Gout Flashcards
What is podagra?
Acute inflammation of the 1st MTP joint with swelling, erythema, and tenderness
What clinical situations would give rise to podagra?
- Gout (or other crystal deposition dz like calcium pyrophosphate)
- Infectious arthritis (acute and monoarticular)
- Trauma
- cellulitis
What clinical features distinguish gout from rheumatoid arthritis?
RA: multiple joints, occurring over a longer time period. Both have nodules, but RA nodules are soft but firm (like an unripe fruit or lymph node) while gout nodules (aka tophi) are hard pebbles
What clinical features distinguish gout from psoriatic arthritis?
Usually psoriatic arthritis will also show nail pitting or a rash
What clinical features distinguish gout from osteoarthritis?
Osteo:Can affect the 1st MTP alone, but acuity and severity make this unlikely
What test would you order in a patient with acute monoarticular arthritis?
ALWAYS ASPIRATE THE JOINT! Analyze the fluid for crystals and WBC and gram stain
If you suspect gout, and draw a low uric acid level, what does that tell you?
Nothing. It could still be gout because uric acid decreases during an acute attack. If it’s high, then it is helpful in solidifying diagnosis
When considering potential treatments for gout, what would you want to know about the patient?
Renal and liver function. Some treatments increase risk of nephrolithiasis
Can you diagnose septic arthritis through blood cultures?
No. you need arthrocentesis as well.
What other diagnostics would you want in a patient with podagra?
GET AN X-RAY! Make sure it’s not trauma
What do gout crystals look like?
yellow when parallel to polarized light. negatively birefringent (blue when perpendicular to polarized light)
What is pseudogout?
Calcium pyrophosphate crystals CPPD.
What do CPPD crystals look like?
rhomboid shaped with opposite colorization to polarized light (i.e. yellow when perpendicular, blue when parallel) called a positive birefringence. Also, crystals are duller
If you see no organisms on gram stain, what does this tell you?
Less likely to be infectious arthritis, but you should still do cultures of the fluid
What are the X ray findings in gout?
punched out erosions.