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There is debate and confusion regarding where and how to measure ST elevation (STE). Do you measure the STE at the J-point? Or at 40 msec after the J-point? And how much STE is considered significant? The current guidelines have clarified this issue.
- STE should be measured at the J-point.
- STEMI is defined by STE ≥ 1 mm in at least 2 contiguous leads, with the exception of leads V2-V3.
- STEMI is defined by STE ≥ 2 mm in leads V2-V3 in men.
- STEMI is defined by STE ≥ 1.5 mm in leads V2-V3 in women.
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References
2013 ACCF/AHA Guideline for the Management of ST-Elevation Myocardial Infarction
O'Gara PT, Kushner FG, Ascheim DD, et al; American College of Cardiology Foundation/American Heart Association Task Force on Practice Guidelines Circulation. 2013;127:e362-e425 Pubmed Link