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ECG Infarction Signs – Recognition and Meaning

ECG infarction signs are characteristic changes in the electrocardiogram that indicate a heart attack, enabling rapid diagnosis and life-saving treatment.

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ECG infarction signs are characteristic changes in the electrocardiogram that indicate a heart attack, enabling rapid diagnosis and life-saving treatment.

What Are ECG Infarction Signs?

The electrocardiogram (ECG) is one of the most important diagnostic tools when a heart attack is suspected. It records the electrical activity of the heart and reveals characteristic changes when heart muscle tissue is no longer adequately supplied with oxygen due to a blocked coronary artery. These changes are known as ECG infarction signs and are critical for rapid diagnosis and initiation of treatment.

Background and Pathophysiology

A heart attack (myocardial infarction) occurs when a coronary artery is blocked, typically by a blood clot. The downstream heart muscle tissue becomes ischemic (deprived of oxygen), leading to electrophysiological changes that are reflected in the ECG. The patterns seen vary depending on the stage of the infarction.

Key ECG Infarction Signs

ST-Segment Elevation

ST-segment elevation is the most well-known and clinically significant ECG infarction sign. It occurs in the early phase of a complete coronary artery occlusion and indicates a total interruption of blood supply. An infarction with ST elevation is called a STEMI (ST-Elevation Myocardial Infarction) and requires immediate intervention. ST elevation is considered significant when it exceeds 0.1 mV (1 mm) in at least two contiguous leads.

Pathological Q Wave

Pathological Q waves typically develop hours to days after the infarction event. They are a sign of necrotic (dead) heart muscle tissue and often persist permanently. A Q wave is considered pathological if it is wider than 0.04 seconds or exceeds 25% of the R wave amplitude.

T-Wave Changes

In the early phase of an infarction, tall, peaked T waves (hyperacute T waves) may appear first. Later, T-wave inversion commonly develops, indicating ischemia or repolarization disturbances in the myocardium.

ST-Segment Depression

ST-segment depression may indicate subendocardial ischemia, where the inner layers of the heart muscle are insufficiently perfused. This pattern is typical in NSTEMI (Non-ST-Elevation Myocardial Infarction) or unstable angina pectoris.

Bundle Branch Block

A newly occurring left bundle branch block (LBBB) on the ECG is also considered an infarction equivalent and must be treated like a STEMI, as it can mask a complete coronary artery occlusion.

Stages of Infarction on the ECG

Early stage (minutes to a few hours): Hyperacute T waves, beginning ST elevation
Acute stage (hours to approx. 24 hours): Pronounced ST elevations, onset of Q wave formation
Subacute stage (1–3 days): Regression of ST elevation, T-wave inversion, deep Q waves
Chronic stage (weeks to permanent): Persistent Q waves as scar signs, normalized or negative T waves

Localization of the Infarction Using the ECG

The affected ECG leads provide clues about the location of the infarction within the heart muscle:

Anterior wall infarction: Changes in leads V1–V4 (occlusion of the left anterior descending artery)
Inferior infarction: Changes in leads II, III, aVF (occlusion of the right coronary artery)
Lateral wall infarction: Changes in leads I, aVL, V5–V6 (occlusion of the left circumflex artery)
Right ventricular infarction: Detected via right-sided precordial leads (e.g., V3R, V4R)

Diagnosis and Clinical Relevance

The ECG is a central tool in emergency medicine. When a heart attack is suspected, a 12-lead ECG should be performed within 10 minutes of first medical contact. Interpretation of ECG infarction signs is always combined with the clinical picture (chest pain, shortness of breath) and laboratory values such as troponin, a specific biomarker for myocardial damage.

Treatment

Treatment is guided by the ECG findings:

STEMI: Immediate cardiac catheterization with percutaneous coronary intervention (PCI), reopening the blocked vessel using balloon dilation and stent implantation if needed. The target door-to-balloon time is under 90 minutes.
NSTEMI / unstable angina: Medical stabilization (antiplatelet agents, anticoagulation, beta-blockers, statins) and, depending on risk stratification, timely coronary angiography.

References

Thygesen K et al. - Fourth Universal Definition of Myocardial Infarction. European Heart Journal, 2018. DOI: 10.1093/eurheartj/ehy462
Ibanez B et al. - 2017 ESC Guidelines for the management of acute myocardial infarction in patients presenting with ST-segment elevation. European Heart Journal, 2018.
Hamm CW et al. - ESC Guidelines for the management of acute coronary syndromes in patients presenting without persistent ST-segment elevation. European Heart Journal, 2011.

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