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Survival difference are not black and white
Date:12/6/2011

Highlights

  • Among patients on dialysis, African Americans tend to live longer than whites
  • This survival difference only exists among patients with high levels of inflammation
  • Determining inflammation's role may improve survival for all patients treated with dialysis

Washington, DC In the general population, African Americans die at earlier ages than whites, but among patients on dialysis, African Americans live longer than whites. A new study helps explain this paradox and could help prolong the lives of all patients on dialysis. The study appears in the Journal of the American Society Nephrology (JASN), a publication of the American Society of Nephrology.

High levels of inflammationwhich may be due to conditions such as infections, inflammatory illnesses, periodontal disease, chronic lung disease, and obesityincrease dialysis patients' risk of dying prematurely. Deidra Crews, MD (Johns Hopkins University) and her colleagues wondered whether racial differences in inflammation might explain the survival paradox among dialysis patients.

The investigators followed 554 white and 262 African American dialysis patients from 81 clinics for an average of three years (range four months to 9.5 years). Among the major findings:

  • At five years, a lower percentage of African Americans (34%) died compared with whites (56%), as expected.
  • A survival advantage for African Americans only existed among patients with high levels of inflammation.
  • When comparing patients with lower levels of inflammation, African American and white patients survived for similar lengths of time.

What is it about inflammation that could lead to these findings? It's not clear yet, but the authors note that inflammation in whites may be caused mostly by heart disease, while in African Americans it may be due to other causes that have less detrimental effects on survival. (At the start of dialys
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Contact: Adrienne Lea
alea@asn-online.org
202-503-6560
American Society of Nephrology
Source:Eurekalert

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