Anterior myocardial infarction

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Synonyms and keywords: Anterior MI

Overview

An anterior myocardial infarction (MI) is a heart attack or cessation of blood flow to the heart muscle that involves the anterior side of the heart. An anterior MI is characterized by the presence of ST elevation in the anterior leads V3 and V4. ST elevation in V1 and V2 corresponds to septal infraction whereas ST elevation in leads V5 and V6 corresponds to apical infarction.

EKG Examples

Shown below is an EKG demonstrating loss of R waves throughout the anterior wall (V1-V6). QS complexes in V3-V5. ST elevation in V1-V5 with terminal negative T waves.

Copyleft image obtained courtesy of, http://en.ecgpedia.org/wiki/Main_Page

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Shown below is an EKG demonstrating acute anterior MI. LAD artery occlusion.

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Shown below is an EKG demonstrating acute anterior myocardial infarction and left anterior hemiblock depicting ST elevation in precordial leads.

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Shown below is an EKG demonstrating old anterior myocardial infarction and bifascicular block (RBBB and LAHB) as indicated in the anterior chest leads.

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Shown below is an EKG illustrating acute MI with proximal LAD occlusion depicting ST elevation in anterior precordial leads.

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Shown below is an EKG demonstrating a 2 days old anterior infarction with Q waves in V1-V4 with persisting ST elevation, a sign of left ventricular aneurysm formation.

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Shown below is an EKG demonstrating a 2 weeks old anterior infarction with Q waves in V2-V4 and persisting ST elevation, a sign of left ventricular aneurysm formation.

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Shown below is an EKG demonstrating sinus rhythm. The remarkable feature is the poor R wave progression in the V1 and V2 leads and the ST elevation and T wave changes in leads V1 to V4 and I and aVL. The cardiogram suggests an anterior/ lateral MI possibly acute. There is also terminal P wave negativity in V1 suggesting a left atrial abnormality.

Copyleft image obtained courtesy of, http://en.ecgpedia.org/wiki/File:E209.jpg

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Shown below is an EKG showing sinus rhythm with anteroseptal myocardial infarction depicting ST elevation in V1-V6 and in lead I.

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Shown below is an EKG demonstrating acute myocardial infarction in in a patient with a pacemaker and LBBB. Concordant ST elevation in V5-V6 are clearly visible. There is discordant ST segment elevation > 5 mm in lead V3.

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Shown below is an EKG showing ST elevation MI.

Copyleft image obtained courtesy of, http://en.ecgpedia.org/wiki/File:De-KJcasus12.jpg

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Shown below is an EKG showing ST elevation in the anterior precordial leads, low voltages in all the leads, poor R wave progression in the precordial leads.

Copyleft image obtained courtesy of, http://en.ecgpedia.org/wiki/File:De-AMI_anterior_LAD_2days.jpg

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Shown below is an EKG demonstrating ST segment elevation in precordial leads signifying anterior myocardial infarction.

Copyleft image obtained courtesy of, http://en.ecgpedia.org/wiki/File:De-AMI_anterior.png

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Shown below is an EKG showing sinus rhythm with abnormal QRS and a Q wave in lead V2 which is suggestive of a previous anterior wall myocardial infarction.

Copyleft image obtained courtesy of, http://en.ecgpedia.org/wiki/File:E289.jpg

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