
Muscle and Skin signs, Skin Signs being
- Helitrope Rash (lilac rash around eyes)
- Shawl Sign (macular rash)
- Nail Fold Infarcts
Describe the 5 Diagnostic Criteria of (Dermato)Myositis, and how many is required for each
- Symmetrical Proximal Muscle Weakness
- Raised serum muscle enzyme levels (CK,ALT,AST)
- Electromyograph showing fibrillatory changes
- Biopsy evidence
- PM requires 3
- DM requires 2 + Skin Changes
Name 4 investigations you could do for Polymyositis and what they would show
Bloods - Raised ALT (normal LFTs)
Bloods - Raised ANA - Anti Jo1
Electromyograph - Fibrillatory Changes
Muscle MRI - Muscle Oedema
How is Polymyositis managed?
Initial - High dose Prednisolone Followed by DMARDs if resistant
How is Dermatomyositis managed long term?
Hydroxychloroquine and sun protection
What is Fibromyalgia?
Disorder of central pain processing characteised by widespread pain in all 4 quadrants of the body, associated with Allodynia (painful response to non painful stimulus), and Hyperaesthesia (exaggerated response to mildly painful stimulus)
Describe three different aetiological ideas for Fibromyalgia
Sleep Deprivation - Hyperactivation in response to painful stimuli Patient CSF - Increased Substance P and decreased NA and Serotonin PET Scan - Abnormal central dopamine response to pain
Give presentations of Fibromyalgia
- Widespread Pain
- Profound fatigue
- Unrefreshed Sleep
- Migraines
- Numbness
- Depression
- Joint/Muscle Stiffness
- IBS/iritable bladder syndrome
- poor concentration and memory (fibrofog)
what is seen on examination of fibromyalgia?
- no physical abnormalities to the MSK
- no neurological symptoms
- tender points on palpation of their muscles
Fibromyalgia is purely a clinical diagnosis, how could you manage it?
- Physio
- CBT
- Low dose Amitryptyline/Pregabalin
what is significant about a diagnosis of fibromyalgia?
it is a diagnosis of exclusion
What is Giant Cell Arteritis? aka temporal arteritis
Chronic vasculitis in large and medium sized vessels occurring in over 50s
most commonly causes inflammation of the arteries originating from the arch of the aorta
Why do you get Jaw Claudication in GCA?
Inflammation of arteries supplying the muscles of mastication results in jaw clauducation and tongue discomfort following chewing and talking at length
Give 5 presentations of GCA
- Headache (unilateral over temple)
- Scalp Tenderness - over temporal artery
- Jaw Claudication (+tongue)
- Amaurosis Fugax, blindness, diplopia, blurring
- Malaise + constitutional symptoms
Name three investigations you could do for GCA. What would they show?
- Bloods - Raised ESR and CRP
- Temporal Artery Biopsy - Necrotising arteritis (skip lesions)
- Doppler - Decreased pulsation of temporal artery
Name three risk factors for GCA
- Age (>60)
- Female
- White
- strong association with PMR
How is GCA diagnosed?
diagnosed if 2 or more of the following:
- raised ESR, CRP, PV
- new onset localised headache
- tenderness/decreased pulsation of temporal artery
- new onset visual symptoms
- biopsy revealing necrotising arteritis
How would you manage GCA?
- Prednisolone 60-100mg for 2 weeks before tapering
- If visual symptoms consider 1g methylprednisolone IV pulse therapy for 1-3 days
- Low-dose aspirin to reduce thrombotic risks
What is Gout? And which joint is most commonly affected?
Accumulation of Monosodium Urate crystals in joints and soft tissues causes an inflammatory arthritis
1st MTP (metatarsophalangeal) joint
Give two long term manifestations of Gout
Urate Nephropathy
Uric Acid Nephrolithiasis
how does gout present?
sudden, severe attacks of pain, swelling, redness and tenderness in the joints, often the joint at the base of the big toe
Give 2 modifiable and some non modifiable risk factors of Gout
Non Mod = >40 yo & Male
Mod
- Increased Alcohol
- Thiazide Diuretics
- high purine intake
- hypertension
- DM
- obesity
- smoking
- dyslipidaemia
- CAD
- renal disease
- organ transplant
how can gout be prevented?
- maintain optimal weight
- regular exercise
- diet modification
- smoking cessation
- decrease alcohol
- increase fluid intake
What would a synovial fluid sample show of Gout? What would you see for pseudogout?
Yellow and Turbid Polarised Light Microscopy - Negatively bifringent needles
pseudogout = Positively berefringent romboid shaped crystals made of calcium pyrophosphate
What would an Xray of Gout show?
Early stage = swelling
Late = normal joint space, soft tissue swelling and periarticular erosions
how is gout diagnosed?
2 of the following
- typical Hx
- tophi
- increased serum urate
- crystals in joint
Give 3 pharmacological options to TREAT Gout - acute
- NSAIDs (Diclofenac, Naproxen)
- Steroids
- Colchicine (good when NSAIDs CI) its an antimitotic drug and decreases inflammation caused by uric acid crystals
Give 2 pharmacological options to PREVENT Gout. What should you tell the patient?
- Allopurinol and Febuxostat (XANTHINE OXIDASE INHIBITORS)
- Do not start the drugs in an acute attack
- Cover with NSAIDs once started as they may precipitate an attack
Give 4 contraindications to the use of NSAIDs
BARS
- B- Bleeding
- A - Asthma
- R - Renal Dysfunction
- S - Stomach (Peptic Ulcer or Gastritis)
What is the pathophysiology of Pseudogout?
- Calcium Pyrophosphate crystals
- Positive bifringent rods
What is Hypermobility Spectrum Disorder?
Pain syndrome in people with joints that move beyond normal limits
Give 5 presentations of Hypermobility Spectrum Disorder
Pain around joints (worse after activity)
Hernias
Drooping Eyelids
Recurrent dislocations
Marfans/EDS
What gene is defective in Marfans?
Fibrillin
Describe 3 aetiologies of OA
- Failure of normal cartilage due to prolonged abnormal or excessive loading
- Damaged cartilage failing under normal conditions
- Cartilage breaks up due to defective bone putting on more weight
Describe the cartilage of OA on a microscopic level
- Decreased elasticity
- Decreased cellularity
- Decreased tensile strength
The pain of OA cannot originate from the cartilage itself as it is avascular and aneural, therefore where does it originate from?
- Microfractures of bone
- Low grade synovitis
- Capsular distension
- Muscle spasm
Give 4 presentations of OA
- Pain and Crepitus on movement
- Joint Gelling
- Background Ache at rest
- Joint Swelling
Describe the XRay findings of OA
Loss of joint space
Osteophytes
Subchondral Sclerosis
Subchondral Cysts