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Related Experiment Videos

Direct effect of ethanol on human vascular function.

Ahmed Tawakol1, Torbjørn Omland, Mark A Creager

  • 1Cardiac Unit, Department of Medicine, Massachusetts General Hospital, Boston, MA 02114, USA.

American Journal of Physiology. Heart and Circulatory Physiology
|February 7, 2004
PubMed
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Moderate ethanol consumption has complex vascular effects. While it initially constricts blood vessels, it enhances vasodilation, but not through increased nitric oxide, challenging prior research.

Area of Science:

  • Cardiovascular Physiology
  • Vascular Biology
  • Pharmacology

Background:

  • Epidemiological studies suggest moderate ethanol intake reduces cardiovascular mortality.
  • Preclinical data indicate ethanol benefits the vascular endothelium and increases nitric oxide bioavailability.

Purpose of the Study:

  • To investigate the impact of ethanol on endothelium-dependent and nitric oxide-mediated vasodilation in healthy humans.

Main Methods:

  • Forearm blood flow (FBF) was measured using venous occlusion plethysmography.
  • Infusions included methacholine, nitroprusside, verapamil, and ethanol (10% in 5% dextrose).
  • Nitric oxide synthase inhibition was assessed using N(G)-nitro-L-arginine (L-NAME).

Main Results:

Related Experiment Videos

  • Ethanol infusion alone caused initial forearm vasoconstriction.
  • Ethanol augmented FBF responses to methacholine, nitroprusside, and verapamil.
  • L-NAME did not block ethanol's potentiation of verapamil-induced vasodilation.

Conclusions:

  • Ethanol exhibits complex vascular actions, including basal vasoconstriction and potentiation of vasodilation.
  • These effects are not mediated by increased nitric oxide bioavailability, contradicting preclinical findings.