Rheumatology Flashcards
Red, hot, swollen joint. Next step?
arthrocentesis
Arthrocentesis Appearance: Serous WBC: < 200 Polys: < 25% Gram/Cx: (-) Crystals: (-)
Normal. Consider Osteoarthrosis
Arthrocentesis Appearance: Cloudy WBC: 200-50,000 Polys: > 50% Gram/Cx: (-) Crystals: +/-
Inflammatory
Arthrocentesis Appearance: Pus, opaque, white WBC: > 50,000 Polys: > 75% Gram/Cx: (+) Crystals: (-)
Septic arthitis
ANA. Interpretation?
Sensitive lupus
Rheumatoid factor. Interpretation?
Rheumatoid arthritis
Anti-CCP. Interpretation?
Rheumatoid arthritis
ds-RNA. Interpretation?
Lupus + renal involvement
Histone. Interpretation?
Drug-induced lupus
Centromere antibodies. Interpretation?
Scleroderma (CREST)
Topoisomerase. interpretation?
Systemic scleroderma
Smooth muscle antibody. Interpretation?
Autoimmune hepatitis
Ro+LA. Interpretation?
Sjogren’s
Jo. Interpretation?
Polymyositis, dermatomyositis
Anti-Mitochondrial antibodies. Interpretation?
Primary biliary cirrhosis
Black woman with malar rash, pleuritic chest pain, oral ulcers, pain in hips, elbows, knees, shoulders, and photosensitivity.
Test show anemia, leukopenia and thrombocytopenia.
Dx, next steps and tx?
Lupus
Next steps:
- 1st ANA: Sensitive test, gate test. If negative, it’s likely that it is not an autoimmune disease
- sd-DNA (nephritis)
- Anti-smith
- Urinalysis, proteinuria, renal function
- ESR, CRP
- Low C3 and C4
Treatment:
- Everyone: Hydroxychloroquine
- 2nd line: methotrexate
- Symptomatic: NSAIDs
- Azathioprine: adjunctive
- Flare: steroids
Patient taking hydralazine with malar rash, pleuritic chest pain, pain in hips, elbows, knees, shoulders, and photosensitivity.
Dx, next steps and tx?
Drug-induced lupus
Next step: Anti-histone antibody
Tx: Remove medication
Patient with Dx of lupus who has HTN and proteinuria.. Dx, next steps and tx?
Lupus nephritis
Next steps:
ds-DNA antibodies
Biopsy
Dx: IV cyclophosphamide mofetil then transition to oral mycophenolate
Fever, altered mental status, pleuritic chest pain. C3, C4 low. Dx?
Lupus flare.
45 y-o woman, morning stiffness of more than 60 mins, joint pain in > 3 small joints (hands, feet) symmetric and spares the distal interphalangeal (DIP).
Anti-CCP positive
Rx-Ray: erosion and periarticular osteopenia
Dx and Tx?
Rheumatoid arthritis
Tx:
Ibuprofen/meloxicam + Methotrexate
Anti-CCP vs Rheumatoid factor in rheumatoid arthritis
Anti-CCP: more specific–> if positive, it’s RA
Rheumatoid factor: more sensitive–> if negative, it’s NOT RA