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Updated: Jun 23, 2026

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Published on: August 18, 2015
The relation of blood pressure to stroke prognosis
Insights
High systolic blood pressure and significant increases in systolic blood pressure over 5 years before a stroke predict a worse prognosis. This finding is crucial for stroke survival prediction.
Area of Science:
- Neurology
- Cardiology
- Epidemiology
Background:
- Stroke remains a leading cause of mortality and disability worldwide.
- Predictive factors for post-stroke survival are essential for clinical management.
- Previous blood pressure readings may offer insights into stroke outcomes.
Purpose of the Study:
- To investigate the association between pre-stroke blood pressure and survival.
- To determine if blood pressure changes over time impact stroke prognosis.
Main Methods:
- Analysis of the Manitoba study cohort (3983 men).
- Utilized last recorded blood pressure before stroke and 5-year change in blood pressure.
- Multivariate analysis adjusted for age at stroke and ischemic heart disease.
Main Results:
- Elevated systolic blood pressure and its 5-year increase were linked to poorer prognosis.
- Systolic blood pressure and its 5-year change significantly predicted 30-day mortality.
- Systolic blood pressure was a stronger predictor of short-term mortality than diastolic pressure.
Conclusions:
- Pre-stroke high systolic blood pressure is a significant predictor of poor short-term survival.
- A substantial 5-year increase in systolic blood pressure before stroke indicates a worse prognosis.
- Systolic blood pressure is a key factor in predicting short-term mortality after stroke.
Abstract:
The relation between blood pressure before stroke and survival after the event, was examined in the Manitoba study cohort of 3983 men. The last recorded blood pressure before the first stroke and the change in blood pressure from a measurement 5 years earlier were used. Increasing magnitude of systolic blood pressure and its 5-year changes were associated with worsening prognosis. The same association was less apparent for diastolic blood pressure and was not found for 5-year change in diastolic pressure. After adjusting for the effect of age at stroke and previous evidence of ischemic heart disease in multivariate analysis, systolic blood pressure and its 5-year change were each significant predictors of short-term (30 days) mortality. Considering all these factors as well as diastolic blood pressure, systolic blood pressure was the best predictor of short-term mortality. Thus, high blood pressure and large positive 5-year change in systolic blood pressure before stroke occurrence are significant predictors of a poor prognosis.
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