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Clinical implications of pathophysiologic changes in the midlife hypertensive patient
1Department of Internal Medicine, University of Michigan Medical Center, Ann Arbor 48109-0356.
Insights
Aging and hypertension reduce cardiac output and increase vascular resistance. Alpha-adrenergic blockers may benefit middle-aged hypertensive patients by improving lipids and insulin resistance.
Area of Science:
- Cardiovascular Physiology
- Pharmacology
Background:
- Aging and hypertension reduce cardiac output via lower stroke volume and diminished beta-adrenergic responsiveness.
- Vascular resistance increases due to hypertrophy, with enhanced alpha-adrenergic responsiveness in hypertension.
- Both conditions are linked to elevated plasma cholesterol and insulin, especially in middle-aged hypertensive individuals.
Purpose of the Study:
- To evaluate the potential benefits of alpha-adrenergic-blocking agents in middle-aged hypertensive patients.
- To explore the role of alpha-blockers in managing lipid and insulin resistance associated with hypertension and aging.
Main Methods:
- Review of physiological changes in aging and hypertension.
- Analysis of the effects of alpha-adrenergic responsiveness.
- Consideration of the impact of alpha-blockers on lipids and insulin resistance.
Main Results:
- Alpha-adrenergic-blocking agents demonstrate positive effects on lipids and insulin resistance.
- Enhanced alpha-adrenergic responsiveness in hypertension suggests a potential therapeutic target.
- Vasodilators do not diminish exercise performance, supporting the use of alpha-blockers.
Conclusions:
- Alpha-blockers are favored as a first-line treatment for middle-aged hypertensive patients due to their effects on lipids and insulin resistance.
- Blood pressure reduction remains the primary objective, with individual efficacy of alpha-blockers needing confirmation.
Abstract:
Both aging and hypertension decrease cardiac output through a lower stroke volume and a diminished beta-adrenergic responsiveness. In parallel, the vascular resistance increases because of vascular hypertrophy. In addition, in hypertension the alpha-adrenergic responsiveness is enhanced. Aging and hypertension are also associated with an increase in plasma cholesterol and insulin values. These alterations in cholesterol and insulin levels become particularly pronounced in middle-aged patients with hypertension. alpha-Adrenergic-blocking agents have a positive effect on lipids and insulin resistance. The shift toward enhanced alpha-adrenergic responsiveness, and the fact that vasodilators do not diminish exercise performance favor the use of alpha-blockers as a first drug in middle-aged patients with hypertension. Blood pressure lowering still remains the paramount goal, and these compounds should be used only if proved to be efficacious in a given individual patient.