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Blood pressure levels and stroke: J-curve phenomenon?
Jolanta Malyszko1, Paul Muntner, Jacek Rysz
12nd Department of Nephrology and Hypertension with Dialysis Unit, Medical University, Bialystok, Poland.
Insights
The blood pressure J-curve relationship is well-established for general and high-risk patients. However, more research is needed to clarify its impact on stroke prevention, where lower blood pressure may be more beneficial.
Area of Science:
- Cardiology
- Neurology
- Hypertension Research
Background:
- The J-curve phenomenon in blood pressure management has been debated for over 30 years.
- Existing studies suggest a J-curve relationship between blood pressure and outcomes in general and high-risk hypertensive populations.
- Limited data exists on the specific relationship between blood pressure and stroke prevention.
Purpose of the Study:
- To review the evidence for the blood pressure J-curve in various patient groups.
- To highlight the knowledge gap concerning the J-curve effect on stroke prevention.
- To emphasize the need for further research in this area.
Main Methods:
- Review of existing antihypertensive therapy studies.
- Analysis of observational data on blood pressure and outcomes.
- Evaluation of randomized trials concerning blood pressure and stroke prevention.
Main Results:
- Strong evidence supports a J-curve relationship for blood pressure and primary outcomes in diverse hypertensive populations.
- Data on the blood pressure J-curve and stroke prevention is limited.
- Observational studies suggest a potential "lower is better" approach for stroke prevention, but require confirmation.
Conclusions:
- The J-curve phenomenon is well-documented for cardiovascular outcomes in hypertension.
- The relationship between blood pressure and stroke prevention remains unclear, with a potential inverse correlation.
- Further large-scale, randomized trials are essential to definitively establish the optimal blood pressure targets for stroke prevention.
Abstract:
The blood pressure J-curve discussion has been ongoing for more than 30 years, yet there are still questions in need of definitive answers. On one hand, existing antihypertensive therapy studies provide strong evidence for J-curve-shaped relationships between both diastolic and systolic blood pressure and primary outcomes in the general hypertensive patient population, as well as in high-risk populations, including subjects with coronary artery disease, diabetes mellitus, left ventricular hypertrophy, and the elderly. On the other hand, we have very limited data on the relationship between systolic and diastolic blood pressure and stroke prevention. Moreover, it seems that this outcome is more a case of "the lower the better." Further large, well-designed studies are necessary in order to clarify this issue, especially as existing available studies are observational, and randomized trials either did not have or lost statistical power and were thus inconclusive.
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Monitoring Both Arms:
Monitoring BP in both arms during the initial assessment is advisable, as the systolic value may differ by five to ten mm Hg between arms. For subsequent BP assessments, use the arm with the higher reading.