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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
18:11

A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis

Published on: December 28, 2012

Initial risk stratification and presenting characteristics of patients with evolving myocardial infarctions

C D Miller1, G J Fermann, C J Lindsell

  • 1Department of Emergency Medicine, Wake Forest University Health Sciences, Medical Center Blvd, Winston Salem, NC 27157-1089, USA. cmiller@wfubmc.edu

Emergency Medicine Journal : EMJ
|July 29, 2008
PubMed

Insights

Patients with evolving myocardial infarction (EMI) present similarly to non-ST elevation myocardial infarction (NSTEMI) and are perceived as high-risk. This leads to similar diagnostic impressions, admissions, and revascularization rates for EMI patients.

Area of Science:

  • Cardiology
  • Emergency Medicine
  • Clinical Diagnostics

Background:

  • Chest pain is a common emergency department presentation.
  • Differentiating evolving myocardial infarction (EMI) from other causes is crucial for timely intervention.
  • Troponin levels are key biomarkers, but dynamic changes require careful interpretation.

Purpose of the Study:

  • To characterize patients with evolving myocardial infarction (EMI), defined by an initial negative and subsequent positive troponin test within 12 hours.
  • To compare the presentation and risk stratification of EMI patients with non-ST elevation myocardial infarction (NSTEMI) and no myocardial infarction (MI).

Main Methods:

  • Analysis of data from the Internet Tracking Registry for Acute Coronary Syndromes (i*trACS).
  • Inclusion of patients with undifferentiated chest pain, without ST elevation, and at least two troponin assays within 12 hours.
  • Stratification into three groups: EMI, NSTEMI, and no MI.

Main Results:

  • 5% of eligible patients had EMI, 8% had NSTEMI, and 87% had no MI.
  • EMI patients shared more similarities with NSTEMI patients than with no MI patients in demographics, presentation, and management.
  • Initial ECGs for EMI patients were often non-diagnostic (51%), yet physicians suspected high-risk conditions (76%), leading to critical care admissions (32%) and revascularization (17%).

Conclusions:

  • Patients presenting with evolving myocardial infarction (EMI) exhibit characteristics similar to those with non-ST elevation myocardial infarction (NSTEMI).
  • Clinicians perceive EMI patients as high-risk, reflected in diagnostic impressions, admission patterns, and revascularization rates comparable to NSTEMI.
  • The dynamic troponin profile in EMI necessitates careful risk assessment and management strategies.
Abstract

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