Source: Academic Life in Emergency Medicine
Formula to differentiate early repolarization from STEMI:
(1.196 x STE60V3) + (0.059 x QTc) – (0.326 x RA V4)
- STE60V3 = STE elevation height at 60 msec (1.5 small boxes) after the J-point in lead V3 (mm)
- QTc = The computer-read QTc interval
- RA V4 = R wave amplitude in lead V4 (mm)
A result of > 23.4 is predictive of a LAD occlusion causing a STEMI, rather than early repolarization.