Which ECG indicates MI?
Which ECG indicates MI?
One of the most significant findings of myocardial infarction is the presence of ST segment elevation. The ST segment is the part of the ECG tracing that starts at the end of the S wave and ends at the beginning of the T wave. The point where the end of the Q wave and the ST segment meet is called the J point.
What happens when the left circumflex artery is blocked?
When occluded, the circumflex coronary artery can cause a lateral myocardial infarction resulting in ST elevation in the lateral leads. The lateral ECG leads are considered lead V5-V6 and the “high lateral” ECG leads are lead I and aVL.
Which arteries are affected in MI?
The vast majority of MI involves the anterior wall (78%). The most common coronary artery affected is the left anterior descending (LAD) branch. Coronary dissection is the primary cause of infarction in the peripartum period and more commonly in the postpartum period.
How do you identify lateral wall MI on ECG?
ECG Findings
- ST-Elevated LMI: ST elevation in lead I, aVL, V5, and V6; Reciprocal ST depression in inferior lead III and aVF.
- High lateral STEMI: High lateral STEMI can present as ST-elevation involving lead I and aVL.
- Old LMI presents with deep and broad Q waves I leads I and aVL.
Why is St elevated in MI?
An acute ST-elevation myocardial infarction occurs due to occlusion of one or more coronary arteries, causing transmural myocardial ischemia which in turn results in myocardial injury or necrosis.
How important is the left circumflex artery?
The left anterior descending artery branches off the left coronary artery and supplies blood to the front of the left side of the heart. The circumflex artery branches off the left coronary artery and encircles the heart muscle. This artery supplies blood to the lateral side and back of the heart.
Which artery is most commonly occluded in myocardial infarction?
The left anterior descending artery was the most common culprit artery (48.3%), followed by the right coronary artery (30.9%), and the circumflex artery (20.8%). The most common acute STEMI type was inferior MI (52%)….Table 1.
| Rentrop score | Number of patients | % |
|---|---|---|
| 0 | 54 | 26,1 |
| 1 | 50 | 24,2 |
| 2 | 51 | 24,6 |
| 3 | 52 | 25,1 |
What leads lateral MI?
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.
