Vulnerable atherosclerotic plaque detection by resonance Raman spectroscopy.

Area of Science:

• Biomedical Optics
• Materials Science
• Cardiovascular Research

Background:

• Atherosclerotic plaques develop through distinct stages, posing risks for cardiovascular events.
• Vulnerable plaques (VPs) are particularly unstable and prone to rupture.
• Accurate characterization of plaque composition and stability is critical for risk stratification.

Purpose of the Study:

• To investigate the utility of resonance Raman (RR) spectroscopy for differentiating atherosclerotic plaque states.
• To establish correlations between RR spectral features and plaque evolution.
• To assess the relationship between RR measurements and fibrous cap thickness in VPs.

Main Methods:

• Resonance Raman (RR) spectroscopy was applied to human aortic plaque samples.
• Analysis focused on molecular fingerprints of lipids, cholesterol, proteins, and other key biomolecules.
• RR spectral data were correlated with histopathological measurements of fibrous cap thickness.

Main Results:

• Distinct RR spectra were observed for fibrolipid, calcified/ossified, and vulnerable atherosclerotic plaques.
• Unique molecular fingerprints were identified for each plaque state.
• A significant correlation was found between RR spectral changes and fibrous cap thinning, particularly around 66 µm, near the threshold for thin cap fibroatheroma.

Conclusions:

• Resonance Raman spectroscopy can effectively differentiate stages of atherosclerotic plaque development.
• RR spectral analysis provides a non-invasive method to assess VP stability by correlating with fibrous cap thickness.
• This technique holds potential for improved diagnosis and management of atherosclerosis.