How do these ST elevations actually develop?

In the acute stage of an infarction, cardiac ischemia leads to persistent fluctuations in the electrical activity of the affected myocardial region. Due to these fluctuations, no zero line is visible between excitation and repolarization. From the beginning of the excitation to the end of repolarization, the main vector points to this infarction area, or to put it in terms of ECG-vocabulary, from the beginning of the QRS complex to the end of the T wave.

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