Prognostic value of brachial artery endothelial function and wall thickness

Area of Science:

• Vascular biology and cardiovascular diagnostics.
• Non-invasive assessment of atherosclerosis.

Background:

• Brachial artery (BA) flow-mediated vasodilation (FMD) and intima-media thickness (IMT) are linked to coronary artery disease (CAD) risk factors and presence.
• Previous studies on the prognostic significance of BA-FMD have yielded conflicting results.

Purpose of the Study:

• To evaluate the prognostic capability of BA-FMD and IMT in patients undergoing invasive assessment for chest pain.
• To determine if these vascular markers predict future cardiovascular events.

Main Methods:

• High-resolution ultrasound was used to measure BA-FMD and IMT in 398 consecutive patients prior to coronary angiography.
• Patients were stratified based on the median BA-FMD value.
• Cardiovascular events were tracked over a mean follow-up period of 39 months.

Main Results:

• No significant difference in cardiovascular events was observed between groups stratified by BA-FMD.
• Multivariate Cox regression analysis identified the presence of CAD and IMT as significant predictors of cardiovascular events.
• BA diameter, age, number of risk factors, and BA-FMD were not independently associated with cardiovascular events in the long term.

Conclusions:

• Intima-media thickness (IMT) of the brachial artery is a valuable predictor of late cardiovascular events (up to 4 years) in patients evaluated for chest pain.
• A single baseline measurement of brachial artery flow-mediated vasodilation (BA-FMD) appears to have limited long-term prognostic utility.
• IMT may be a more reliable marker for risk stratification in this patient cohort.