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Usefulness of endothelin-1 assessment in acute myocardial infarction

Xavier Freixa1, Magda Heras, José T Ortiz

  • 1Servicio de Cardiología, Instituto del Tórax, Hospital Clínic de Barcelona, Universidad de Barcelona, Barcelona, España. freixa@clinic.ub.es

Revista Espanola De Cardiologia
|January 7, 2011
PubMed

Insights

High endothelin-1 (ET-1) levels after myocardial infarction (MI) are linked to microvascular obstruction. This study found elevated ET-1 is associated with poorer outcomes and reduced myocardial salvage in STEMI patients.

Area of Science:

  • Cardiology
  • Biomedical Research
  • Molecular Medicine

Background:

  • Elevated endothelin-1 (ET-1) is associated with adverse outcomes in ST-segment elevation myocardial infarction (STEMI).
  • Coronary microcirculation vasoconstriction is a proposed mechanism linking ET-1 to poor outcomes.
  • Understanding ET-1's role in myocardial infarction (MI) is crucial for improving patient prognosis.

Purpose of the Study:

  • To investigate the impact of ET-1 on microvascular integrity in evolving MI.
  • To assess the relationship between ET-1 levels and infarct size, left ventricular ejection fraction (LVEF), and myocardial salvage index (MSI).
  • To determine ET-1's predictive value for microvascular obstruction (MO) and myocardial salvage.

Main Methods:

  • ET-1 levels were measured in 127 first STEMI patients within 6-24 hours.
  • Contrast-enhanced cardiac magnetic resonance (ce-CMR) was used in 94 patients to evaluate MO, infarct size, and LVEF within one week.
  • MSI was calculated as the percentage of at-risk myocardium without necrosis.

Main Results:

  • Patients with ET-1 levels above the median (6.8 pg/mL) showed significantly higher MO (77.7% vs. 16.6%) and lower MSI (13.8% vs. 37.4%).
  • ET-1 levels did not significantly correlate with infarct size or LVEF.
  • Multivariate analysis identified ET-1 as a predictor of MO (OR=2.78) and low MSI (OR=1.69).

Conclusions:

  • High ET-1 levels post-MI are significantly associated with the presence of microvascular obstruction.
  • Elevated ET-1 is linked to reduced myocardial salvage, indicating poorer outcomes in STEMI patients.
  • ET-1 may serve as a biomarker for microvascular dysfunction after myocardial infarction.
Abstract

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