What are the ECG features in ST-elevation myocardial infarction (STEMI) (MI, heart attack)?

Updated: May 07, 2019
  • Author: A Maziar Zafari, MD, PhD, FACC, FAHA; Chief Editor: Eric H Yang, MD  more...
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In STEMI, typical ST-segment elevation persists for hours and is followed by inversion of T waves during the first few days and by the development of Q waves. However, initial ST depression or T-wave inversion associated with MI is difficult to differentiate from that seen in the presence of ischemia without MI or other unrelated conditions. ST-segment depression followed by T-wave inversion without the evolution of Q waves may result from non–ST-elevation MI (NSTEMI) or from subendocardial ischemia without MI.

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