Which leads on a 12 lead ECG focus on the septal aspect of the heart?
V1 and V2 represent the intraventricular septum, V3 and V4 lie approximately over the anterior left ventricle, and V5 and V6 approximate the lateral left ventricular wall (see Summary of Lead Groupings).
How does an MI present on ECG?
The ECG findings of an acute anterior myocardial infarction wall include: ST segment elevation in the anterior leads (V3 and V4) at the J point and sometimes in the septal or lateral leads, depending on the extent of the MI. This ST segment elevation is concave downward and frequently overwhelms the T wave.
What is a septal myocardial infarction?
The septum is the wall of tissue that separates the right ventricle of your heart from the left ventricle. Septal infarct is also called septal infarction. Septal infarct is usually caused by an inadequate blood supply during a heart attack (myocardial infarction). In the majority of cases, this damage is permanent.
What leads septal leads?
The septum is represented on the ECG by leads V1 and V2, whereas the lateral wall is represented by leads V5, V6, lead I and lead aVL.
Which leads on a 12 lead ECG are the limb leads and augmented limb leads?
For a routine analysis of the heart’s electrical activity an ECG recorded from 12 separate leads is used. A 12-lead ECG consists of three bipolar limb leads (I, II, and III), the unipolar limb leads (AVR, AVL, and AVF), and six unipolar chest leads, also called precordial or V leads, ( , , , , , and ).
What are the septal leads?
The septum is represented on the ECG by leads V1 and V2, whereas the lateral wall is represented by leads V5, V6, lead I and lead aVL. To make things more complicated, sometimes the LAD “wraps around” the cardiac apex, which is a common anatomic variant.
What does a 3 lead ECG show?
3-lead ECGs are used most often for recording a 24-hour reading. A 24-hour reading is a frequently used tool for the diagnosis of heart problems and is reimbursed as a long-term reading.
Does echocardiogram show septal infarct?
Electrocardiographic, echocardiographic, and angiographic findings were consistent with septal myocardial infarction, but not definitive enough to make a diagnosis of isolated septal myocardial infarction.
Which ECG leads are posterior?
ST elevation in the posterior leads of a posterior ECG (leads V7-V9). Suspicion for a posterior MI must remain high, especially if inferior ST segment elevation is also present.
How is the septum represented on an ECG?
The septum is represented on the ECG by leads V1 and V2, whereas the lateral wall is represented by leads V5, V6, lead I and lead aVL. To make things more complicated, sometimes the LAD “wraps around” the cardiac apex, which is a common anatomic variant. This results in part of the inferior wall being supplied by the LAD, as well.
What happens if you miss a ST segment elevation MI on an ECG?
Missing a ST segment elevation MI on the ECG can lead to bad patient outcomes. It’s just not good. So let’s go over the ECG findings in STEMI — again, and again, and again — with multiple examples. This way, you can drill into your memory what each type of STEMI looks like on the 12-lead ECG.
What should you know about 12 lead ECG?
Identifying an acute myocardial infarction on the 12-lead ECG is the most important thing you can learn in ECG interpretation. Time is muscle when treating heart attacks. Missing a ST segment elevation MI on the ECG can lead to bad patient outcomes.
What are the criteria for a posterior MI ECG?
The ECG criteria to diagnose a posterior MI — treated like a STEMI, even though no real ST segment elevation is apparent — include: ST segment depression (not elevation) in V1 to V4. Think of things backwards. These are the septal and anterior ECG leads.