Is myocardial ischemia the same as myocardial infarction?
Myocardial ischemia occurs when blood flow to the heart muscle (myocardium) is obstructed by a partial or complete blockage of a coronary artery by a buildup of plaques (atherosclerosis). If the plaques rupture, you can have a heart attack (myocardial infarction).
What is Inferolateral wall MI?
An inferior wall MI — also known as IWMI, or inferior MI, or inferior ST segment elevation MI, or inferior STEMI — occurs when inferior myocardial tissue supplied by the right coronary artery, or RCA, is injured due to thrombosis of that vessel.
What is the difference between ischemia and infarction?
The term ischemia means that blood flow to a tissue has decreased, which results in hypoxia, or insufficient oxygen in that tissue, whereas infarction goes one step further and means that blood flow has been completely cut off, resulting in necrosis, or cellular death.
What are signs of ischemia on ECG?
The most common ECG sign of myocardial ischemia is flat or down-sloping ST-segment depression of 1.0 mm or greater. This report draws attention to other much less common, but possibly equally important, ECG manifestations of myocardial ischemia.
Why does MI cause bradycardia?
The commonest pathological cause of sinus bradycardia is acute myocardial infarction. Sinus bradycardia is particularly associated with inferior myocardial infarction as the inferior myocardial wall and the sinoatrial and atrioventricular nodes are usually all supplied by the right coronary artery.
Where do most mis occur in the heart?
Often it occurs in the center or left side of the chest and lasts for more than a few minutes.
How is MI diagnosed?
An MI is diagnosed when two of the following criteria are met:
- Symptoms of ischemia.
- New ST-segment changes or a left bundle branch block (LBBB)
- Presence of pathological Q waves on the ECG.
- Imaging study showing new regional wall motion abnormality.
- Presence of an intracoronary thrombus at autopsy or angiography.