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Carotid sinus stimulation responses are related with arterial elastic properties in hypertensive subjects

Costas Tsioufis1, Costas Thomopoulos, Taxiarchou Efstathios

  • 1Department of Cardiology, University of Athens, Hippokration Hospital, Athens, Greece. tsioufis@otenet.gr

American Journal of Hypertension
|October 24, 2003
PubMed

Insights

Early hypertension reduces common carotid artery distensibility, leading to exaggerated carotid sinus stimulation responses. This arterial stiffening is a key factor in altered cardiovascular reflexes in newly diagnosed hypertensive patients.

Area of Science:

  • Cardiovascular Physiology
  • Vascular Biology
  • Hypertension Research

Background:

  • Exaggerated carotid sinus stimulation (CSStim) responses are linked to aging, hypertension, and atherosclerosis.
  • Limited data exists on arterial function's role in CSStim responses during early hypertension.

Purpose of the Study:

  • To investigate the relationship between common carotid artery (CCA) distensibility and CSStim responses in newly diagnosed essential hypertension.
  • To determine if arterial functional status contributes to CSStim responses in early hypertensive disease.

Main Methods:

  • Carotid sinus stimulation (CSStim) with ECG and brachial artery blood pressure (BP) monitoring in 90 hypertensive patients and 75 controls.
  • Evaluation of cardioinhibitory CSStim response using an index (longest R-R interval during stimulation/R-R interval at rest).
  • Measurement of CCA distensibility via echocardiography and sphygmomanometry.

Main Results:

  • Hypertensive patients exhibited significantly decreased CCA distensibility compared to normotensive controls.
  • Hypertensive subjects showed a significantly increased CSStim response index.
  • CCA distensibility, but not age or pulse pressure, was a significant determinant of CSStim response index in a multivariate model.

Conclusions:

  • Hypertension-induced changes in CCA elastic properties are associated with altered CSStim responses.
  • These findings suggest a link between arterial stiffness and cardiovascular reflex alterations in early hypertension.
  • Understanding these mechanisms may elucidate the connection between atherosclerosis and CSStim responses.
Abstract

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