Mssk Flashcards
Markers of inflammation
CRP ESR
-go up in anything with active disease activity not specific
ESR
Rises with age, higher in women, not specific
But good suspicion of active disease process
=polymyalgia wheumatica and giant cell arteritis
CRP
Synthesized in liver
Proinflammatory cytokines increase it
Can activate complement and promote phagocytosis
-assess disease activity >8 mg/l is inflammatory
Rises and falls quicker and falls quicker than ESR
Active inflammatory process
CRP and ESR
CRP falls faster and goes up faster than ESR
What else goes up with inflammation
Leukocytosis, thrombocytosis, ferritin, fibrinogen and complement increase
Rheumatoid factor
IgM antibody to IgG
Can be IgA, IgG and IgM but it is most common
Made by B cells in synovial joints of RA patients
Not pathonomunoic
In 70% and in other diseases
What is have nodular RA-bump on surface or ACL
They have rheumatoid factor 100% of the time
NODULAR
What percent of healthy patients have RF
4%
RA in other conditions
Sjorgen, cryoglobinemia, primary biliary cirrhosis, mixed connective tissue, endocarditis, SLE, sarcoidosis, malignancy, lung diseases, LUPUS
Associated with joint erosions-higher value more aggressive disease
What is a positive RF
45 IU/ml
What percent RA have no RF
20-30
But if positive higher the more aggressive the disease process
Anti citrullinated proteins anti CCP
Specific marker -more than RF
96% specific and 78% sensitivity
Associated with aggressive erosive disease
If get both positive CCP and RF
99.5% likelihood RA
More aggressive and erosive
Anti nuclear antibody
Not pathonumonic of anything can be in 20-30% of normal ppl don’t hang hat on one test
Homogenous pattern ANA
Histone antibody >95% drug induced lupus
Drugs
Rim pattern ANA
Anti DS DNA SLE
Speckled ANA
Anti SM lupus
Anti SSA SSB in sjorgen
Anticentromere antibody ANA
Scleroderma CREST/PSS
Anti scl-70
PSS/CREST
ACA
Scleroderma
Labs of lupus
Proteinuria>500 or >3 + or casts
Neurologic-seizures psychosis
Hematologists-hemolytic anemia with reticulocytosis, coombs test positive, leukopenia, lymphopenia, thrombocytopenia
-markers!!
Antibodies of lupus
Anti DNA Anti SM Syphilis Antiphospholipid antibodies based on IgG or IgM cardiolipin Positive lupus anticoagulant False RPR
ASO and anti DNAase B titers-reflective of streptococcal exposure
ASO and DNAase B titers
Group A strep causes strep throat and rheumatic fever
Can target kidney-glomerular problem
Heart-valvular problem
Bones-large joints and small joints polyarticular (more than 1)
-may cause post streptococcal reactive arthritis-small joints
46 yo male fatigue malaise, pain in both wrists and bl swelling over MCP (symmetry)
Decreased ins trength in both hands, swollen wrists, PIP, MCP nodule on extensor surface of left arm . What lab test think abnormal
Positive anti CCP elevated ESR and elevated RF