What is left main occlusion?
Left main occlusion is associated with a dire prognosis, as the left main supplies blood to >75 % of the left ventricle. This is a case showing a classic electrocardiogram (ECG) together with the echocardiogram videos and images from coronary angiography.
What happens if the left coronary artery is occluded?
According to the literature total occlusion of the left main coronary artery usually causes a large infarction of the anterior wall leading to cardiogenic shock or sudden cardiac death.
What ECG changes are associated with an occlusion to the left anterior descending artery?
Occlusion in the left anterior descending artery ST-segment elevations may be present in leads V1–V6, and frequently aVL, I (the latter two may be affected because the diagonals given off by the LAD supplies the apical part of the lateral wall).
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.
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?
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 can an occluded coronary artery lead to?
Coronary artery occlusion causes heart tissue damage due to ischemia and can lead to myocardial infarction (MI) [6–11]. The immediate and common cause of artery obstruction is the formation of a thrombus or a ruptured plaque.
Can a blocked artery be unblocked?
There are no quick fixes for melting away plaque, but people can make key lifestyle changes to stop more of it accumulating and to improve their heart health. In serious cases, medical procedures or surgery can help to remove blockages from within the arteries.
Is the left main the LAD?
Left Main Coronary Artery (also called the left main trunk) Left Anterior Descending artery (LAD)
What is the left main coronary artery?
Is the left main the lad?
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 are the typical ECG findings with LMCA occlusion?
Typical ECG findings with LMCA occlusion: Review this ECG in a patient with acute chest pain: There is diffuse ST depression, with ST elevation in aVR. This is diffuse subendocardial ischemia. The ST elevation in aVR is reciprocal to the ST depression vector that is directed anterior, lateral, and inferior (toward leads II and V5).
How many syndromes are caused by complete left main occlusion?
Therefore, complete left main occlusion causes at least two syndromes to occur simultaneously: a proximal anterior STEMI producing ST elevation in aVR and V1-4 in addition to a lateral STEMI producing ST elevation in I, aVL and V5-6.
Which ECG findings are characteristic of acute cardiac occlusion?
Such acute occlusion most often causes sudden cardiac death due to simultaneous anterior, lateral and posterior STEMI. More recent publications recognise this ECG pattern as consistent with left main coronary artery subocclusion or complete occlusion with well-developed collateral circulation.
Does Lad occlusion show up on ECG?
Some total LAD occlusion manifest on the ECG similarly to some left main occlusions. All are, however, clearly massive STEMI. To reiterate the most important part relevant to your question: LM occlusion does not present with isolated STE in aVR.