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Lessons from human coronary aspirate
Petra Kleinbongard1, Thomas Konorza, Dirk Böse
1Institut für Pathophysiologie, Universitätsklinikum Essen, Germany.
Insights
Stent implantation during coronary artery procedures allows analysis of plaque debris and soluble substances. This analysis enhances understanding of vulnerable plaque and microvascular events like no-reflow.
Area of Science:
- Cardiovascular Medicine
- Interventional Cardiology
- Pathophysiology
Background:
- Stent implantation in atherosclerotic coronary arteries models human plaque rupture.
- Protection devices enable retrieval of embolic material and soluble substances.
- Coronary microembolization can cause no-reflow phenomenon.
Purpose of the Study:
- To analyze particulate debris and soluble substances from coronary plaque rupture during stenting.
- To correlate findings with clinical symptoms, stenosis, and plaque burden.
- To understand the pathophysiology of vulnerable atherosclerotic plaque.
Main Methods:
- Interventional stent implantation with protection devices.
- Ex vivo analysis of retrieved particulate debris (cholesterol crystals, foam cells, calcium, platelets, coagulation material).
- Analysis of soluble substances (serotonin, thromboxane, TNFα) using bioassays and intravascular ultrasound.
Main Results:
- Particulate debris includes atheroma components and thrombotic material.
- Soluble substances include vasoconstrictors and inflammatory mediators like TNFα.
- Vasoconstriction ex vivo correlates with clinical symptoms, stenosis, and plaque burden.
- TNFα release correlates with restenosis.
Conclusions:
- Analysis of coronary aspirate provides insights into vulnerable plaque pathophysiology.
- Understanding these mechanisms can help antagonize microvascular consequences of coronary microembolization.
- This research contributes to understanding coronary blood flow dynamics.
Abstract:
The interventional implantation of a stent into an atherosclerotic coronary artery is a unique and paradigmatic scenario of plaque rupture in humans. The use of protection devices not only prevents the released plaque particles and the superimposed thrombotic material from being washed and embolized into the coronary microcirculation of the individual patient, but permits also the retrieval and ex vivo analysis of particulate plaque debris and soluble substances. The particulate debris comprises typical cholesterol crystals, foam cells, hyalin material and calcium deposits from the atheroma as well as platelets and coagulation material; soluble substances include vasoconstrictors, such as serotonin and thromboxane, as well as inflammatory mediators, such as TNFα which amplifies vasoconstriction by inducing endothelial dysfunction. The vasoconstriction observed in a bioassay ex vivo correlates to clinical symptoms, angiographic stenosis and plaque burden, as assessed by intravascular ultrasound. The release of TNFα into the aspirate correlates to restenosis. Detailed analysis of the human coronary aspirate may promote a better understanding of the pathophysiology of the vulnerable atherosclerotic plaque and help to better antagonize the microvascular consequences of coronary microembolization, including the no reflow phenomenon. This article is part of a Special Issue entitled "Coronary Blood Flow."
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