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Serum uric acid levels and gout: what does this herald for the population?
1Division of Public Health, Nuffield Institute for Health, University of Leeds, U.K.
Insights
The Rome and New York criteria for diagnosing gout were compared. Podagra attacks were the most effective diagnostic indicator, while serum uric acid levels showed age-related variations.
Area of Science:
- Rheumatology
- Gout Diagnosis
- Clinical Criteria Evaluation
Background:
- Gout diagnosis relies on clinical criteria, but their comparative effectiveness is not fully established.
- Existing criteria, such as Rome and New York, require evaluation for optimal diagnostic accuracy.
Purpose of the Study:
- To compare the diagnostic performance of the Rome and New York criteria for gout.
- To identify the most effective individual criteria for gout diagnosis.
Main Methods:
- Statistical indices including sensitivity, specificity, and log-likelihood ratio were calculated.
- The Rome and New York criteria were applied to 59 gout patients and 761 non-gout controls.
Main Results:
- Podagra attacks were the most valuable diagnostic criterion (relative value 194).
- Tophus presence was the least valuable criterion.
- Serum uric acid (SUA) levels demonstrated age and sex-specific distributions, with higher mean levels in males (294 mumol/l) than females (230 mumol/l).
Conclusions:
- Podagra attacks are a highly effective indicator for gout diagnosis.
- The absence of a lower SUA threshold for gout diagnosis supports its removal from diagnostic criteria sets.
Objective:
To compare the Rome and New York criteria for gout.
Methods:
The Rome and New York criteria were compared in 59 patients with gout and in 761 with non-gout by calculating statistical indices such as sensitivity, specificity, relative value (sensitivity + specificity) and the log-likelihood ratio.
Results:
The best individual criterion was one or more attacks of podagra (New York version) which had a relative value of 194. In contrast, the presence of a tophus was the least valuable criterion with a discriminatory value which was less than three times the most valuable (podagra). The rarity with which either response to Colchicine therapy or measurement for urate crystals were sought makes them poor criteria. Serum uric acid (SUA) followed an approximate Normal Distribution in both sexes, although there were some interesting differences across age strata. In males, SUA showed a progressive rise with age interrupted by a hiccup in the mid-40s. In females, SUA fell slowly as menstruation started, followed by a gradual postmenopausal rise. The mean SUA in males was 294 mumol/l (95% CI = 278-330 mumol/l) and in females 230 mumol/l (95% CI = 224-236 mumol/l).
Conclusion:
Despite higher levels of SUA in gouty patients, there was no lower level of SUA from which gout was not diagnosed, which vindicates its removal from the New York criteria set.