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Anemia Drugs Could Pose Threat to Some Kidney Patients
Date:9/15/2010

By Serena Gordon
HealthDay Reporter

WEDNESDAY, Sept. 15 (HealthDay News) -- When people with chronic kidney disease and type 2 diabetes take certain anemia drugs, the level of hemoglobin cells in their blood should go up.

But a new study finds that if those levels don't increase by much, these "poor responders" experience a significantly increased risk of heart problems and death.

Reporting in the Sept. 16 issue of the New England Journal of Medicine, a team of international researchers says that those who had the worst response to erythropoiesis-stimulating agents (ESAs) -- drugs that include Aranesp, Epogen and Procrit -- had a 31 percent rise in the risk of cardiovascular complications and a 41 percent increased risk of death.

"For people who have chronic kidney disease, I think this is further evidence that we have to be extremely cautious when we use ESAs. There is a potential for harm. The patients who respond poorly are the ones who get the most drug, and we may be putting them at increased risk," said the study's lead author, Dr. Scott Solomon, director of noninvasive cardiology at Brigham and Women's Hospital and an associate professor of medicine at Harvard Medical School in Boston.

"What we can't determine from this study is if these patients had worse outcomes because they were sicker to begin with, or because they got more of the drug, or some combination of the two," added Solomon.

When someone has kidney disease, the kidneys may not produce enough of the hormone erythropoietin to prevent anemia, a deficiency in red blood cells. Symptoms of anemia include fatigue and pale skin, and it can even contribute to heart disease, according to the U.S. National Institute of Diabetes and Digestive and Kidney Diseases.

ESAs were developed to replace the missing erythropoietin in kidney patients and stimulate red blood cell production. But these drugs can cause serious, even life-
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