Coronary microcirculatory vasodilator function in relation to risk factors among patients without obstructive...

Area of Science:

• Cardiology
• Vascular Biology
• Preventive Cardiology

Background:

• Coronary microcirculatory function is crucial for myocardial perfusion.
• Early coronary atherosclerosis may present without significant epicardial narrowing.
• The relationship between traditional cardiovascular risk factors and microvascular function needs further elucidation.

Purpose of the Study:

• To investigate the association between the Framingham Risk Score (FRS) and coronary microcirculatory vasodilator function.
• To determine if FRS and coronary risk factors predict impaired coronary endothelial and microvascular function in patients with early coronary atherosclerosis.

Main Methods:

• Invasive assessment of coronary endothelial function in 1063 patients without obstructive coronary disease.
• Evaluation of coronary blood flow (CBF) using acetylcholine (endothelium-dependent) and coronary flow reserve (CFR) using adenosine (endothelium-independent).
• Analysis of CBF and CFR in relation to FRS and various cardiovascular risk factors.

Main Results:

• Higher FRS was associated with reduced CBF in men and was a univariate predictor of lower CFR in all patients.
• Multivariable analysis identified higher FRS, female sex, and family history of coronary disease as independent predictors of reduced CFR.
• Impaired microcirculatory vasodilator function was observed even in patients with low to intermediate FRS.

Conclusions:

• In patients without obstructive coronary disease, a higher FRS independently predicts reduced coronary flow reserve (CFR).
• The study demonstrates a link between cardiovascular risk profile and coronary microcirculatory function.
• Impaired microcirculatory vasodilator function may be present early in atherosclerosis, irrespective of epicardial stenosis severity.