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Original Research |

Low-Level Lead Exposure and the Prevalence of Gout: An Observational Study

Eswar Krishnan, MD, MPhil; Bharathi Lingala, PhD; and Vivek Bhalla, MD
[+] Article and Author Information

From Stanford University School of Medicine, Palo Alto, California.

Potential Conflicts of Interest: Disclosures can be viewed at www.acponline.org/authors/icmje/ConflictOfInterestForms.do?msNum=M11-1491.

Reproducible Research Statement:Study protocol: Not applicable. Statistical code: Available to potential collaborators by contacting the authors. Data set: Available in the public domain at www.cdc.gov/nchs/nhanes.htm.

Requests for Single Reprints: Eswar Krishnan, MD, MPhil, Stanford University School of Medicine, 1000 Welch Road, Suite 203, Palo Alto, CA 94304.

Current Author Addresses: Drs. Krishnan and Lingala: Stanford University School of Medicine, 1000 Welch Road, Suite 203, Palo Alto, CA 94304.

Dr. Bhalla: Stanford University School of Medicine, Division of Nephrology, 780 Welch Road, Suite 106, Palo Alto, CA 94304.

Author Contributions: Conception and design: E. Krishnan, V. Bhalla.

Analysis and interpretation of the data: E. Krishnan, B. Lingala, V. Bhalla.

Drafting of the article: E. Krishnan.

Critical revision of the article for important intellectual content: E. Krishnan, V. Bhalla.

Final approval of the article: E. Krishnan, B. Lingala, V. Bhalla.

Provision of study materials or patients: E. Krishnan.

Administrative, technical, or logistic support: E. Krishnan.

Collection and assembly of data: E. Krishnan, B. Lingala.


Ann Intern Med. 2012;157(4):233-241. doi:10.7326/0003-4819-157-4-201208210-00003
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Background: Blood lead levels (BLLs) less than 1.21 µmol/L (<25 µg/dL) among adults are considered acceptable by current national standards. Lead toxicity can lead to gouty arthritis (gout), but whether the low lead exposure in the contemporary general population confers risk for gout is not known.

Objective: To determine whether BLLs within the range currently considered acceptable are associated with gout.

Design: Population-based cross-sectional study.

Setting: The National Health and Nutrition Examination Survey for 2005 through 2008.

Patients: 6153 civilians aged 40 years or older with an estimated glomerular filtration rate greater than 10 mL/min per 1.73 m2.

Measurements: Outcome variables were self-reported physician diagnosis of gout and serum urate level. Blood lead level was the principal exposure variable. Additional data collected were anthropometric measures, blood pressure, dietary purine intake, medication use, medical history, and serum creatinine concentration.

Results: The prevalence of gout was 6.05% (95% CI, 4.49% to 7.62%) among patients in the highest BLL quartile (mean, 0.19 µmol/L [3.95 µg/dL]) compared with 1.76% (CI, 1.10% to 2.42%) among those in the lowest quartile (mean, 0.04 µmol/L [0.89 µg/dL]). Each doubling of BLL was associated with an unadjusted odds ratio of 1.74 (CI, 1.47 to 2.05) for gout and 1.25 (CI, 1.12 to 1.40) for hyperuricemia. After adjustment for renal function, diabetes, diuretic use, hypertension, race, body mass index, income, and education level, the highest BLL quartile was associated with a 3.6-fold higher risk for gout and a 1.9-fold higher risk for hyperuricemia compared with the lowest quartile.

Limitation: Blood lead level does not necessarily reflect the total body lead burden.

Conclusion: Blood lead levels in the range currently considered acceptable are associated with increased prevalence of gout and hyperuricemia.

Primary Funding Source: None.

Figures

Grahic Jump Location
Figure.

Association between BLL and the prevalence of gout (top) and serum urate level (bottom) within the nonelevated range of BLL.

The nonelevated BLL range is <1.21 µmol/L (<25 µg/dL). The x-axis presents BLLs stratified as quintiles. P < 0.001 for trends in gout and serum urate level. To convert BLL from µg/dL to µmol/L, multiply by 0.0483. To convert serum urate level from mg/dL to µmol/L, multiply by 59.485. BLL = blood lead level.

Grahic Jump Location

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Low Levels of Lead in the Blood and the Occurrence of Gout

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