[STEMI equivalents on the ECG - a case-based presentation]
Insights
The 12-lead ECG is crucial for diagnosing ST-segment elevation myocardial infarction (STEMI). Recognizing subtle STEMI equivalents on ECGs can improve diagnosis and patient outcomes.
Area of Science:
- Cardiology
- Medical Diagnostics
Background:
- The 12-lead resting electrocardiogram (ECG) is vital for diagnosing acute chest pain, especially ST-segment elevation myocardial infarction (STEMI).
- Prompt identification of STEMI enables immediate coronary reperfusion therapy, typically primary percutaneous coronary intervention (PCI).
Observation:
- Interpreting ECGs in acute chest pain can be challenging.
- Beyond classical ST-segment elevations, several ECG findings can indicate acute coronary occlusion, termed STEMI equivalents.
- These include hyperacute T-waves, subtle ST-segment elevations, specific patterns of ST-segment elevation/depression in certain leads (e.g., aVR/V1 with depression in ≥8 leads), and specific changes in leads V1/V2.
Findings:
- This article presents a case-based review of various STEMI equivalents on the ECG.
- The focus is on improving the correct interpretation of these subtle findings.
Implications:
- Accurate interpretation of STEMI equivalents can lead to earlier diagnosis and treatment.
- Improved ECG interpretation can enhance patient prognosis in cases of acute coronary occlusion.
Abstract:
The 12-lead resting ECG remains an indispensable diagnostic tool in patients with acute chest pain. This is particularly important as the identification of ST-segment elevations leads to the diagnosis of ST-segment elevation myocardial infarction (STEMI) and subsequent, immediate coronary reperfusion (usually via primary PCI). However, correct interpretation of the 12-lead ECG in patients with acute chest pain remains challenging. Apart from "classical" ST-segment elevations there are several "equivalents" in the ECG pointing towards an acute coronary occlusion. Among these, hyperacute T-waves, subtle ST-segment elevations, ST-segment elevation in leads aVR/V1 with concomitant ST-segment depression in ≥ 8 other leads and high R-peak with positive T-waves combined with horizontal ST-segment depression in leads V1/V2 can be found. This article provides a case-based presentation of STEMI equivalents on the ECG in order to improve correct ECG interpretation and prognosis of such patients.
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