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The sympathetic system and hypertension.

M Esler1

  • 1Baker Medical Research Institute, Prahran, Melbourne, Australia. esler@baker.edu.au

American Journal of Hypertension
|August 2, 2000
PubMed
Summary

Sympathetic nervous system overactivity contributes to essential hypertension in both lean and obese individuals. This activation increases cardiovascular risks and can be targeted by medications like rilmenidine for blood pressure control.

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Area of Science:

  • Cardiovascular Medicine
  • Neuroendocrinology
  • Hypertension Research

Background:

  • Sympathetic nervous system (SNS) activation is implicated in essential hypertension.
  • Understanding SNS role in obesity-related hypertension is complex.
  • SNS dysfunction contributes to cardiovascular complications.

Purpose of the Study:

  • To investigate regional sympathetic activity in lean essential hypertension.
  • To elucidate the neural pathophysiology of obesity-related hypertension.
  • To explore the cardiovascular risks associated with sympathetic activation.

Main Methods:

  • Electrophysiologic techniques (sympathetic nerve recording).
  • Neurochemical methods (norepinephrine spillover measurement).
  • Comparison of sympathetic activity in lean, obese, and healthy individuals.

Main Results:

  • Lean hypertensive patients show increased sympathetic outflow to heart, kidneys, and skeletal muscle.
  • Obesity-related hypertension involves elevated renal sympathetic activity without cardiac sympathetic suppression.
  • Sympathetic activation is linked to left ventricular hypertrophy, arrhythmias, insulin resistance, and hyperinsulinemia.

Conclusions:

  • SNS is a key factor in essential hypertension genesis and complications.
  • Increased renal sympathetic activity may predispose to hypertension in obesity.
  • Absence of cardiac sympathetic suppression differentiates obese individuals who develop hypertension.
  • I1 agents like rilmenidine can reduce sympathetic activity and blood pressure, offering cardiovascular protection.

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