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J Am Soc Nephrol 15:1897-1903, 2004
© 2004 American Society of Nephrology

CLINICAL SCIENCE

Kidney Dysfunction, Inflammation, and Coronary Events: A Prospective Study

Eric L. Knight*,{dagger},§, Eric B. Rimm*,||, Jennifer K. Pai||, Kathryn M. Rexrode*,{ddagger}, Carolyn C. Cannuscio, JoAnn E. Manson*,{ddagger},||, Meir J. Stampfer*,|| and Gary C. Curhan*,{dagger},||

*Channing Laboratory, {dagger}Renal Division, {ddagger}Division of Preventive Medicine, Department of Medicine, Brigham and Women’s Hospital, Harvard Medical School; §Renal Unit, Department of Medicine, Massachusetts General Hospital, Harvard Medical School; and ||Department of Epidemiology, Harvard School of Public Health, Boston, Massachusetts; and Merck & Co., Inc., Whitehouse Station, New Jersey

Correspondence to Dr. Gary C. Curhan, Channing Laboratory, 181 Longwood Avenue, Boston, MA 02115. Phone: 617-525-2683; Fax: 617-525-2008; E-mail: gcurhan{at}partners.org

ABSTRACT. Kidney dysfunction and high C-reactive protein (CRP) levels are independently associated with coronary events. However, it is unclear whether the risk of coronary events associated with decreased kidney function is at least partially mediated by inflammation and whether the association between inflammatory biomarkers and coronary events is influenced by level of kidney function. With the use of a prospective, nested, case-control study design, the association among kidney function, inflammatory biomarker levels, and coronary events was studied. A total of 244 women who were participants in the Nurses’ Health Study and had no history of cardiovascular disease received a diagnosis of an incident coronary event (defined as nonfatal myocardial infarction or death as a result of coronary disease) during the follow-up period from 1990 to 1998 and were matched to 486 control subjects. Serum creatinine and inflammatory biomarker levels were measured in blood samples collected in 1989. Creatinine clearance (CrCl) was estimated using creatinine, age, weight, and height. In multivariate analyses, the odds ratio (OR) for a coronary event in women with an estimated CrCl <60 ml/min was 2.33 (95% confidence interval [CI], 1.01 to 5.38) compared with those with a CrCl ≥90 ml/min. When soluble tumor necrosis factor receptor (sTNFR) I and II levels were added into this model individually, the observed OR for women with CrCl <60 ml/min was attenuated. In analyses stratified by estimated CrCl, higher high-sensitivity CRP (hs-CRP), IL-6, and sTNFR I and II levels each were significantly associated with an increased odds of coronary events in women with an estimated CrCl ≤74 ml/min but not in women with an estimated CrCl ≥75 ml/min. The OR per 5-mg/L unit increase in hs-CRP was 1.68 (95% CI, 1.13 to 2.52) for women with an estimated CrCl ≤74 ml/min, compared with 1.23 (95% CI, 0.86 to 1.76) and 0.99 (95% CI, 0.76 to 1.29) for women with an estimated CrCl 75 to 89 and ≥90 ml/min, respectively (P = 0.004 for interaction). In conclusion, kidney dysfunction is associated with an increased odds of coronary events, and inflammation, as assessed by higher sTNFR I and II levels, may mediate some of this risk. Higher inflammatory biomarkers levels, specifically, hs-CRP, IL-6, and sTNFR I and II, were significantly associated with coronary events only in women with reduced kidney function. These findings warrant further investigation in other populations.




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