Advances in Imaging Techniques for Assessing Myocardial Microcirculation in People with Diabetes: An Overview of Current Techniques, Emerging Techniques, and Clinical Applications

Microangiopathy is a key complication of diabetes, adversely effecting several organs including the heart, kidneys, eyes, and nerves. This review focuses on myocardial microvascular dysfunction, a condition characterized by altered vasomotion and long-term structural changes to coronary arterioles, resulting in impaired regulation of blood flow in response to varying oxygen demands of cardiomyocytes. Presence of myocardial microvascular dysfunction is associated with increased risk of cardiovascular disease, even in the absence of obstructive coronary artery disease. Several noninvasive imaging techniques to assess coronary physiology have significantly enhanced our understanding of the myocardial microcirculation. These methods allow for detailed visualization and quantification of blood flow, endothelial function, and inflammation in the microvasculature, providing critical insights into the early stages of microvascular disease in diabetes. A significant area of development is the use of advanced hybrid imaging techniques such as positron emission tomography/computed tomography (PET/CT) and positron emission tomography/magnetic resonance imaging (PET/MRI). The integration of advanced imaging technologies with artificial intelligence is also a key future direction. Overall, these advancements aim to improve the early detection and management of microvascular complications in diabetes, ultimately enhancing outcomes and quality of life. The aim of this review is to provide an overview of both established and emerging noninvasive imaging techniques for assessing myocardial microvascular dysfunction.