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.
Herein, how does MI cause ST elevation?
Accordingly, ST segment elevation during acute myocardial infarction requires the injury current to flow in the opposite direction [12, 13, 24], which can be caused by greater depression of the epicardial action potential.
- depressed ST wave or T-wave inversion.
- no progression to Q wave.
- partial blockage of the coronary artery.
Keeping this in view, how is posterior MI detected in ECG?
In this ECG, posterior MI is suggested by the presence of:
- ST depression in V2-3.
- Tall, broad R waves (> 30ms) in V2-3.
- Dominant R wave (R/S ratio > 1) in V2.
- Upright terminal portions of the T waves in V2-3.
How is posterior MI treated?
The definitive management of acute posterior STEMI is reperfusion therapy. Optimally this is done via percutaneous coronary intervention (PCI), though the next option would be fibrinolytic therapy. PCI is the preferred option if it can be initiated within 120 minutes, though within 90 minutes is the goal.
Is anterior ischemia serious?
Myocardial ischemia can lead to serious complications, including: Heart attack. If a coronary artery becomes completely blocked, the lack of blood and oxygen can lead to a heart attack that destroys part of the heart muscle. The damage can be serious and sometimes fatal.
What are the 5 types of myocardial infarction?
ST segment elevation myocardial infarction (STEMI) non-ST segment elevation myocardial infarction (NSTEMI) coronary spasm, or unstable angina.
What causes 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.
What does inferior MI mean?
An inferior myocardial infarction (MI) is a heart attack or cessation of blood flow to the heart muscle that involves the inferior side of the heart. Inferior MI results from the total occlusion of either the right coronary artery in 85% of the cases or the left circumflex in 15% of the cases.
What is an anterior infarct?
Anterior myocardial infarction is associated with a decrease in blood supply to the anterior wall of the heart. Classification of anterior myocardial infarction is based on EKG findings as follows: Anteroseptal – ST-segment elevation in leads V1 to V4. Anteroapical (or mid-anterior) – ST-segment elevation in leads V3- …
What is the treatment for anterior infarct?
The treatment of MI includes, aspirin tablets, and to dissolve arterial blockage injection of thrombolytic or clot dissolving drugs such as tissue plasminogen activator, streptokinase or urokinase in blood within 3 h of the onset of a heart attack.
Which leads are affected in anterior MI?
When a patient has an anterior-wall MI, you’ll see the indicative changes in leads V1 through V4 and the reciprocal changes in lateral leads I and aVL and inferior leads II, III, and aVF.
Which leads show inferior MI?
Upon ECG analysis, inferior STEMI displays ST-elevation in leads II, III, and aVF. There are subtle differences in the ECG pattern depending on the artery occluded. Reciprocal changes (ST-segment depression) may be seen in lead aVL [6].
Which leads show posterior wall 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.