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Influence of a Decrease in Blood Viscosity on Arterial Pressure in Normotensive and Spontaneously Hypertensive Rats.

A V Sidekhmenova1, O I Aliev2, A M Anishchenko2,3

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Decreasing blood viscosity significantly lowered blood pressure in hypertensive rats, unlike normotensive rats, indicating impaired blood pressure regulation and endothelial dysfunction in hypertension.

Keywords:
arterial hypertensionblood viscosityendothelial dysfunctionnormotensive ratsspontaneously hypertensive rats

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Area of Science:

  • Physiology
  • Cardiovascular Research
  • Hypertension Studies

Background:

  • Blood viscosity plays a role in blood pressure regulation.
  • Endothelial dysfunction is a hallmark of hypertension.
  • The impact of reduced blood viscosity on blood pressure in hypertensive models requires further elucidation.

Purpose of the Study:

  • To investigate the effect of decreased blood viscosity on mean blood pressure (BP) and endothelial vasodilating activity.
  • To compare these effects in normotensive Wistar rats and spontaneously hypertensive rats (SHR).

Main Methods:

  • Isovolumic hemodilution was used to reduce blood viscosity by 16% in both rat groups.
  • Mean blood pressure was monitored before and after hemodilution.
  • Endothelial vasodilating activity was assessed using acetylcholine administration in SHR.

Main Results:

  • In Wistar rats, reduced blood viscosity did not significantly alter mean BP.
  • In SHR, reduced blood viscosity led to an 18% decrease in mean BP, with significant correlations observed.
  • SHR exhibited decreased endothelial vasodilating activity, suggesting impaired BP regulation in response to shear stress changes.

Conclusions:

  • Hypertensive rats demonstrate impaired blood pressure regulation, with BP passively following changes in blood viscosity.
  • Endothelial dysfunction in SHR contributes to the inability to adequately respond to altered shear stress.
  • These findings highlight the critical role of endothelial function in maintaining blood pressure homeostasis in hypertension.