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Report Reveals Increase In Blood Clot-Related Strokes Among Blacks


Study highlights:
- Tracking 1.3 million people in the Greater Cincinnati/Northern Kentucky area, researchers found that stroke incidence fell significantly in whites between 1999 and 2005, but not among blacks.
- There was no racial difference in whether a stroke led to death.
DALLAS, May 20 /PRNewswire-USNewswire/ -- The incidence of blood clot-related strokes fell among whites in the Greater Cincinnati/Northern Kentucky area for the first time, according to long-term surveillance study representative of strokes in blacks and whites nationwide reported in Stroke: Journal of the American Heart Association.
(Logo: http://www.newscom.com/cgi-bin/prnh/20100222/AHSALOGO )
However, there was no decrease in stroke rates among blacks.
"It's encouraging that, for the first time ever in our study area, there is a drop in the most common type of stroke," said Dawn Kleindorfer, M.D., lead author of the study and assistant professor of neurology at the University of Cincinnati. "However, it's very disappointing that the racial disparity seems to be getting worse."
Investigators found that the age-adjusted annual rate of ischemic stroke (those caused by a blood clot) resulting in hospitalization changed between 1999 and 2005 from:
189 to 167 per 100,000 overall, an 11.6 percent drop;
180 to 154 per 100,000 among whites, a 14.4 percent reduction;
263 to 275 per 100,000 among blacks, a 4.6 percent rise, but not a significant change.

The patterns remained the same when out-of-hospital strokes were included. During the same period, researchers found no change in the rate of hemorrhagic strokes (those caused by bleeding).
The likelihood of dying after an ischemic stroke remained steady over time and was similar in whites and blacks, about 10 percent, according to the report.
Researchers used data from the Greater Cincinnati/Northern Kentucky Stroke Study, which gathered information on all first strokes occurring in a five-county area with 1.3 million people. The counties include urban, suburban and rural areas. It's comparable to the nation in education, income and in the percentage of blacks (18 percent), but does not include a substantial proportion of persons of Hispanic ethnicity (less than 3 percent).
"When you look at national maps on mortality, you see many more stroke deaths in blacks," Kleindorfer said. "According to our data, this occurs because blacks are far more likely to have a stroke to begin with, not because they are more likely to die once the stroke happens."
The racial disparity could not be explained by differences in the occurrence and treatment of stroke risk factors. According to a telephone survey conducted in the study area, blacks were more likely than whites to have been diagnosed with risk factors such as high blood pressure and diabetes, but they were also more likely to be receiving treatment for these conditions.
"We've done a lot of work in the community to increase stroke awareness and encourage prevention, but the stroke rates are absolutely stable in blacks," Kleindorfer said.
The investigators are collecting 2010 data in their ongoing phase of their epidemiology of stroke project.
Stroke is the third leading cause of death in the United States and a leading cause of major disability in adults.
Co-authors are Jane Khoury, Ph.D.; Charles J. Moomaw, Ph.D.; Kathleen Alwell, R.N.; Daniel Woo, M.D.; Matthew L. Flaherty, M.D.; Pooja Khatri, M.D.; Opeolu Adeoye, M.D.; Simona Ferioli, M.D.; Joseph P. Broderick, M.D.; and Brett M. Kissela, M.D. Individual author disclosures are on the manuscript.
The study is supported by the National Institute of Neurological Disorders and Stroke.
Statements and conclusions of study authors published in American Heart Association scientific journals are solely those of the study authors and do not necessarily reflect the association's policy or position. The association makes no representation or guarantee as to their accuracy or reliability. The association receives funding primarily from individuals; foundations and corporations (including pharmaceutical, device manufacturers and other companies) also make donations and fund specific association programs and events. The association has strict policies to prevent these relationships from influencing the science content. Revenues from pharmaceutical and device corporations are available at www.americanheart.org/corporatefunding.
NR10 – 1076 (Circ/Kleindorfer)
Editor's notes:
May is American Stroke Month. For more information on stroke, visit the American Stroke Association Web site: strokeassociation.org
For information on Power To End Stroke – an aggressive stoke education and awareness campaign aimed at reaching African Americans – visit Powertoendstroke.org or call 1-888-4-STROKE.

Additional resources:
Downloadable video interview clips with Ralph Sacco, M.D., neurologist and President-elect of the American Heart Association may be found here.
Downloadable stock footage and animation are available at www.americanheart.mediaroom.com, click on "Multimedia Resources."

SOURCE American Heart Association 



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