Stroke and blood pressure
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Blood Pressure as a Key Risk Factor for Stroke
High blood pressure (hypertension) is the most important and prevalent risk factor for both the first occurrence and recurrence of stroke. Studies consistently show that even small, sustained differences in blood pressure can significantly affect stroke risk. For example, a long-term reduction of just 9/5 mmHg in blood pressure is linked to about a one-third lower risk of stroke, regardless of whether a person is already hypertensive or not 124. This relationship is continuous and consistent across different ages, sexes, and regions, and applies to both fatal and nonfatal strokes 24.
Blood Pressure Lowering for Stroke Prevention
Lowering blood pressure through medication or lifestyle changes is proven to reduce the risk of stroke. Randomized controlled trials and meta-analyses show that a reduction of 10 mmHg in systolic blood pressure can lower stroke risk by about one third 1245. The benefits are seen in both people with and without a history of cardiovascular disease, and the effect is greater with larger reductions in blood pressure 245. For secondary prevention (after a stroke), intensive blood pressure lowering to below 130/80 mmHg further reduces the risk of another stroke, especially for those at high risk of intracranial hemorrhage .
Blood Pressure Management in Acute Stroke
Managing blood pressure in the acute phase of stroke is complex and controversial. High blood pressure is common immediately after a stroke and is associated with worse outcomes, including higher rates of death, dependency, and stroke recurrence 37910. However, both very high and very low blood pressure levels are linked to poor outcomes, forming a U-shaped relationship. The best outcomes are generally seen with systolic blood pressure between 140 and 180 mmHg during the acute phase 910.
There is evidence that moderate lowering of blood pressure in acute stroke may improve outcomes, but aggressive lowering can be harmful, especially in ischemic stroke, where it might reduce blood flow to the brain 3578+1 MORE. In acute intracerebral hemorrhage, immediate blood pressure lowering to below 140 mmHg is recommended, while in acute ischemic stroke, early blood pressure lowering is usually not advised unless blood pressure is extremely high 56.
Individualized Blood Pressure Targets
Guidelines now recommend individualized blood pressure targets based on stroke type and patient risk factors. For most patients, a target of less than 130/80 mmHg is advised for long-term prevention, but a more cautious approach is needed for those with severe cerebrovascular disease or during the acute phase of stroke . The choice of blood pressure-lowering medication is less important than achieving and maintaining the target blood pressure 246.
Conclusion
High blood pressure is a major, modifiable risk factor for stroke. Lowering blood pressure significantly reduces the risk of both first and recurrent strokes. In the acute phase of stroke, careful management is needed, as both high and low blood pressure can worsen outcomes. Long-term, individualized blood pressure control is essential for effective stroke prevention and improved patient outcomes.
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