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Gout, not induced by diuretics? A case-control study from primary care
H J E M Janssens1, E H van de Lisdonk, M Janssen
1Department of General Practice and Family Medicine, 229 University Medical Centre Nijmegen, PO Box 9191, 6500 HB Nijmegen, The Netherlands. h.janssens@hag.umcn.nl
Insights
Diuretics may not increase gout risk, contrary to common belief. This study found that cardiovascular conditions, not diuretic use, likely explain previous associations with gout incidence.
Area of Science:
- Cardiovascular Medicine
- Rheumatology
- Clinical Epidemiology
Background:
- The assumption that diuretics cause gout lacks robust scientific evidence.
- This study investigates the relationship between diuretic use and gout incidence.
Purpose of the Study:
- To determine the incidence of gout in patients using diuretics.
- To assess the influence of concurrent hypertension and cardiovascular diseases on gout risk.
Main Methods:
- A case-control study design was employed, identifying gout cases from a primary care population.
- Conditional logistic regression analyses were used to estimate incidence rate ratios (IRRs) for gout.
- Stratification analyses were conducted, particularly in non-diuretic users.
Main Results:
- Initial analysis showed higher gout IRRs associated with diuretic use, hypertension, and heart failure.
- After adjustment, the IRR for diuretic use significantly decreased, suggesting no direct link.
- Hypertension and heart failure remained associated with increased gout risk, even without diuretic use.
Conclusions:
- Diuretics do not appear to elevate the risk of developing gout.
- Confounding factors, specifically cardiovascular conditions, likely influenced prior assumptions about diuretics and gout.
Background:
It is taken for granted that diuretics may induce gout, but there is a general lack of evidence on this topic.
Objectives:
To determine the incidence of gout in patients who use diuretics, taking into account concurrent hypertension and cardiovascular diseases.
Methods:
A case-control study was designed. From a primary care population all patients with a first gout registration (59 men, 11 women; mean (SD) age 55.1 (13.5)) were identified as cases. To relate the occurrence of gout to diuretic use a matched reference series of three controls for each case was compiled. Conditional logistic regression analyses were applied to estimate incidence rate ratios (IRRs) of gout, and 95% confidence intervals (CIs), in subjects with and without diuretic treatment, hypertension, and cardiovascular diseases. Additional stratification analyses were made, particularly in the subjects not using diuretics.
Results:
The IRRs of gout in subjects with v those without diuretic treatment, hypertension, heart failure, and myocardial infarction were 2.8 (95% CI 1.2 to 6.6), 2.6 (95% CI 1.2 to 5.6), 20.9 (95% CI 2.5 to 173.8), and 1.9 (95% CI 0.7 to 4.7), respectively. After adjustment, the IRR of gout for diuretic use dropped to 0.6 (95% CI 0.2 to 2.0), while the IRRs of gout for hypertension, heart failure, and myocardial infarction were still >1. This was also the case for subjects with hypertension or myocardial infarction, who had not used diuretics.
Conclusion:
The results suggest that diuretics do not actually increase the risk of gout. Cardiovascular indications for treatment may have confounded previous inferences.
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