Thromboangiitis obliterans and endothelial function

Area of Science:

• Vascular Biology
• Cardiovascular Physiology
• Rheumatology

Background:

• Endothelial dysfunction is a potential factor in the pathophysiology of thromboangiitis obliterans (TAO).
• This study investigates endothelial function and arterial stiffness in TAO patients during exacerbation.

Purpose of the Study:

• To compare endothelial function and large artery stiffness between TAO patients in exacerbation and healthy controls.
• To elucidate the role of endothelial dysfunction in acute TAO.

Main Methods:

• Assessed flow-mediated vasodilation via gradual hand skin heating and endothelium-independent vasodilation using glyceryl trinitrate (GTN).
• Utilized high-resolution echotracking to measure brachial artery (BA) diameter and wall shear stress.
• Measured aortic stiffness using carotid-to-femoral pulse wave velocity.

Main Results:

• TAO patients had a smaller baseline brachial artery diameter compared to controls (P=0.04).
• No significant difference in flow-mediated dilation was observed between TAO patients and controls.
• TAO patients demonstrated significantly greater endothelium-independent vasodilation after GTN (P=0.02) and increased aortic stiffness (P=0.0052).

Conclusions:

• Acute thromboangiitis obliterans is characterized by vasoconstriction and elevated aortic stiffness.
• Flow-mediated dilation is not altered in the exacerbation phase of TAO, suggesting preserved endothelium-dependent vasodilation.
• Increased arterial stiffness may contribute to the vascular complications observed in TAO.