3 hours of chest pain. Is it STEMI or is it normal (or early repolarization)? This looks quite normal, with only moderate ST elevation, upward concavity, good R-wave amplitude, no ST depression or T-wave inversion. But one characteristic makes it unlikely to be normal: the computerized QTc is 455 milliseconds. In a study of early repolarization (ER) (n=167) near completion, only 2 of 167 (2%) cases of ER had a QTc > 455. The mean QTc was 394, compared to 420 for MI (n=125) from LAD occlusion. Conversely, only 4% of LAD occlusion, vs. 40% of ER, had a QTc < 380 ms. These clues were not appreciated by the clinicians. 70 minutes later, they repeated the ECG, which is shown here: Note that now there are tiny Q-waves in V2-V4 , making this unequivocally diagnostic of acute STEMI. These subtle Q-waves were not appreciated, but the clinicians were astute and ordered a stat echocardiogram, which confirmed anterior wall motion abnormality. The patient was taken to the cath lab and had