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Kidney Disease Increases the Risk of Stroke in Patients With the Most Common Type of Heart Arrhythmia, According to Kaiser Permanente Study
Date:3/4/2009

OAKLAND, Calif., March 4 /PRNewswire/ -- Chronic kidney disease increases the risk of stroke in patients with atrial fibrillation (AF), the most common type of heart arrhythmia, according to a new study by Kaiser Permanente researchers in the current online issue of Circulation.

It has long been known that chronic kidney disease is a risk factor for cardiovascular disease. This study is the first to look at whether chronic kidney disease independently increases risk of stroke in patients with AF. AF occurs when rapid, disorganized electrical signals in the heart's two upper chambers (the atria) cause the heart to contract fast and irregularly, they explain.

The finding is an important addition to the evidence base because atrial fibrillation affects more than 2.2 million Americans, particularly those 75 and older, and increases the risk of stroke nearly four fold, according to the researchers. In this study, the researchers looked at whether kidney disease increased the risk of ischemic stroke -- the most common kind of stroke that occurs when an artery to the brain in blocked.

The risk of stroke varies according to several demographic and clinical characteristics and current risk assessment strategies can be limited, according to the study's lead author Alan S. Go MD, Director of the Comprehensive Clinical Research Unit at the Kaiser Permanente Division of Research. "Our study suggests that kidney function may provide an additional clue about how to best assess stroke risk and decide upon the best prevention strategy for patients with AF," Go said.

The research is part of the Anticoagulation and Risk Factors in Atrial Fibrillation (ATRIA) study, a decade-long, multi-center study looking at the risk factors for complications related to atrial fibrillation. In the ATRIA Study cohort of 13,535 adults with AF, the researchers assessed kidney function in two ways and found that a lower level of kidney function was associated with a graded, increased risk of ischemic stroke and blood clots that travel through the circulatory system, independent of known risk factors for AF. The magnitude of the associations for both measures of kidney function was in the range seen for other known stroke factors in AF patients, such as older age, heart failure, hypertension, diabetes, and being female.

Kidney disease may increase the risk of stroke in patients with AF by causing inflammation and stiffening of arteries. Also, decreased kidney function itself may be a marker for the build up of plaque in the arteries, explains Go.

In addition to the large, diverse sample of patients with AF, this study was strengthened by long-term longitudinal information on kidney function and the ability to characterize periods off anticoagulants, validating the occurrence of ischemic stroke, and the accounting for the presence of other known risk factors for stroke during follow up.

Additional researchers on this study include: Margaret C. Fang, MD, MPH; Natalia Udaltsova PhD; Yuchiao Chang, PhD; Niela K. Pomernacki, RD; Leila Borowsky, MPH; and Daniel E. Signer, MD on behalf of the ATRIA Study Investigators. Funding for this study was provided by the National Institute of Aging and by The Edith and Eliot B. Shoolman Fund of the Massachusetts General Hospital.

About the Kaiser Permanente Division of Research (http://www.dor.kaiser.org/)

The Kaiser Permanente Division of Research conducts, publishes, and disseminates epidemiologic and health services research to improve the health and medical care of Kaiser Permanente members and the society at large. It seeks to understand the determinants of illness and well-being and to improve the quality and cost-effectiveness of health care. Currently, DOR's 400-plus staff is working on more than 250 epidemiological and health services research projects.

About Kaiser Permanente Research

Kaiser Permanente's eight research centers comprise one of the largest research programs in the United States and engage in work designed to improve the health of individuals everywhere. KP HealthConnect(TM) , Kaiser Permanente's electronic health record, and other resources provide population data for research, and in turn, research findings are fed into KP HealthConnect(TM) to arm physicians with research and clinical data. Kaiser Permanente's research program works with national and local health agencies and community organizations to share and widely disseminate its research data. Kaiser Permanente's research program is funded in part by Kaiser Permanente's Community Benefit division, which in 2007 directed an estimated $1 billion in health services, technology, and funding toward total community health.

About Kaiser Permanente

Kaiser Permanente is America's leading integrated health plan. Founded in 1945, the program is headquartered in Oakland, Calif. Kaiser Permanente serves 8.6 million members in nine states and the District of Columbia. Today it encompasses Kaiser Foundation Health Plan, Inc., Kaiser Foundation Hospitals and their subsidiaries, and the Permanente Medical Groups. Nationwide, Kaiser Permanente includes approximately 164,000 technical, administrative and clerical employees and caregivers, and 14,000 physicians representing all specialties. The organization's Labor Management Partnership is the largest such health care partnership in the United States. It governs how more than 130,000 workers, managers, physicians and dentists work together to make Kaiser Permanente the best place to receive care, and the best place to work. For more Kaiser Permanente news, visit the Kaiser Permanente News Center at: http://xnet.kp.org/newscenter

www.kaiserpermanente.org


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