Step 1 Basics (USMLE)

Rheum| Gout and Pseudogout


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4.10 Gout and Pseudogout

Rheumotology review for the USMLE Step 1 Exam.

Gout

  • Caused by uric acid crystal deposition due to purine metabolism.
  • Triggers inflammation when crystals precipitate in cooler joint fluid.
  • Presents with severe, red, and swollen monoarticular joints, often in the big toe.
  • Diagnosis through synovial fluid analysis.
  • Acute treatment: colchicine, NSAIDs, and glucocorticoids.
  • Preventive treatment: allopurinol, febuxostat, probenecid, and lifestyle changes.

Pseudogout

  • Resulting from calcium pyrophosphate crystal deposition, often due to ATP breakdown.
  • Manifests with painful, swollen joints, typically affecting multiple upper extremity joints, especially the knee.
  • Diagnosis through synovial fluid analysis.
  • Acute treatment resembles gout management.
  • No direct preventive treatment to lower calcium pyrophosphate levels.

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Step 1 Basics (USMLE)By Sam Smith

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