Seasonal Variations in Gout Attacks and Serum Urate Levels: A Cohort Analysis
Overview
This retrospective cohort study analyzed UK primary care data to investigate seasonal patterns in gout flares and serum urate (SU) levels in patients not treated with urate-lowering therapy (ULT). It confirmed seasonal variation in gout attacks, with the highest flare rates in summer, and explored the complex relationship between SU levels, temperature, and flare occurrence.
Background
Gout is the most common inflammatory arthritis worldwide, characterized by acute flares due to monosodium urate crystal deposition. The risk of flares increases with higher serum urate levels and is mitigated by ULT such as allopurinol. Seasonal variation in gout flares has been reported, with peak incidence differing by region, but the mechanisms remain unclear. Understanding the interplay between SU levels, temperature, and flare timing is important for optimizing gout management in primary care.
Data Highlights
The study utilized the Clinical Practice Research Datalink (CPRD) AURUM database, encompassing over 16 million UK patients. Inclusion criteria identified adults with incident gout diagnoses between 2010 and 2023, excluding those on ULT. Gout flares were defined by prescriptions or healthcare visits with gout codes plus treatment. Serum urate measurements were extracted and linked temporally to flares. The cohort was described by demographics, flare frequency, ULT use, and SU levels, with statistical analyses assessing associations with season and temperature.
Key Findings
Gout flares exhibited clear seasonal variation, with the highest incidence in summer in the UK cohort.
Serum urate levels showed a complex relationship with season and temperature, without a straightforward increase in spring or summer.
Higher SU levels were associated with increased risk of gout flares, consistent with known pathophysiology.
Serum urate testing was suboptimal, with approximately 40% of patients lacking SU measurements despite guideline recommendations.
ULT initiation was excluded to focus on natural SU and flare patterns, enhancing understanding of untreated gout dynamics.
Data suggested that factors beyond absolute temperature, such as dehydration or dietary triggers, may contribute to seasonal flare patterns.
Clinical Implications
Clinicians should be aware of the seasonal variation in gout flares, particularly the increased risk during summer months in the UK, and consider this when advising patients on flare prevention strategies. Regular serum urate monitoring remains essential but is underutilized; improving adherence to testing guidelines could enhance gout management. Understanding that SU levels and flare risk do not simply correlate with temperature alone may guide more personalized patient counseling regarding lifestyle and environmental factors.
Conclusion
This large UK cohort study confirms seasonal variation in gout flares and highlights the complex interplay between serum urate levels, temperature, and flare occurrence in untreated patients. Optimizing serum urate monitoring and recognizing seasonal risk patterns can improve gout management in primary care.
References
Dalbeth et al. 2023 -- Seasonal Variations in Gout Attacks and Serum Urate Levels: A Cohort Analysis
