Rheumatology Flashcards
Synovial fluid:
- Non-inflammatory
- Inflammatory
- Septic
Non-inflammatory:
-WBC <2000, <=50% PMNs, clear
Inflammatory
-WBC 10,000-100,000, >50% PMNs, turbid
Septic
- WBC >50,000 (bacterial), >80-90% PMNs, Cloudy/Pus
- WBC 10-30k (fungal or mycobacterial),
- High Sp if > 100,000
Diagnosis of RA
> 6 weeks duration (cutoff for chronic)
Inflammation of multiple joints (small >large), symmetric
Elevated inflammatory markers
Seronegative RA
- Seronegative RA of the elderly (age >60, shoulder and hip predominant + small joints
- RS3PE
RS3PE features + Mx
remitting seroneg symmetrical synovitis w/ pitting edema
Male >70
Pitting edema over dorsum of the hands
Tx: Low dose steroids, NSAIDs, Plaquenil
Extra-articular Manifestations RA
CV: Increased CAD risk, myopericarditis
Resp: ILD (NSIP>UIP), pleural effusions, pulm nodules, bronchiolitis obliterans
Eyes: Scleritis
Haem: Anemia chronic disease, Felty (neutropenia, splenomegaly, RA), Non-hodgkin’s lymphoma
Neuro: C1-2 instability/ subluxation, carpal tunnel
Skin/Mucous membranes: Sicca, nodules, vasculitis, raynauds
Treatment acute RA flare
Steroids (PO/IM/IA)
NSAIDs
Chronic RA Treatment
1st line: DMARDs (low dz activity =Plaquenil, Mod/High activity = MTX; other options SZS, LEF)
2nd line: Combine DMARDs *triple therapy no longer recommended
3rd line: Biologics (TNFi with MTX, then Toci/ abatacept/ ritux/ -tinibs / apremilast). Increase freq >dose when flare. Do not combine biologics.
*use ritux if pt also has lymphoproliferative d/i where ritux indicated
Methotrexate toxicities
Mucositis, oral ulcers
Nausea, vomiting, GI upset
Hepatotoxicity - can still use MTX in NAFLD if LE and LFT N and no advanced fibrosis
Rash, Alopecia
Pancytopenia
Hypersensitivity pneumonitis
ILD (rare) - can still use MTX in parenchymal lung dz that is incidental, mild, stable
Pre-MTX investigations
CBC, liver enzymes, Cr
CXR (get baseline)
Hepatitis B and C
Management of MTX-related NV or stomatitis
Increase folate to 5mg
Start ranitidine/PPI - for NV/GI upset
Trial leukovorin post MTX dose
Tx MTX related transaminitis
If <2x ULN: Decrease dose, do not need to hold
If >2x ULN: Hold, trend LE, resume at lower dose 1-2 wks post normalization
Tx MTX related cytopenia
Mild: Decrease Dose
Moderate-Severe: Hold, resume at lower dose once recovered
Tx MTX related pneumonitis
Discontinue permanently
Side effects leflunomide
Teratogenicity Rash Hepatotoxicity Cytopenias Peripheral neuropathy GI: N/V/D, abdo pain, dyspepsia
Side effects plaquenil
Retinotoxicity Photosensitivity Rash Myotoxic (rare) Cardiotoxic (rare)
Pre-biologic work-up for rheumatology
TBST or IGRA (if prev BCG)
CXR (if + TBST or high risk for Tb), if + –> sputum AFB
Hepatitis B sAg, sAB, cAb, HCV (treat concurrently if +)
CBC, Cr, LFTs
Pregnancy and RA
Plaquenil, SSZ, biologics safe
D/C methotrexate 1-3 months pre-conception (F)
D/C leflunomide 2 yrs pre-conception (or test lvls +/-cholestyramine washout)
Males preconception: Avoid Cyclo and thalidomide, MTX ok
Taper pred to <20 mg/day (<20 ok in preg)
Avoid NSAIDs esp in T3
Breastfeeding: Biologic and SFZ ok (risk of kernicterus), avoid MTX and LFD
Can flare postpartum (remission intrapartum)
Joint distribution in AS
Symmetrical Axial and SI involvement
Asymetrical large joints (if present)
Joint distribution in PsA
Asymmetrical axial/SI involvement (if present)
Peripheral can be either:
1) Asymmetric large joint
2) Symmetric small joint
Joint distribution in Reactive arthritis
Asymmetric large joint (mono or oligo)
+/- Asymmetric SI involvement
Joint distribution in IBD-associated arthritis
Type 1= Asymmetric large joint, assoc’d w/ bowel activity
Type 2= Symmetric small joint, indep of bowel
X-ray features in seronegative arthritis
SI: Sclerosis, Erosions, Ankylosis
Spine: syndesmophytes
MRI features in seronegative arthritis
Bone marrow edema
Syndesmophytes
Periosteal new bone formation (PsA)
Treatment seronegative arthritis
PT/Exercise/Smoking cessation for all
1st line: Trial of NSAIDs max dose daily x1 month
2nd line: Alternate NSAID x1 month
3rd line:
- If axial: anti-TNF –> IL-17 (secukinumab or ixekizumab) –> JAKi (Tofa)
- If peripheral: DMARDs (MTX, Sulfasalazine) - no role in axial
