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Blood pressure variability increases risk for stroke death

ROCHESTER, Minn. -- Erratic blood pressure during the first hours after a stroke dramatically lowers the chances of survival. That's the finding of a Mayo Clinic study published in the current issue of the journal Neurology.

The researchers studied 71 emergency room patients with ischemic stroke symptoms of less than 24 hours. Blood pressures were checked every five minutes during the patients' stay in the emergency department. Results showed that patients with widely fluctuating blood pressure during the first three hours in the emergency room were much less likely to survive more than 90 days after the stroke.

"These data suggest that additional studies are needed to clarify the optimal management of blood pressure in the setting of acute ischemic stroke," says Latha Stead, M.D., Mayo Clinic emergency medicine specialist and lead author of the study. "Until those studies are performed, health care providers should be careful not to overtreat high blood pressure acutely after ischemic stroke and need to consider urgently supporting blood pressure in those patients in whom the blood pressure is low."

In an earlier study, also published in Neurology, the research team had shown that a low initial blood pressure in stroke patients upon arrival in the emergency department was an early indicator of poorer survival. This new research supports that finding, but clarifies that of all the aspects of blood pressure studied, the variability -- especially in diastolic blood pressure -- during the emergency room stay was the most predictive of a poor outcome. The researchers believe the increased mortality of patients in this study was due to impaired autoregulation of blood pressure and that those who had a more constant blood pressure had better flow of blood to the ischemic penumbra -- the part of the brain that lacked in blood supply, but had enough blood flow that it might still be saved with aggressive treatment. This differs f
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Contact: Robert Nellis
newsbureau@mayo.edu
507-284-5005
Mayo Clinic
27-Jun-2006


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