Rheumatology Medicine 🩼✅ Flashcards
AI polyendocrinopathy syndrome 1?? What is this
AIRE mutation. Chronic mucocandidiasis, hypoparathyroidism, Addison’s,
AI polyendocrinopathy syndrome 2… what is it???
HLA DR3/4 associated. Addisons and thyroid AI. And more like pernicious anemia
How to diagnose and manage a Polyendocrinopathy case
Invx with the specific antibody (anti TPO, parietal cell, IF). Manage the specific disease (antifunal, B12) and immunosuppressant
Why could primary adrenal insufficiency patients get hyponatremia
They get high ADH…
addisons is associated with what acid base abnormality
Non AG met acidosis
Initial test for addisons
Morning cortisol
If suspect addisons, and done the morning cortisol test… comes back less than 3… what next
Do morning ACTH (this doesn’t confirm diagnosis)
How to confirm Addison’s disease diagnosis
Synacten test (give ACTH, and see a failure of cortisol to rise). Should measure cortisol before, 30 mins and 60 mins after
A cortisol level of what post synacten is indicative of addisons
Less than 18-20
What is the insulin tolerance test for Addison’s? CI for test?
Give insulin (usually lowers glucose which will increase ACTH and cortisol. Cortisol doesn’t increase in Addisons. CI’d in elderly and seizure patients
What is the overnight metyrapone test for addisons
Give metyrapone (usually inhibits cortisol prod, increasing ACTH, and increasing 11(OH)cortisol. In addisons 11(OH)cortisol doesn’t increase
What imaging is considered in primary adrenal insufficiency
CT/MRI abdomen
Antibody to screen for in addisons (only positive some of the time)
Anti 21(OH) ase
Treatment for addisons (consider three elements)
(Hydrocortisone or prednisolone =highest dose in morning) and (fludrocortisone =mineralcorticoid) and (DHEA =in females only who have depression/low libido)
What is stress dose steroids in addisons
Steroid dose increased in Sx, illness to reduce risk of adrenal crisis
Discuss the invx and dx of adrenal crisis
Based at first on clinical suspicion (and basic labs). Can take random cortisol level (do before admin cortisone). Synacten only once patient stabilised
How to
Manage a patient with addisons crisis (consider 4 elements)
Hydrocortisone (prednisolone 2nd line). Fludrocortisone (got flu = sepsis) only if septic shock, or if patient receiving a non-hydrocortisone GC. 1L of isotonic saline in first hour. IV dextrose.
When do we give fludrocortisone in addinsonian crisis?
Fludrocortisone only if septic shock, or if patient receiving a non-hydrocortisone GC.
HLA for RA
HLA DR4 and DR1
What is the clinical diagnosis criteria (not that strict) for RA
Arthralgia and joint stiffness for 6 or more weeks in 3 or more joints
Initial imaging for for RA
X ray (if both hands and feet). Good to get baseline too!
Why do TFTs in RA patients?
AI thyroiditis is common in RA patients
Most specific AB marker for RA?
Anti CCP
HLA in RA?
HLA DR4 and DR1 (4 propellers 1 camera)
Late vs early findings of RA on X-RAY
Early: soft tissue swelling and osteopenia subchondrallu.
Late: joint space narrows, subchondral cysts, more generalised osteopenia
Use of US in RA Invx
Can detect early changes, likely signs of inflam (synovial hyperemia)
Use of MRI in RA?
Can detect early changes (inflam), and good to check for atlantiaxial subluxation
Acute RA flare Tx
Lowest dose possible GCs (prednisone) for less than 3 months. NSAIDs can also be used instead
Long term therapy for RA (basic idea)
DMARDS are first line (like MTX), but need to bridge with NSAID, since they take time to work
When is hydroxychloroquine given in RA
Can be used as a chronic treatment, for low disease activity patients (not a 1st line)
First line DMARD for RA
methotrexate! In all patients (except preg of course)
When is sulfalazine given in RA
In low activity RA, when MTX is contraindicated
When is leflunomide given in RA?
When all other DMARDS not able to be used
If patient with with RA has persistent moderate to severe symptoms, despite 3 months of DMARDs… give what?
Biologicals
How to investigate RA of the cervices spine?
Extension and flexion X-rays of the cervical spine. Or MRI
Before a RA patient undergoes general anaesthesia… need to check what?
Check for atlantoaxial subluxation (with X-RAY)
When do you do surgery in Atlanto axial subluxation
If there is instability or myelopathy
Felty is associated with which cancer?
NHL
Which markers are elevated in RA arthritis patients
RF, Anti CCP (since it comes from RA)
First line and second line Tx for Felty syndrome
Methotrexate (cyclophosphamide 2nd)
If patient with Felty has severe granulocytopenia, can give what?
GCSF
Most common septic arthritis bacteria in < 2 year olds
Kingella Kingae
Most common septic arthritis bacteria in > 2 year olds
Staphylococcus aureus
If patient has prosthetic joint infx (septic arthritis) within 3 months of placement… what is the likely organism
Staphylococcus aureus
If patient has prosthetic joint infx (septic arthritis) between 3-12 months of placement… what is the likely organism
Staphylococcus epidermidis
If patient has prosthetic joint infx (septic arthritis) over 12 months from time of placement… what is the likely organism
Staphylococcus aureus
Gold standArd to diagnose septic arthritis
Arthrocentesis and culture
Can you do an arthrocentesis on a patient with skin/subq infx
No. Big CI
Do you do blood cultures in septic arthritis patients…
Well… if there is acute onset and fever… which is most patients
Preferred initial imaging for septic arthritis patients?
X-ray
Treatment overview for septic arthritis
Arthrocentesis (drainage to dryness). Empiric Abx
Septic arthritis in prosthetic joint usually requires what surgery?
A surgery to remove pus from joint
Empiric Abx for septic arthritis (gram +)
Vancomycin
Empiric Abx for septic arthritis (gram - cocci)
Ceftriaxone (ceftriacocci)
Empiric Abx for septic arthritis (gram - bacilli)
Cefepime (Pime = bacilli)
Targeted Abx for septic arthritis MRSA and MSSA
MRSA: vancomycin
MSSA: naficillin
Targeted Abx for septic arthritis (neisseria G)
Ceftriaxone
Osteoarthritis or RA… which has symmetrical involvement
RA
Radiological findings for OA
Joint space narrowing, subchondral sclerosis and cysts, osteophytes
First line treatment for OA
Exercise and weight loss
Before oral NSAID, how else can we admin NSAIDs in OA
Topical NSAID patch
Role of paracetamol/or intraarticular GC injections (in OA i think)
For short term relief when other medications are unsuitable
When to refer OA patient for joint replacement
If QoL is severely impacted, or other options are ineffective/unsuitable
First line for Juvenile idiopathic arthritis
NSAID
Some 2° causes of Pseudogout
Hyper parathyroidism, Hemochromatosis, chondrocalcinosis, joint damage