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Kidney disease worsens in a fourth of African-Americans despite therapy for hypertension

The best available treatment for chronic kidney disease from high blood pressure did not keep the disease from substantially worsening in about a fourth of African-Americans studied, according to long-term results of a National Institutes of Health study published April 28, 2008, in the Archives of Internal Medicine.

The largest and longest study of chronic kidney disease in African-Americans the African American Study of Kidney Disease and Hypertension (AASK) found that the disease substantially worsened in about one-fourth of participants, even with very good blood pressure control and use of kidney-protecting medications, currently the best available treatment. This subgroup of patients either lost half their kidney function or reached kidney failure, also known as end-stage renal disease.

"Despite these sobering results, blood pressure control is still vital in kidney disease and in many other diseases," said NIH Director Elias A. Zerhouni, M.D. "But this research clearly signals the importance of preventing kidney disease, better understanding causes and finding better ways to manage it in the 26 million Americans who already have it."

Good news also emerged from the study. About one-third of participants experienced a slow decline in kidney function, about what is generally observed with aging. "The factors that may be responsible for such a small loss of kidney function need to be studied," said Lawrence Y. Agodoa, M.D., senior author of the study and director of kidney failure research at NIHs National Institute of Diabetes and Digestive and Kidney Diseases (NIDDK), which funded the study.

The AASK Cohort Study observed about 750 African-Americans on recommended therapy for chronic kidney disease from 2002 to 2007. Study participants were initially recruited beginning in 1995 for the AASK Clinical Trial, which concluded in 2001 that an ACE inhibitor medication protected the kidneys better than two other classes of blood pressure drugs. During the Cohort Study, nearly 9 out of 10 participants were taking an ACE inhibitor or an angiotensin receptor blocking drug, and average blood pressure was 133/78 mmHg, close to national guidelines for high blood pressure in people with chronic kidney disease.

Uncontrolled high blood pressure, an increase in the number of people with diabetes, and the aging of the U.S. population means more people than ever are getting and living with kidney problems. About 13 percent of the U.S. population, up from 10 percent in 1994, now have chronic kidney disease. And in 2005, more than 485,000 people were on chronic dialysis or had a kidney transplant for kidney failure, costing Medicare, private insurers and patients $32 billion.


Contact: Mary Harris
NIH/National Institute of Diabetes and Digestive and Kidney Diseases

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