[Crystal-induced arthritis--old but important]

Area of Science:

• Rheumatology
• Nephrology
• Metabolic Diseases

Context:

• Gout is the most prevalent inflammatory arthropathy affecting men.
• Asymptomatic hyperuricemia is common and primarily managed with dietary changes.
• Diminished renal excretion is the leading cause of elevated uric acid levels.

Purpose:

• To outline the pathological progression of hyperuricemia.
• To differentiate treatment strategies for acute gout attacks versus chronic conditions.
• To discuss the diagnosis and management of calcium pyrophosphate deposition arthropathy.

Summary:

• Acute gout attacks, often affecting the first MTP joint, are treated with NSAIDs or corticosteroids.
• Chronic gout, recurrent attacks, or urate nephropathy necessitate long-term therapy (≥5 years) with urate-lowering drugs like allopurinol or febuxostat.
• Calcium pyrophosphate deposition arthropathy, the second most common crystal arthropathy, is diagnosed via synovial fluid analysis or chondrocalcinosis, with treatments mirroring acute gout management.

Impact:

• Provides clear diagnostic and therapeutic guidelines for gout and related conditions.
• Highlights the importance of differentiating asymptomatic hyperuricemia from pathological gout.
• Emphasizes the need for sustained urate-lowering therapy in chronic gout and urate nephropathy.