Risk factors for gout
M or Post-menopausal F Obesity, Metabolic syndrome CKD Hyperuricemia: TLS, hemolysis, polycythemia Meds: HCTZ, ASA, Pyrazinamide Diet: beer, meat, seafood
Treatment of Gout flare
NSAIDs
Colchicine (1.2mg load –> 0.6mg 1 hr later –> 0.6 BID till Sx resolve) - S/E: N/V?D, myopathy, renal dose
IA/PO steroid (if contraindications to above)
Anakinra (IL-1 blocker) - if frequent flares and C/I to above
Indications for urate lowering therapy
1) 2+ gout flares/year
2) Erosive gouty arthropathy
3) Tophi
4) 1 gout attack +
- Stg 3+ CKD
- Urolithiasis
- Uric acid >535
Urate lowering therapy
Overlap w/ NSAID/colch x 3-6mo:
1st line: Allopurinol* 100mg/d (50mg if CKD IV)
2nd line: Febuxostat (increased CV and all cause mortality, ie not if hx CVD or new CVD event)
Target uric acid <356
*In SE asian or african - test HLA-B 5801 1st bc risk SJS
CPPD features and RF
Rhomboid shaped, positively birefringent (blue parallel)
Chondrocal on XR
RF: Hypothyroidism, HyperPTH, HypoMg, HypoPO4 Hemochromatosis, Wilsons Amyloidosis Acromegaly
Acute destructive calcific tendinitis in older patient
Hydroxyapetite crystal arthropathy
SLE ACR Criteria
+ ANA 1:80 + Score >= 10 points from crit below
1) Constitutional Sx- Fever >38.3
2) Mucocutaneous: Non-scarring alopecia, discoid rash, malar rash, oral ulcers, photosensitive rash
3) Haem: low WBC <4, low plts <100, AIHA
4) Serosal: Pericarditis, pleuritis, effusions
5) CNS: Seizures, psychosis, delirium
6) Renal: Class II-V, proteinuria >0.5g/d
7) MSK: synovitis, arthalgias with morning stiffness
8) Serology +: Anti-dsDNA, Anti-Sm
9) Complements low
10) Positive APLA
*req 1 clinical criteria, and occurrence at least once is sufficient. Count highest score in each domain.
Lupus serology
ANA - sensitive, not spec
Anti-dsDNA - spec, not sensitive. Specific for SLE nephritis. Can be used to monitor dz activity.
Anti-Sm - specific, not sens
Other: histone, RNP, Ro, La
DDX ANA Positivity
AI Dz: RA, MCTD, Scleroderma, Myositis GI: Autoimmune hepatits, IBD, PBC Endo: AI thyroid disease Resp: IPF ID: HepC, TB, Parvovirus
Treatment SLE Nephritis
Class I/II: Supportive +/- immunosuppress if proteinuria >3g/d
Class III/IV (proliferative)
- Induction: Pulse steroids + Cyclo or MMF (if African or Hispanic) + ACEi if proteinuria
- Maintenance: MMF or Azathioprine, low dose pred. Ritux if refractory + ACEi if proteinuria
- In pregnancy: Stop ACEi, continue HCQ (+/- Aza for severe flare) and start ASA 12-36wks GA
Class V (membranous): BP Control, ACEi, consider immunosuppression if progressive renal function decline (re-bx)
SLE Manifestations and Tx: Mild, Mod, Severe
Mild: fever, mild arthritis, rash, mild cytopenias, plt 50-100
- HCQ +/- PO/IM steroid
- If refractory: +/- MTX or Aza
Moderate: RA-like arthritis, cutaneous vasculitis, serositis, moderate cytopenias Plt 20-50
- HCQ +/- PO/IM steroid +/- MTX or Aza
- If refractory: MMF or cyclosporin or Belimumab
Severe: CNS, class 3/4 nephritis, myelitis, pneumonitis, mesenteric vasculitis, severe cytopenias Plt <20, TTP, AIHA
- HCQ +/- PO/IM steroid +/- MMF or Cyclo
- If refractory: cyclo or ritux
Treatment Thrombotic-APS
Lifelong anticoagulation with warfarin
Transition to therapeutic LMWH in pregnancy and add ASA
Treatment OB-APS
Only requires prophylactic LMWH in pregnancy and post-partum + ASA
Management of SLE in pregnancy
- Meds
- Ro/La
- Positive aPL
HCQ in all, ASA 81 prior to 16wks GA for preeclampsia ppx
Azathioprine + steroid reasonable in severe disease
If Ro/La+: serial fetal echo from wk 16-26wks;
q1w if previous neonatal lupus.
-Dex if 1st/2nd deg heart block, not for 3rd
Positive aPL:
- No APS = ASA
- OB APS = ASA + ppx heparin until 6-12 wks pp
- Thrombotic APS = ASA + therapeutic heparin during preg and PP
Manifestations of Sjogren’s
Xerostomia (unstim saliv flow dx) Keratoconjunctivitis (Schirmer's test <5mm in 5 min) Arthritis Parotiditis (salivary gland bx shows focal lymphocytic sialadenitis) Peripheral neuropathy Type 1 RTA Secondary vasculitis B cell lymphoma (40x risk)
Diffuse Scleroderma - Manifestations
Sclerodactyly proximal to elbows/knees Face tightening Raynauds ILD > PH (TTE and PFTs for all pt) Scleroderma renal crisis