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How to study coronary microvascular dysfunction and its clinical relevance
Antonio L'Abbate1, Gianmario Sambuceti
1CNR Institute of Clinical Physiology, Scuola Superiore di Studi Universitari S. Anna, Pisa, Italy. segrlabb@ifc.cnr.it
Insights
Acute coronary syndromes can occur without critical blockages, challenging traditional views. Research now explores the coronary microcirculation
Area of Science:
- Cardiology
- Cardiovascular Research
- Pathophysiology
Background:
- Acute coronary syndromes (ACS) and myocardial infarction (MI) often occur in patients without critical coronary artery stenosis.
- This challenges the long-held view of stenosis severity as the primary driver of ischemic heart disease.
- Research is shifting focus beyond plaque burden to other contributing factors.
Purpose of the Study:
- To critically review theoretical and technical approaches for studying coronary microcirculation in ischemic heart disease.
- To highlight the potential role of coronary microcirculation in the pathophysiology of ischemic heart disease.
- To provide insights into the current limitations and future directions in evaluating coronary microcirculation.
Main Methods:
- Review of existing literature on coronary microcirculation and ischemic heart disease.
- Critical analysis of theoretical frameworks and technical methodologies.
- Discussion of experimental models and clinical evaluation challenges.
Main Results:
- Coronary microcirculation is increasingly recognized as a potential cofactor in ischemic heart disease manifestations.
- Current clinical evaluation methods for coronary microcirculation face significant methodological limitations.
- Experimental models for studying coronary atherosclerosis and ischemic heart disease remain inadequate.
Conclusions:
- The precise nature and mechanisms of coronary microcirculation's involvement in ischemic heart disease remain largely speculative.
- Further advancements in theoretical approaches and technical methodologies are crucial for understanding its role.
- This review aims to equip readers with knowledge to better assess the significance of coronary microcirculation in ischemic heart disease.
Abstract:
It is now accepted that the precipitation of acute coronary syndromes and, mostly, of acute myocardial infarction often occurs in patients who do not show critical stenoses. This and other findings challenge the relevance of stenosis severity as a major pathogenetic determinant in ischemic heart disease. Thus, a large amount of research has been put forward to investigate further mechanisms, besides changes in plaque burden and stenosis severity, associated with the precipitation of ischemia. Among putative mechanisms, great attention has been paid in the last decades to the activation of the atherosclerotic plaque and its complications, while only recently the interest has been focused on the potential role of coronary microcirculation as a cofactor in many clinical manifestations of ischemic heart disease. At present, the clinical evaluation of coronary microcirculation is hampered by a number of methodological limitations while the experimental models of coronary atherosclerosis and ischemic heart disease are still far from being satisfactory. As a consequence, although an involvement of the coronary microcirculation has been suspected in a large number of clinical syndromes, its nature and mechanisms still remain largely speculative. The present paper will try to critically review theoretical and technical approaches to the study of coronary microcirculation in ischemic heart disease with the aim at providing the reader with those elements potentially helpful to his own judgment on the matter.