Evaluation of human coronary vasodilator function predicts future coronary atheroma progression

Area of Science:

• Cardiovascular Medicine
• Medical Imaging
• Atherosclerosis Research

Background:

• Coronary vasodilator dysfunction and atherosclerotic plaque progression are linked to adverse cardiovascular events.
• The interplay between coronary vasodilator function, plaque lipid burden, and progression remains unclear.

Purpose of the Study:

• To investigate the relationship between impaired coronary vasodilator function (endothelial-dependent and independent) and the progression of coronary atheroma plaque lipid burden.
• To assess how baseline vasodilator function influences changes in plaque composition over time.

Main Methods:

• Serial assessment of coronary vasodilator function and intracoronary plaque imaging using intravascular ultrasound (IVUS) and near-infrared spectroscopy (NIRS) in 33 patients.
• Measurement of coronary segmental macrovascular response, plaque burden (PAV), and lipid core burden (LCBI) at baseline and 12-18 months.
• Analysis of lipid-negative segments that developed lipid-rich plaque (LRP) over the study period.

Main Results:

• Segments developing LRP showed impaired endothelial-dependent and independent function at baseline.
• Endothelial-dependent function predicted changes in lipid core burden index (∆LCBI).
• Endothelial-independent function predicted changes in plaque burden (∆PAV).

Conclusions:

• Epicardial coronary vasodilator function is a key determinant of future atheroma progression and plaque composition.
• These findings are relevant irrespective of the patient's clinical presentation (stable chest pain or acute coronary syndrome).
• Dual modality imaging (IVUS and NIRS) provides valuable insights into plaque dynamics and vasodilator function.