[Gout - a common and well known disease]

Area of Science:

• Rheumatology
• Metabolic Disorders
• Crystal Arthropathies

Background:

• Hyperuricemia is defined by blood urate levels exceeding 405 µmol/L, the threshold for crystal formation.
• Gout, a common crystal arthropathy, affects 1.7% of the Swedish population, with an incidence of ~200 per 100,000 person-years.
• Gout attacks manifest as acute arthritis, typically in the foot, and can progress to chronic arthritis with tophi formation.

Purpose of the Study:

• To review the definition, clinical presentation, and diagnostic approaches for hyperuricemia and gout.
• To highlight the limitations of traditional diagnostic methods in primary care settings.
• To discuss the role of emerging imaging technologies in gout diagnosis.

Main Methods:

• Literature review of hyperuricemia and gout diagnosis.
• Analysis of diagnostic criteria and imaging modalities.
• Epidemiological data review for gout prevalence and incidence.

Main Results:

• Gout diagnosis in primary care often relies on clinical criteria due to the infrequent use of joint fluid aspiration for crystal identification.
• Polarization microscopy of joint fluid remains the gold standard for definitive gout diagnosis.
• Ultrasound and dual-energy CT are emerging as valuable tools for diagnosing gout when joint aspiration is not practical.

Conclusions:

• Accurate diagnosis of gout is crucial for effective management and prevention of chronic complications.
• Integrating advanced imaging techniques can improve gout diagnosis rates, especially in primary care.
• The prevalence and incidence of gout appear to be increasing over time.