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When a voltage is applied to a conductor, an electrical field is generated, and charges in the conductor feel the force due to the electrical field. The current density that results depends on the electrical field and the properties of the material. In some materials, including metals at a given temperature, the current density is approximately proportional to the electrical field. In these cases, the current density can be modeled as:
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When a current moves through any conductor, the conductor causes some level of difficulty for the current to flow. The measure of that difficulty is known as the resistance of the material and is represented by R. Every material has its own resistance. In the case of conductors, heat is emitted whenever a current passes through them. Resistance depends on the resistivity of the material. Resistivity is a characteristic of the material used to fabricate electrical components, whereas the...
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Insulin: The Receptor and Signaling Pathways01:28

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Insulin action is mediated through a receptor tyrosine kinase, akin to the IGF-1 receptor. The number of receptors per cell varies significantly, from 40 on erythrocytes to 300,000 on adipocytes and hepatocytes. The insulin receptor consists of linked α/β subunit dimers, forming a heterotetramer glycoprotein with two extracellular α subunits and two β subunits spanning the membrane. The α subunits inhibit the inherent tyrosine kinase activity of the β subunits, but...
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Insulin preparations are categorized by their duration of action into short-acting and long-acting types. Two strategies are used to modify insulin's absorption and pharmacokinetic profile: slowing the absorption post-subcutaneous injection, or altering human insulin's amino acid sequence or protein structure. These changes retain the insulin's ability to bind to the insulin receptor, but alter its behavior in solution or after injection.
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Oxygenation-sensitive Cardiac MRI with Vasoactive Breathing Maneuvers for the Non-invasive Assessment of Coronary Microvascular Dysfunction
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Insulin resistance and coronary microvascular dysfunction: a complex interplay.

Martina Magistri1,2, Leonardo Portolan1, Aurora Trevisanello1

  • 1Division of Cardiology, Department of Medicine, University of Verona, Verona, Italy.

Cardiovascular Diabetology
|January 20, 2026
PubMed
Summary
This summary is machine-generated.

Insulin resistance (IR) is linked to chest pain without artery blockages (INOCA) through coronary microvascular dysfunction and vasospasm. Understanding this connection may reveal new treatments for heart conditions in patients with IR.

Keywords:
Coronary angiographyCoronary flow reserveCoronary microvascular dysfunctionCoronary vasospasmHyperinsulinaemic-euglycaemic clamp testIndex of microcirculatory resistanceInsulin resistance

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Area of Science:

  • Cardiology
  • Endocrinology
  • Pathophysiology

Background:

  • Ischaemia and non-obstructive coronary artery disease (INOCA) affects up to 40-60% of patients with angina.
  • Coronary microvascular dysfunction (CMD) and coronary vasospasm are key mechanisms in INOCA.
  • Insulin resistance (IR) is a significant cardiovascular risk factor, preceding type 2 diabetes mellitus (T2DM) and contributing to endothelial dysfunction and inflammation.

Purpose of the Study:

  • To review the evidence linking insulin resistance (IR) to coronary microvascular dysfunction (CMD) and coronary vasospasm.
  • To explore the pathophysiological mechanisms and diagnostic approaches for INOCA in the context of IR.
  • To identify future research directions for understanding INOCA endotypes related to IR.

Main Methods:

  • Literature review of studies investigating the relationship between IR, CMD, and coronary vasospasm.
  • Synthesis of current evidence on pathophysiological pathways.
  • Analysis of diagnostic strategies for INOCA.

Main Results:

  • IR contributes to endothelial dysfunction and inflammation, key processes in CMD and vasomotor dysfunction.
  • Hyperinsulinaemia, dysglycaemia, and oxidative stress are implicated in the complex relationship between IR and INOCA.
  • The precise molecular mechanisms linking IR to different INOCA endotypes require further elucidation.

Conclusions:

  • IR is a critical factor in the development of INOCA, impacting both CMD and coronary vasospasm.
  • Targeting IR may offer therapeutic strategies for improving microvascular function and reducing symptoms in INOCA patients.
  • Further research is needed to fully define the molecular pathways and develop targeted therapies for IR-associated INOCA.