Low diastolic blood pressure
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Low Diastolic Blood Pressure and Cardiovascular Risk
Increased Risk of Cardiovascular Events and Mortality
Multiple studies show that low diastolic blood pressure (DBP), especially below 70 mmHg and more so below 60 mmHg, is linked to a higher risk of major adverse cardiovascular events (MACE), myocardial infarction (MI), and all-cause mortality. This risk is particularly strong in people with pre-existing cardiovascular disease or heart failure with preserved ejection fraction (HFpEF) Franklin2015Usman2023Siddiqi2023+3 MORE. In older women, both low and high DBP are associated with increased mortality, with the lowest risk seen at DBP levels between 68 and 75 mmHg .
Low DBP in Special Populations
- Heart Failure with Preserved Ejection Fraction (HFpEF): Patients with HFpEF and DBP below 70 mmHg have a higher risk of death, MI, and hospitalization for heart failure, even when systolic blood pressure (SBP) is well controlled .
- Diabetes and High Cardiovascular Risk: In patients with type 2 diabetes and high cardiovascular risk, low DBP is associated with subclinical myocardial injury and increased risk of MI, even after adjusting for other health conditions .
- Chronic Coronary Artery Disease (CAD): Among patients with CAD, lower DBP is linked to more frequent angina and a higher risk of MI, suggesting that aggressive lowering of blood pressure may not be suitable for all patients .
The J-Curve Phenomenon and Pulse Pressure
Several studies describe a J-shaped relationship between DBP and cardiovascular outcomes, where both very low and very high DBP increase risk, and the lowest risk is at moderate DBP levels (around 70–80 mmHg) Franklin2015Usman2023Siddiqi2023+2 MORE. Wide pulse pressure (the difference between SBP and DBP) further increases risk when DBP is low, especially in older adults with isolated systolic hypertension .
Intensive Systolic Blood Pressure Lowering: Is Low DBP a Concern?
While intensive lowering of SBP can reduce cardiovascular risk, it often leads to lower DBP as well. Some analyses suggest that the increased risk seen with low DBP may be due to other factors like older age or existing cardiovascular disease, rather than low DBP itself Siński2019Sobieraj2019. However, other studies indicate that excessively low DBP can blunt the benefits of SBP reduction, especially when DBP falls below 55–60 mmHg Siński2019Chang2024.
Clinical Implications
- Target DBP Range: Most evidence suggests that maintaining DBP between 68 and 80 mmHg is associated with the lowest risk of adverse outcomes, especially in older adults and those with cardiovascular disease Franklin2015Usman2023Siddiqi2023+2 MORE.
- Individualized Treatment: Clinicians should be cautious about aggressive blood pressure lowering in patients with established cardiovascular disease, diabetes, or heart failure, as very low DBP may increase the risk of MI, angina, and death Tsujimoto2018Bergmark2018Peri-Okonny2018.
- Risk Marker: Low DBP may serve as a marker of higher risk, especially in older adults and those with comorbidities, and should prompt careful evaluation rather than automatic intensification of antihypertensive therapy .
Conclusion
Low diastolic blood pressure, particularly below 70 mmHg and especially below 60 mmHg, is associated with increased risk of cardiovascular events and mortality, especially in patients with pre-existing cardiovascular conditions, diabetes, or heart failure. The optimal DBP range for most adults appears to be between 68 and 80 mmHg. Blood pressure management should be individualized, balancing the benefits of lowering systolic blood pressure with the potential risks of excessively low diastolic pressure.
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