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Published on: April 25, 2014

Acute myocardial infarction and underlying stenosis severity

Ole Frøbert1, Marcel van't Veer, Wilbert Aarnoudse

  • 1Department of Cardiology, Center for Cardiovascular Research, Aalborg Hospital, Aarhus University Hospital, University of Aarhus, Denmark.

Catheterization and Cardiovascular Interventions : Official Journal of the Society for Cardiac Angiography & Interventions
|July 11, 2007
PubMed

Insights

Contrary to popular belief, most heart attacks stem from significant arterial blockages, not mild ones. This study found that over 96% of acute myocardial infarction cases involved underlying stenosis greater than 50%.

Area of Science:

  • Cardiology
  • Interventional Cardiology
  • Vascular Biology

Background:

  • A common belief suggests acute myocardial infarction (AMI) often arises from mild arterial narrowing.
  • This notion contradicts practical observations from interventional cardiology procedures like primary percutaneous coronary intervention (PCI).

Purpose of the Study:

  • To investigate the actual severity of arterial stenosis in the culprit lesion among patients experiencing acute myocardial infarction.
  • To challenge the prevailing assumption regarding the degree of luminal stenosis in AMI.

Main Methods:

  • Quantitative coronary angiography (QCA) was performed on 250 consecutive patients undergoing primary PCI for AMI.
  • Inclusion criteria required reliable QCA assessment of the culprit lesion, either through spontaneous reflow or post-wiring assessment, allowing evaluation of stenosis before infarction.

Main Results:

  • Of 250 patients, 156 (62%) met criteria for reliable QCA.
  • In 96% of these patients, the underlying stenosis severity exceeded 50%, and in 66%, it was greater than 70%.
  • No significant differences in stenosis severity were observed across different coronary artery territories (LAD, Cx, RCA) or between sexes.

Conclusions:

  • The findings indicate that, contrary to common belief, the majority of acute myocardial infarctions are associated with significant arterial stenosis.
  • This suggests a need to re-evaluate the understanding of plaque vulnerability and rupture mechanisms in AMI.
Abstract

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