Initial phase of myocardial infarction leads to subendocardial necrosis involving < 50% of the myocardial thickness (subendocardial infarction); EKG shows ST-segment depression.
Continued or severe ischemia (>20 minutes) leads to transmural necrosis involving most of the myocardial wall (transmural infarction); EKG shows ST-segment elevation.
mbourne@hayayah, Although this is a bit outside of the realm of Step 1, I want to clarify a point. Early MI does not typically lead to ST-depression. Early MI will typically present with hyperacute T-waves with straightening of the ST segment, and then evolve towards more familiar "STEMI" morphology.
Great image representation of MI EKG changes: https://4.bp.blogspot.com/-_UbS4PvbTZE/Wr0M27TZhUI/AAAAAAAABB0/-M8FSuvTKeEGkx-7HrEd45Fl0phb2-T8gCLcBGAs/s1600/Progression%2Bof%2BACO%2Bfinal_diagram.png
ST depression from subendocardial ischemia can occur with supply/demand mismatch --> ISCHEMIA, but not Myocardial INFARCTION.+2020-01-11T16:09:07Z
to snoo-finity ... and beyond!
submitted by hayayah(603), 2019-05-15T22:39:45Z
This man is showing sxs of an MI.
Initial phase of myocardial infarction leads to subendocardial necrosis involving < 50% of the myocardial thickness (subendocardial infarction); EKG shows ST-segment depression.
Continued or severe ischemia (>20 minutes) leads to transmural necrosis involving most of the myocardial wall (transmural infarction); EKG shows ST-segment elevation.