The present study evaluates skin microvascular reactivity and coronary physiology in the same coronary artery disease (CAD) patients. This study is expected to find associations between systemic microvascular reactivity, measured non-invasively at the skin surface, and coronary reserve evaluated by the invasive angiographic method.
Introduction: Microvascular reactivity (MR) evaluated in the skin has been proposed as representative of systemic endothelial function, including coronary circulation. There is a lack of studies investigating the association between skin MR and invasive evaluation of coronary reserve. Objective: To evaluate skin MR and coronary physiology in the same coronary artery disease (CAD) patients. Methods: Transversal study, recruiting adult patients with indication for elective coronary angiographic study for the evaluation of CAD by an independent medical team. The evaluation of microvascular cutaneous blood flow of the forearm will use laser speckle contrast imaging (LSCI) coupled with acetylcholine iontophoresis. Coronary physiology will be evaluated in the same patients and in the same day with coronary angiography with lesion assessment by fractional flow reserve (FFR, after intracoronary adenosine administration) and contrast fractional flow reserve (cFFR, after intracoronary contrast media administration), with measurements of hyperemic intravascular pressures. FFR and cFFR will be performed in vessels with intermediate lesions, as evaluated in quantitative angiography. Expected results: This study is expected to find associations between systemic MR, measured non-invasively at the skin surface, and coronary reserve evaluated by the invasive angiographic method.
Study Type
INTERVENTIONAL
Allocation
NA
Purpose
DIAGNOSTIC
Masking
NONE
Enrollment
50
Hemodynamic invasive study employing FFR (after intracoronary adenosine administration) and cFFR (after intracoronary lopamidol contrast media administration) measurements of hyperemic intravascular pressure.
National Institute of Cardiology
Rio de Janeiro, Brazil
Assessment by fractional flow reserve (FFR) and contrast fractional flow reserve (cFFR).
Physiological coronary artery obstruction assessment through FFR and cFFR. For FFR and cFFR measurement, a 0.014FR guidewire will be advanced distal to the lesion, with baseline and hyperemic (after adenosine or contrast administration) vascular pressure measurements, with two-minute interval between each measurement.
Time frame: day 1 visit to the hemodynamic laboratory
Systemic microvascular reactivity
Laser-based method for evaluating non-invasive, operator-independent systemic microvascular function that detects microvascular flow in the skin for the evaluation of systemic vascular endothelial function.
Time frame: day 1 visit to the hemodynamic laboratory
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