Mortality risk of high blood pressure
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High Blood Pressure and All-Cause Mortality Risk
Multiple large-scale studies show that high blood pressure (BP), even at the high-normal range (systolic BP 130–139 mmHg and/or diastolic BP 85–89 mmHg), is linked to an increased risk of all-cause mortality compared to optimal BP levels. The risk is especially pronounced when high-normal BP increases over time, with some studies reporting up to a 25–35% higher risk of death for those whose BP rises from high-normal to hypertensive levels during follow-up Li2024Li2025. However, some analyses suggest that when using certain guideline definitions, high-normal BP may not significantly differ in mortality risk from normal BP, highlighting the importance of how BP categories are defined .
High Blood Pressure and Cardiovascular Disease (CVD) Mortality
High blood pressure is a strong and consistent risk factor for cardiovascular mortality. Individuals with high-normal BP have a 28% higher risk of dying from CVD compared to those with optimal BP, with the greatest risk seen for hemorrhagic stroke (up to 75% higher) Li2024Li2025. When BP increases from high-normal to hypertensive levels, the risk of CVD mortality can rise by 57–67%, and the risk of death from hemorrhagic stroke can more than triple Li2024Li2025. Studies in the U.S. and other populations confirm that both hypertension and high-normal BP (especially at the upper end of the range) are associated with increased CVD mortality, particularly in younger adults and certain ethnic groups Gu2008Hidalgo-Benites2021Stamler1991.
Blood Pressure Trajectories and Long-Term Risk
The pattern of BP change over time is important. People whose BP starts in the high-normal range and increases further have a much higher risk of both all-cause and CVD mortality than those whose BP remains stable and optimal Li2024Li2025. Early-life BP measurements are better predictors of future cardiovascular death than measurements taken later in life, emphasizing the importance of early detection and management .
Blood Pressure Lowering and Mortality Reduction
Lowering BP in people with hypertension (systolic BP ≥140 mmHg) is clearly associated with reduced risk of death and major cardiovascular events. However, in people with baseline systolic BP below 140 mmHg, BP-lowering treatment does not show a significant benefit for reducing mortality in primary prevention, though it may help those with existing heart disease .
High Blood Pressure in the Context of Metabolic Syndrome
When high blood pressure is combined with other metabolic risk factors, such as elevated fasting plasma glucose, the risk of death from all causes, cancer, and CVD is even higher. Individuals with both elevated BP and glucose have up to a 44% higher risk of all-cause mortality and a 34% higher risk of CVD mortality compared to those without these risk factors .
Population-Wide Impact and Prevention
The risk associated with high blood pressure is continuous and graded, affecting not just those with clinical hypertension but also those with high-normal BP. This means that even modest increases in BP above optimal levels can raise the risk of death and cardiovascular events, making population-wide prevention strategies—such as lifestyle changes—crucial .
Conclusion
High blood pressure, including high-normal levels, is a significant risk factor for both all-cause and cardiovascular mortality. The risk increases further when BP rises over time or is combined with other metabolic abnormalities. Early detection, lifestyle modification, and appropriate management are key to reducing the mortality risk associated with elevated blood pressure.
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