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NBME 20 Answers

nbme20/Block 2/Question#18

A 65-year-old man is brought to the emergency ...

ST-segment elevation

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submitted by hayayah(418),

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.

charcot_bouchard  May i know where do u read this +1  

ST will first decrease; however, after 20 min it will increase (elevate)