Delayed flow-mediated vasodilation and critical coronary stenosis.

Area of Science:

• Cardiovascular Medicine
• Vascular Biology
• Diagnostic Imaging

Background:

• Endothelial dysfunction, arterial wall thickening, and plaque formation are key indicators of atherosclerosis.
• Impaired brachial artery dilation post-ischemia correlates with the severity of both extracoronary and coronary atherosclerosis.

Purpose of the Study:

• To determine if delayed or absent brachial artery dilation is associated with critical coronary stenosis.
• To investigate the relationship between coronary stenosis, carotid artery wall thickness, and peripheral artery disease.

Main Methods:

• Endothelial function assessed via brachial artery flow-mediated dilation (FMD) over 3 minutes post-ischemia, categorizing patients as early, late, or non-dilators.
• Coronary angiography utilized for stenosis assessment; computerized quantitative angiography and Gensini score quantified coronary atherosclerosis severity.
• Carotid artery wall thickness, plaque, and peripheral artery disease evaluated using ultrasound.

Main Results:

• Patients with critical coronary stenosis (≥70%) exhibited a higher incidence of delayed (50%) or absent (35%) dilation compared to those with less severe stenosis.
• The Gensini score, a measure of coronary atherosclerosis severity, was significantly higher in late (17.5±27.1) and non-dilators (39.7±55.0) versus early dilators (4.5±13.5) (P<0.02).
• Carotid atherosclerosis and peripheral artery disease were more common in patients with critical coronary stenosis.

Conclusions:

• Delayed or absent brachial artery dilation is linked to the presence and severity of coronary stenosis and atherosclerosis.
• The speed and pattern of arterial dilation, not just the magnitude, appear significant in evaluating coronary artery disease and overall cardiovascular risk.