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Study: High Blood Pressure Linked To Race, Sex

DALLAS  -- High blood pressure may help to explain why deaths from heart disease and stroke vary according to geography, race and sex, researchers reported in Hypertension: Journal of the American Heart Association.

"Where you live, your race, and your gender strongly influence your risk of developing high blood pressure as you move from young adulthood into middle age — and hypertension is a major risk factor for heart disease and stroke," said Deborah A. Levine, M.D., M.P.H., lead study author and assistant professor of internal medicine in the Departments of Medicine and Neurology at the University of Michigan Medical School in Ann Arbor.

Between 1968 and 2006, deaths from heart disease and stroke fell an impressive 65 percent, but everyone didn't share equally in the positive trend, she said. Cardiovascular deaths are still higher in the southeastern United States, in blacks compared with whites, and in men compared with women.

"The gaps may be widening, particularly for blacks," Levine said. "The reasons for the variations are not clear, so we examined whether high blood pressure might help to explain it."

The researchers examined data from the Coronary Artery Risk Development in Young Adults (CARDIA) study that followed young people from Birmingham, Ala.Chicago, Ill.Minneapolis, Minn. and Oakland, Calif., from the time they were 18-30 years old. Each center began the study with groups similar to each other for race, sex, and age. Among 3,436 participants who didn't have high blood pressure when the research began, and were followed for 20 years (when average age was 45), hypertension was diagnosed in:

  • 37.6 percent of black women; 34.5 percent of black men; 21.4 percent of white men and 12.3 percent of white women;
  • 33.6 percent of Birmingham residents; 27.4 percent in Oakland; 23.4 percent in Chicago and 19 percent in Minneapolis.

After adjusting for multiple risk factors, living in Birmingham significantly increased the chance that a person would develop high blood pressure.

"In addition, independently of where they live, blacks — especially black women — are at markedly higher risk of hypertension even after we took into account factors that are known to affect blood pressure, such as physical activity and obesity," Levine said.

More research is needed to understand the geographic and racial differences in high blood pressure documented in this study as well as the potential biological, environmental and genetic mechanisms, Levine said. "In the meantime, people at higher risk can benefit from close monitoring of their blood pressure and paying attention to risk factors such as obesity and physical activity."

Co-authors are: Cora E. Lewis, M.D., M.S.P.H.; O. Dale Williams, Ph.D.; Monika M. Safford, M.D.; Kiang Liu, Ph.D.; David A. Calhoun, M.D.; Yongin Kim, M.S.; David R. Jacobs Jr., Ph.D.; and Catarina I. Kiefe, Ph.D., M.D. Individual author disclosures can be found on the manuscript.

The research was supported in part by the National Heart, Lung, and Blood Institute.

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.


STORY TAGS: BLACK, AFRICAN AMERICAN, MINORITY, CIVIL RIGHTS, DISCRIMINATION, RACISM, , RACIAL EQUALITY, BIAS, EQUALITY, culture

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