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Measuring hypertensive cardiovascular risk: the vascular overload concept
1Hypertension Center, Veterans Affairs Medical Center, Long Beach, CA 90822.
Insights
Vascular overload, a key indicator of hypertensive cardiovascular risk, is influenced by artery stiffness and pulse wave reflection. New therapeutic strategies should target systolic pressure in younger individuals and pulse pressure in the elderly.
Area of Science:
- Cardiovascular Medicine
- Hypertension Research
- Vascular Physiology
Background:
- Hypertensive cardiovascular risk is multifactorial, involving vascular overload.
- Vascular overload comprises increased arteriolar resistance, large-artery stiffness, and early pulse-wave reflection.
- Artery stiffness and pulse-wave reflection increase with hypertension severity and duration.
Purpose of the Study:
- To explore the relationship between vascular overload and hypertensive cardiovascular risk.
- To identify reliable indicators of vascular overload for risk assessment.
- To propose new therapeutic targets based on vascular overload components.
Main Methods:
- Quantifying vascular overload using mean arterial pressure and pulse pressure measurements.
- Analyzing the contribution of vascular abnormalities to vascular overload over time.
- Evaluating systolic and pulse pressure as surrogates for vascular overload across different age groups.
Main Results:
- Vascular overload is a significant indicator of hypertensive cardiovascular risk.
- Systolic blood pressure effectively surrogates vascular overload in younger hypertensive patients.
- Pulse pressure is a superior surrogate for vascular overload in elderly patients with isolated systolic hypertension.
Conclusions:
- Vascular overload is a crucial determinant of hypertensive cardiovascular risk.
- Therapeutic goals should be tailored: control systolic pressure in the young and pulse pressure in the elderly.
- Diastolic blood pressure alone is less informative for assessing vascular overload and cardiovascular risk.
Abstract:
Hypertensive cardiovascular risk may be related primarily to vascular overload, the sum of three vascular abnormalities: increased arteriolar resistance, increased large-artery stiffness, and the effect of increased early pulse-wave reflection. A method for quantifying vascular overload as an index can be derived from measurements of mean arterial pressure and pulse pressure. Several lines of evidence support the hypothesis that abnormal artery stiffness and early pulse-wave reflection become larger components of vascular overload as the duration and severity of hypertension increase. Moreover, these studies suggest that vascular overload is a true indicator of hypertensive cardiovascular risk. Increased systolic blood pressure is a surrogate for vascular overload in young and middle-aged hypertensive subjects. Increased pulse pressure and decreased diastolic pressure are superior to increased systolic pressure as surrogates for vascular overload in geriatric isolated systolic hypertension. By itself, diastolic blood pressure is difficult to interpret and may be an epiphenomenon. Therefore new therapeutic goals, are control of systolic pressure in the young and of pulse pressure in the elderly.
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