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Intracoronary microparticles and microvascular obstruction in patients with ST elevation myocardial infarction

Italo Porto1, Luigi Marzio Biasucci, Giovanni Luigi De Maria

  • 1Department of Cardiovascular Medicine, Catholic University of the Sacred Heart, L.go A. Gemelli, 8, 00168 Rome, Italy. italo.porto@gmail.com

European Heart Journal
|March 29, 2012
PubMed
Abstract

Insights

Microparticles (MPs) in ST-elevation myocardial infarction (STEMI) are higher locally than systemically. Intracoronary MPs correlate with microvascular obstruction, suggesting a role in its pathogenesis.

Area of Science:

  • Cardiology
  • Hematology
  • Vascular Biology

Background:

  • Microparticles (MPs) are cell fragments elevated in acute coronary syndromes.
  • Platelet-derived MPs (PMP) and endothelial-derived MPs (EMP) are key components.

Purpose of the Study:

  • Assess systemic and local PMP and EMP levels in ST-elevation myocardial infarction (STEMI).
  • Correlate MP levels with microvascular obstruction (MVO) indexes post-primary percutaneous coronary intervention.

Main Methods:

  • Analyzed 78 STEMI patients undergoing primary PCI.
  • Measured PMP (CD42+CD31+) and EMP (CD42-CD31+) in aortic and intracoronary blood via cytofluorimetry.
  • Assessed angiographic and electrocardiographic MVO indicators.

Main Results:

  • Intracoronary PMP and EMP levels were significantly higher than aortic levels.
  • Intracoronary MPs correlated with thrombus score and microvascular dysfunction indexes.
  • Intracoronary PMP independently predicted MVO.

Conclusions:

  • Elevated MPs, particularly intracoronary, indicate ongoing thrombosis.
  • MPs may play a direct role in the pathogenesis of microvascular dysfunction in STEMI.

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