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:
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 dialysis," said Dr. Crews.
|Contact: Adrienne Lea|
American Society of Nephrology