How do you read an ECG for MI?
Turn the ECG upside down, and it would look like a STEMI. The ratio of the R wave to the S wave in leads V1 or V2 is greater than 1. This represents an upside-down Q wave (similar in reason to the ST depression instead of elevation). ST segment elevation in the posterior leads of a posterior ECG (leads V7-V9).
What is anterior MI?
An anterior myocardial infarction results from occlusion of the left anterior descending coronary artery. This can cause an ST elevation myocardial infarction or a non-ST segment elevation myocardial infarction.
Which leads look at the anterior wall?
The arrangement of the leads produces the following anatomical relationships: leads II, III, and aVF view the inferior surface of the heart; leads V1 to V4 view the anterior surface; leads I, aVL, V5, and V6 view the lateral surface; and leads V1 and aVR look through the right atrium directly into the cavity of the …
How do I know if I have anterior or posterior MI?
The ECG findings of an acute posterior wall MI include the following: ST segment depression (not elevation) in the septal and anterior precordial leads (V1-V4). This occurs because these ECG leads will see the MI backwards; the leads are placed anteriorly, but the myocardial injury is posterior.
What is anterior wall?
An anterior wall myocardial infarction may also be known as anterior wall MI (AWMI) or anterior ST segment elevation MI (anterior STEMI). When an AWMI extends to the septal and lateral regions as well, the culprit lesion is usually more proximal in the LAD or even in the left main coronary artery.
What is V1 and V2 in heart?
V1, V2 = RV. V3, V4 = septum. V5, V6 = L side of the heart. Lead I = L side of the heart. Lead II = inferior territory.
How do I know if my wall is posterior MI?
Posterior infarction is diagnosed based on the presence of ST segment elevation >0.5mm in leads V7-9. Note that there is also some inferior STE in leads III and aVF (but no Q wave formation) suggesting early inferior involvement.
Why is anterior wall MI?
An anterior wall myocardial infarction occurs when anterior myocardial tissue usually supplied by the left anterior descending coronary artery suffers injury due to lack of blood supply.