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A Research Method For Detecting Transient Myocardial Ischemia In Patients With Suspected Acute Coronary Syndrome Using Continuous ST-segment Analysis
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[Diagnosis of recent posterolateral myocardial infarction: an electrocardiographic, echocardiographic and

G P Perna1, G Valle, M P Salvatori

  • 1Servizio di Cardiologia e UTIC, Ospedale Regionale Generale Casa Sollievo della Sofferenza S. Giovanni Rotondo Foggia.

Giornale Italiano Di Cardiologia
|December 1, 1990
PubMed

Insights

Electrocardiography (ECG) is more sensitive than 2D echocardiography for detecting previous posterolateral myocardial infarction, especially when combined with specific criteria. Echocardiography may miss these events if inferior infarction is also present.

Area of Science:

  • Cardiology
  • Medical Imaging
  • Diagnostic Tools

Background:

  • Previous myocardial infarction (MI) can lead to specific regional wall motion abnormalities.
  • Posterolateral MI poses diagnostic challenges, often requiring advanced imaging techniques.
  • Assessing the diagnostic accuracy of non-invasive methods for MI detection is crucial.

Purpose of the Study:

  • To evaluate the sensitivity and specificity of standard electrocardiography (ECG) and 2D echocardiography in recognizing previous posterolateral myocardial infarction.
  • To compare the diagnostic performance of ECG and 2D echocardiography in patients with isolated posterolateral defects versus those with combined posterolateral and inferoapical defects.

Main Methods:

  • Studied 64 patients with previous MI and confirmed posterolateral defects via 201TI scintigraphy, divided into isolated posterolateral (n=47) and combined defects (n=17).
  • Included 30 healthy controls.
  • Calculated sensitivity, specificity, and predictive values for ECG criteria and 2D echocardiography (wall motion abnormalities).
  • Utilized multivariate analysis for ECG data.

Main Results:

  • A positive T wave in V1 on ECG showed 100% sensitivity and 76% specificity for posterolateral MI.
  • A 2-variable ECG model (positive T wave in V1 + R/S ratio ≥ 1 in V1-V2) achieved 95-100% sensitivity and 80% specificity.
  • 2D echocardiography demonstrated 70% sensitivity for isolated posterolateral MI but only 29% sensitivity when inferior MI was also present, with 100% specificity.
  • ECG proved more sensitive but less specific than 2D echocardiography.

Conclusions:

  • Standard ECG is a highly sensitive tool for identifying previous posterolateral myocardial infarction.
  • 2D echocardiography's sensitivity for posterolateral MI is significantly reduced in the presence of associated inferior MI.
  • Multivariate ECG analysis offers improved diagnostic accuracy for detecting posterolateral myocardial infarction.

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