Endothelium-dependent and -independent functions are impaired in patients with coronary heart disease

Area of Science:

• Cardiovascular Medicine
• Vascular Biology
• Diagnostic Ultrasound

Background:

• Endothelial dysfunction is a key factor in atherosclerosis and acute coronary events.
• Non-invasive ultrasound methods can detect endothelial dysfunction in patients with cardiovascular risk factors.
• Previous studies identified risk factors like hypertension, diabetes, hypercholesterolemia, and smoking associated with endothelial dysfunction.

Purpose of the Study:

• To investigate endothelial function in patients with coronary heart disease (CHD) using high-resolution ultrasound.
• To compare endothelial function between CHD patients and healthy controls.
• To explore the relationship between endothelial function and serum lipid levels, specifically HDL-C.

Main Methods:

• Employed high-resolution ultrasound to assess brachial artery endothelial function.
• Measured endothelium-dependent vasodilation (Flow-Mediated Dilation, FMD).
• Measured endothelium-independent vasodilation using nitroglycerine administration.

Main Results:

• Patients with CHD exhibited significantly impaired endothelium-dependent (2.61% vs. 8.10%) and endothelium-independent (17.20% vs. 23.19%) vasodilation compared to controls (P<0.001).
• Flow-mediated dilation (FMD) showed a significant positive correlation with nitroglycerine-induced dilation (P<0.001).
• Both univariate and multivariate analyses revealed a significant correlation between FMD extent and serum HDL-C levels (P<0.01).

Conclusions:

• Coronary heart disease is associated with impaired endothelial and smooth muscle function.
• Reduced high-density lipoprotein cholesterol (HDL-C) levels may be a contributing factor to endothelial dysfunction in CHD patients.
• Ultrasound assessment of brachial artery function provides valuable insights into cardiovascular health.