Inflammation may increase stroke risk in men with hypertension

DALLAS, Nov. 1 Proteins associated with inflammation may help identify different levels of stroke risk in men who have hypertension, Swedish researchers report in today's rapid access issue of Stroke: Journal of the American Heart Association.

Although hypertension (high blood pressure) is a major risk factor for stroke, many people with the disease don't have strokes. Even among people with similar blood pressure levels, stroke risk varies considerably. This led researchers to investigate whether low-grade inflammation could contribute to stroke risk in men with high blood pressure. Inflammation is the process by which the body responds to injury.

The study found that men with systolic blood pressure (the top number in a blood pressure reading) at or above 140 millimeters of mercury (mm Hg) and elevated levels of inflammation-sensitive plasma proteins (ISP) were four times as likely to have a stroke as were men who had normal blood pressure and normal ISP levels. Moreover, the inflammatory proteins predicted stroke risk for 10 or more years.

"It is our conclusion that high ISP levels are associated with elevated blood pressure," says lead author Gunnar Engstrm, M.D., Ph.D., of Malmo University Hospital in Malmo, Sweden. "These proteins add to the risk of stroke among men with high blood pressure and provide information on stroke risk even after many years of follow-up."

Increased inflammation has been associated with strokes and heart attacks. Inflammation can lead to increases in blood levels of various ISPs, such as fibrinogen, alpha-1 antitrypsin, haptoglobin, ceruloplasmin and orosomucoid. The researchers sought to determine whether these ISPs may contribute to the variability in stroke risk in people with hypertension. They evaluated stroke risk, blood pressure and levels of the five different ISPs in 6,071 healthy Swedish men ages 28 to 61. The men were followed for an average of 18.7 years.

Researchers classified

Contact: Carole Bullock
American Heart Association

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