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The role of blood pressure lowering before and after stroke
Geoffrey A Donnan1, Stephen M Davis, Amanda Thrift
1National Stroke Research Institute, Austin & Repatriation Medical Centre, University of Melbourne, West Heidelberg, and Department of Neurology, Royal Melbourne Hospital, Parkville, Victoria, Australia. gdonnan@unimelb.edu.au
Insights
Lowering blood pressure effectively prevents strokes, both initially and recurrently. Evidence supports various agents for primary prevention and perindopril-based therapy for secondary stroke prevention, though its use in acute stroke remains uncertain.
Area of Science:
- Cardiovascular Medicine
- Neurology
- Hypertension Research
Background:
- Elevated blood pressure is a primary risk factor for stroke incidence and recurrence.
- Blood pressure management significantly impacts outcomes in patients experiencing acute stroke.
Purpose of the Study:
- To review recent randomized controlled trials (RCTs) on blood pressure management for stroke prevention and acute stroke care.
- To evaluate the efficacy of blood pressure lowering strategies in primary and secondary stroke prevention.
- To assess the current evidence regarding blood pressure management in acute stroke settings.
Main Methods:
- Analysis of findings from key randomized controlled trials including HOPE, LIFE, SCOPE, ANBP2, and PROGRESS.
- Review of evidence from the Perindopril Protection against Recurrent Stroke Study (POISE).
- Examination of data from the Acute Candesartan Cilexetil Evaluation in Stroke Survivors (ACESS) trial.
Main Results:
- Blood pressure lowering protects against stroke irrespective of baseline blood pressure levels, supported by multiple large-scale trials.
- Angiotensin system blockade may offer additional protective benefits for stroke prevention.
- Perindopril-based therapy demonstrates efficacy in reducing stroke events for secondary prevention in both hypertensive and normotensive individuals.
- Evidence for blood pressure management in acute stroke is uncertain, though some trials suggest potential benefits.
Conclusions:
- Blood pressure lowering is recommended for primary stroke prevention using diverse therapeutic agents.
- Perindopril-based therapy is indicated for secondary stroke prevention based on current evidence.
- Further research is needed to clarify the safety and efficacy of blood pressure lowering in acute stroke.
Purpose Of Review:
Elevated blood pressure is one of the most potent risk factors for first ever and recurrent stroke as well as influencing early outcome after acute stroke. There have been a number of significant randomized controlled trials which may influence management in each of these three categories.
Recent Findings:
For primary prevention, the recent information from the Heart Outcomes Prevention Evaluation, Losartan Intervention for Endpoint Reduction to Hypertension, Study on Cognition and Prognosis in the Elderly and Australian National Blood Pressure Study support the view that blood pressure lowering protects against stroke regardless of baseline blood pressure level. There is some evidence that blockade of the angiotensin system may give additional protection. For secondary prevention, evidence from the Perindopril Protection against Recurrent Stroke Study shows that blood pressure lowering with perindopril based therapy reduces fatal or non-fatal stroke events, again in hypertensive or normotensive individuals. There is uncertainty about blood pressure lowering in acute stroke, although presentation of the recent Acute Candesartan Cilexetil Evaluation in Stroke Survivors trial in which there was significant protection against vascular events using candesartan suggests that further studies should be undertaken.
Summary:
Blood pressure lowering for primary prevention of stroke should be undertaken using a variety of therapeutic agents. For secondary stroke prevention perindopril based therapy should be used based on current evidence. Uncertainty still exists as to whether blood pressure lowering in the acute stroke setting is safe or improves outcomes.
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