What is the importance of the left main stem artery?

Introduction. Left main coronary artery disease is of particular importance because left main stem (LMS) is responsible for 84% of the blood supplied to left ventricle in case of left coronary dominant system [1].

What is left stem disease?

Left main stem (LMS) disease is associated with significant morbidity and mortality. Traditionally coronary artery bypass grafting (CABG) has been the gold standard for treatment of these lesions.

Which of the following findings on electrocardiogram are indicative of left main coronary artery occlusion?

Classic findings on ECG that are taught to represent LMCA “occlusion” are: ST depression in leads I, II, aVL and V4-6. ST elevation in aVR ≥ 1mm. ST elevation in aVR ≥ V1.

Is the left main the lad?

Left Main Coronary Artery (also called the left main trunk) Left Anterior Descending artery (LAD)

What is left main stem stenosis?

Left main coronary artery (LMCA) stenosis is a relatively infrequent but important cause of symptomatic coronary artery disease. Multiple studies have found LMCA stenosis to be an independent indicator of increased morbidity and mortality rates among patients with coronary artery disease.

What is left main disease?

Left main coronary artery (LMCA) disease is the highest-risk lesion subset of ischemic heart disease, and has traditionally been an indication for coronary artery bypass grafting (CABG).

What is aVL on ECG?

aVL means augmented Vector Left; the positive electrode is on the left shoulder. aVF means augmented Vector Foot; the positive electrode is on the foot.

What is the left main?

The left main coronary artery supplies blood to the left side of the heart muscle (the left ventricle and left atrium). The left main coronary divides into branches: The left anterior descending artery branches off the left coronary artery and supplies blood to the front of the left side of the heart.

What is left main disease of the heart?

What is left main coronary stenosis?

What is the ECG pattern for subendocardial ischaemia?

ST depression does not localise, and thus subendocardial ischaemia due to oxygen supply/demand mismatch produces a consistent ECG pattern of lateral ST depression and reciprocal ST elevation in aVR

Which ECG findings are characteristic of critical LMCA stenosis?

This ECG demonstrates critical LMCA stenosis: Notice the diffuse ST depression in multiple leads (I, II, aVF, aVL, V2-V6) with reciprocal elevation in aVR. This pattern represents diffuse subendocardial ischemia due to flow limitation through the LMCA.

Is AVR Ste pattern representative of left main (LM) Omi?

Many experts consider the ECG pattern of STE in aVR, with diffuse ST depression elsewhere (referred to here as the “aVR STE pattern”), to be representative of left main (LM) OMI.

Does LM occlusion show up on ECG with AVR?

Depending on where the STE vector of the LM occlusion shows up on the ECG, there may be either STE, or STD, or neither in aVR, and lead aVR will not be the important part of the ECG interpretation in these cases. The ECG can have a variety of presentations in LM Occlusion.