NBME 20 ST-segment elevation (NBME Answers)

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submitted by hayayah(1100),

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charcot_bouchard May i know where do u read this +2

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. +2