Endothelial dysfunction in human hand veins is rapidly reversible after smoking cessation

Area of Science:

• Vascular Biology
• Cardiovascular Physiology
• Endothelial Function

Background:

• Cigarette smoking is known to impair arterial endothelium-dependent dilation.
• The impact of smoking on venous endothelium-dependent vasodilation remains less understood.
• Understanding these vascular effects is crucial for cardiovascular health.

Purpose of the Study:

• To investigate whether cigarette smoking impairs endothelium-dependent venodilation.
• To assess the reversibility of smoking-induced endothelial dysfunction after cessation.
• To evaluate a human vein model for studying vascular functional alterations.

Main Methods:

• Utilized the dorsal hand vein technique to assess venodilation.
• Constructed dose-response curves using bradykinin (endothelium-dependent) and nitroglycerin (endothelium-independent) in smokers and nonsmokers.
• Administered L-arginine to smokers to evaluate its effect on venodilation.

Main Results:

• Smokers exhibited significantly impaired bradykinin-induced venodilation compared to controls (61% vs. 89%).
• No difference in nitroglycerin-induced venodilation was observed between groups, indicating specific endothelial impairment.
• Coinfusion with L-arginine markedly improved venodilation in smokers.
• Endothelium-dependent venodilation returned to normal levels within 24 hours of smoking cessation.

Conclusions:

• Cigarette smoking impairs endothelium-dependent venodilation in heavy smokers.
• This endothelial dysfunction is rapidly reversible following smoking cessation.
• The dorsal hand vein model is a valuable tool for studying endothelial dysfunction and potential interventions.