Abstract
ST segment refers to the line connecting the end of QRS complex and the beginning of T wave. Pathologically, ECG tracing may show ST segment elongation or shortening but more often the elevation and depression, such as the ST pattern in myocardium ischemia (MI). So in MI, as the ST vector points from normal myocardial cells to abnormal ones, ST segment elevation could be seen on patients with subepicardial ischemia (transmural myocardial ischemia), and the direction of vector is from endocardium to epicardium and ST segment depression on those with subendocardial ischemia, with the direction of vector from epicardium to endocardium. Besides, it is worth noting that MI can generally disturb the normal depolarization of ventricular myocardium, which may lead to some other ST abnormal signs on ECG tracing.
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© 2016 Springer Science+Business Media Singapore Pte Ltd. and People's Medical Publishing House
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Zeng, R., Diao, K., Cheng, F., Ma, S. (2016). ST Segment. In: Zeng, R. (eds) Graphics-sequenced interpretation of ECG. Springer, Singapore. https://doi.org/10.1007/978-981-287-955-4_5
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DOI: https://doi.org/10.1007/978-981-287-955-4_5
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