Survival difference are not black and white

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 —which may be due to conditions such as infections, inflammatory illnesses, periodontal disease, chronic lung disease, and obesity—increase 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 (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 dialysis, half of whites in the study had heart disease compared with a third of African Americans.) Alternatively, African Americans and whites may simply respond differently to inflammation, which implies that some genetic trait allows African Americans to "handle" it better than whites.

"Our findings challenge the long held notion that African Americans do better than whites on dialysis. If we can determine, and somehow modify the impact of inflammation, we may be able to improve survival for all patients treated with ," said Dr. Crews.

More information: The article, entitled "Inflammation and the Paradox of Racial Differences in Dialysis Survival," is online at http://jasn.asnjournals.org/. doi: 10.1681/ASN.2011030305

Related Stories

Sickle cell trait is not risk factor for kidney disease

date Sep 14, 2011

Researchers at Wake Forest Baptist Medical Center report that sickle cell trait is not a risk factor for the development of severe kidney disease in African-Americans. This study, published in the August online issue of Kidney In ...

Recommended for you

Third Minnesota turkey farm hit by bird flu outbreak

date Mar 28, 2015

An outbreak of a bird flu strain that's deadly to poultry deepened Saturday when state and federal officials confirmed a third Minnesota turkey farm has been infected, this time in one of the state's top poultry producing ...

User comments

Adjust slider to filter visible comments by rank

Display comments: newest first

Nerdyguy
Dec 07, 2011
"Survival difference are not black and white"

Editings are in needed of.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.