A 12-lead electrocardiogram (ECG) demonstrating an acute ST-elevation myocardial infarction (STEMI) with characteristic anterior and anterolateral findings. The tracing displays a normal sinus rhythm with a heart rate of approximately 84 beats per minute and normal P wave morphology. Significant pathology is localized to the precordial leads, specifically V2 through V5, which exhibit pronounced ST-segment elevation. This elevation presents with a convex 'tombstoning' morphology, a high-risk indicator of extensive myocardial injury. Additionally, evolving QS waves are visible in leads V2 and V3, indicating necrotic changes or transmural infarction. These findings are clinically consistent with an acute occlusion of the left anterior descending (LAD) coronary artery. The limb leads (I, II, III, aVR, aVL, aVF) show relatively stable baselines, though mild reciprocal changes or secondary ST-T wave abnormalities may be present in the inferior leads. This diagnostic image serves as a classic educational example of early-stage STEMI progression and the visual identification of localized ischemic injury on electrocardiography.

This diagnostic image is a 12-lead electrocardiogram (ECG) displayed on standard grid paper, illustrating findings characteristic of high lateral ST-segment elevation myocardial infarction (STEMI). The primary visual pathology includes significant ST-segment elevation (STE) in the high lateral leads, specifically lead I and lead aVL, marked by large black arrows. This is accompanied by prominent reciprocal ST-segment depression (STD) in the inferior leads, III and aVF, highlighted by small black arrows. The QRS complexes appear relatively narrow without evidence of pathological Q waves at this stage. The ECG serves as an educational tool for identifying early ischemic changes and reciprocal patterns in the setting of acute coronary syndrome (ACS). It is highly relevant for medical training in cardiology, emergency medicine, and critical care, demonstrating the visual cues used to diagnose arterial occlusion (such as the left anterior descending or diagonal branches) in a post-cardiac arrest clinical context.

A standard 12-lead electrocardiogram (ECG) printed on standard red grid paper, demonstrating findings consistent with an acute inferior wall myocardial infarction (STEMI). The primary visual pathology includes significant ST-segment elevation in the inferior leads (II, III, and aVF). In lead III, the ST elevation is more pronounced than in lead II, a feature often associated with right ventricular involvement or a right coronary artery (RCA) occlusion. Reciprocal ST-segment depressions are visible in the lateral leads, particularly in lead I and aVL. The precordial leads (V1-V6) show mild ST-segment changes, with some flattening in V2 and V3. The QRS complexes are relatively narrow, and the baseline rhythm appears to be a regular sinus rhythm. This diagnostic image serves as a classic educational example of an ST-elevation myocardial infarction (STEMI) involving the inferior myocardial wall, highlighting the importance of recognizing regional lead patterns and reciprocal changes in emergency cardiology.

A standard 12-lead electrocardiogram (ECG) demonstrating findings characteristic of an acute inferior wall myocardial infarction (STEMI). The tracing reveals significant pathology in the inferior leads (II, III, and aVF), most notably a 2 mm coved (convex) ST-segment elevation. Lead III and aVF also display prominent pathologic Q waves, indicating evolving myocardial tissue injury or necrosis. Reciprocal ST-segment depression is visible in the high lateral leads (I and aVL), a classic finding in inferior STEMI. The precordial leads (V1-V6) show relatively normal R-wave progression and QRS morphology, though there is subtle ST-segment depression in V2 and V3, which may represent reciprocal changes or posterior extension. This diagnostic image is intended for cardiovascular education, illustrating the key electrocardiographic hallmarks used to identify acute coronary syndromes involving the right coronary artery or left circumflex distributions.