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Molecular Mechanisms of Microvascular Obstruction and Dysfunction in Percutaneous Coronary Interventions: From

Andre M Nicolau1, Pedro G Silva1, Hernan Patricio G Mejía1

  • 1Instituto do Coração, Faculdade de Medicina, Universidade de São Paulo (InCor/HCFMUSP), São Paulo 05403-900, Brazil.

International Journal of Molecular Sciences
|July 29, 2025
PubMed

Insights

Coronary microvascular dysfunction (CMVO) after heart attack treatment can impair blood flow despite open arteries. Understanding its complex causes is key to developing better treatments for this challenging condition.

Area of Science:

  • Cardiology
  • Vascular Biology
  • Medical Imaging

Background:

  • Coronary microvascular obstruction and dysfunction (CMVO) commonly occurs after primary percutaneous coronary intervention (PCI) in myocardial infarction patients.
  • Compromised microvascular perfusion can lead to adverse clinical outcomes, even with restored epicardial blood flow.

Purpose of the Study:

  • To elucidate the complex pathophysiology of CMVO following primary PCI.
  • To highlight diagnostic challenges and current limitations in assessing CMVO.
  • To review existing and potential therapeutic strategies for CMVO.

Main Methods:

  • Review of pathophysiological mechanisms including ischemia, embolization, reperfusion injury, inflammation, and endothelial dysfunction.
  • Discussion of diagnostic modalities, emphasizing the limitations of traditional angiography and the strengths of cardiac magnetic resonance imaging (CMR) and index of microvascular resistance (IMR).

Main Results:

  • CMVO involves microvascular spasm, endothelial swelling, capillary plugging, and oxidative stress.
  • Current diagnostic tools like TIMI flow and myocardial blush grade have limited sensitivity for CMVO.
  • CMR is the gold standard for CMVO identification, with IMR as a promising invasive measure.

Conclusions:

  • CMVO presents a significant therapeutic challenge in coronary artery disease management.
  • Existing treatments lack definitive efficacy in reversing established CMVO.
  • Further understanding of CMVO mechanisms is crucial for developing targeted and personalized therapies.
Keywords:
coronary microvascular obstructionmicrovascular dysfunctionno-reflow phenomenonreperfusion injury

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