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Why does a “STEMI” cause ST elevation?
By Avraham Cooper, MD (Link)
- Ischemia leads to a decrease in ATP production.
- This leads to an increase in potassium export and faster depolarization.
- An ischemic to non-ischemic current is created, thus lowering the EKG baseline during periods of repolarization (not depolarization).
- With depolarization, the gradient stops, thus the ST segment is isoelectric.
- This gives the appearance of ST elevation.