Key result
High-normal BP linked to ~28% higher cardiovascular mortality risk versus optimal BP.
Why the study?
High-quality evidence from large population cohorts regarding the relationship between high-normal blood pressure and mortality was lacking.
Does high-normal blood pressure increase the risk of all-cause and cardiovascular mortality in Chinese adults?
Cohort (n=3,598,940)
Yes
Does high-normal blood pressure increase the risk of all-cause and cardiovascular mortality in Chinese adults?
Effect estimate: HR 1.04 (95% CI 1.01-1.07)
Absolute Event Rate: 1.9% vs 1.3%
High-normal blood pressure, particularly when increasing over time, is associated with significantly elevated risks of all-cause and cardiovascular mortality, especially hemorrhagic stroke, in the Chinese population.
Should not yet change practice for high-normal BP; extends observational mortality associations in Chinese adults.
BACKGROUND: The relationship between high-normal blood pressure (BP) and mortality lacks high-quality evidence based on large population cohorts. This study aims to comprehensively investigate the association of high-normal BP and its trajectory with all-cause and cause-specific mortality. METHODS: In this community-based population cohort from the China Health Evaluation And risk Reduction Through nationwide teamwork (ChinaHEART) project, 3,598,940 participants aged 35-75 years with data for baseline BP were included. High-normal BP was defined as a systolic BP (SBP) of 130-139 mmHg and/or a diastolic BP (DBP) of 85-89 mmHg at baseline. Overall, 78,130 participants with three or more BP measurements were included in the trajectory pattern analysis during the follow-up. Four BP change trajectory patterns were identified. RESULTS: For the baseline BP analysis, compared with the optimal BP group (SBP < 120 mmHg and DBP < 80 mmHg [18.1%]), participants with high-normal BP (18.7%) had an increase of 4% in all-cause mortality risk (hazard ratio [HR] 1.04, 95% confidence interval [CI] 1.01-1.07) and an increase of 28% in cardiovascular disease (CVD) mortality risk (HR 1.28, 95% CI 1.21-1.34), with the greatest increase in mortality risk observed for hemorrhagic stroke (HR 1.75, 95% CI 1.55-1.98). Among the BP trajectory patterns, compared with participants with optimal-stable BP, those with high-normal-increasing BP had an increase of 35% in all-cause mortality risk (HR 1.35, 95% CI 1.07-1.70) and an increase in CVD mortality risk of 57% (HR 1.57, 95% CI 1.11-2.24), with the greatest increase in mortality risk also observed for hemorrhagic stroke (HR 3.75, 95% CI 1.50-9.34). Approximately 0.7% and 1.6% of all-cause mortality was attributable to high-normal BP at baseline and the high-normal-increasing BP trajectory pattern, respectively. CONCLUSIONS: Individuals with high-normal BP at baseline exhibited a significantly elevated mortality risk and especially for risk of hemorrhagic stroke mortality during the follow-up. This positive association may be mainly attributed to the "high-normal-increasing" BP change over time.
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Li et al. (2025) conducted a cohort in High-normal blood pressure (n=3,598,940). High-normal blood pressure (SBP 130-139 mmHg and/or DBP 85-89 mmHg) vs. Optimal blood pressure (SBP < 120 mmHg and DBP < 80 mmHg) was evaluated on All-cause mortality (HR 1.04, 95% CI 1.01-1.07). High-normal blood pressure at baseline was associated with a 4% increase in all-cause mortality risk (HR 1.04) and a 28% increase in cardiovascular disease mortality risk compared to optimal blood pressure.
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