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Higher Levels of Bilirubin Linked to Reduced Risk of Respiratory Disease
Serum total bilirubin is routinely measured in the primary care setting to identify hepatobiliary (liver, gall bladder and bile ducts) and blood diseases. Bilirubin may have cytoprotective (cell protective) properties, including antioxidant and anti-inflammatory effects, according to background information in the article. "Experimental studies using animal models support a protective effect of increased bilirubin against respiratory injury by environmental stressors. The epidemiological relationship between bilirubin level and the risk of respiratory disease is not well characterized," the authors write.
Laura J. Horsfall, M.Sc., of University College London, and colleagues examined the association between serum bilirubin levels and the incidence of chronic obstructive pulmonary disease (COPD), lung cancer and all-cause death in a large population-based group of patients from the United Kingdom. The study included 504,206 adults from a U.K. primary care research database (the Health Improvement Network) with levels of serum bilirubin recorded between January 1988 and December 2008.
After various analysis and adjustment for several important health indicators, the researchers found that moderately higher levels of bilirubin within the range considered normal were associated with reduced risk of respiratory disease and all-cause mortality. Estimates for the incidence rate of lung cancer per 0.1-mg/dL increase in bilirubin level were an 8 percent decrease for men and an 11 percent decrease for women. The estimate for COPD in men per 0.1-mg/dL increase in bilirubin level was a 6 percent decrease, and for mortality in men was a 3 percent decrease. The results for COPD and mortality in women were similar. This study is published in the February 16 issue of JAMA.
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More News on: Acute Bronchitis, Hepatitis A, Hepatitis B, Respiratory Diseases, Asbestosis , Gilberts Syndrome
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