In an ECG recorded at a paper speed of 25 mm/s and an amplification of 10 mm/mV, the ST segment elevation from the baseline should be measured 80 ms after the J point and is considered present if the deviation is ≥0.2 mV in men and ≥0.15 mV in women in V2–V3 leads (≥0.1 mV in other leads).
ST-segment elevation usually indicates a total blockage of the involved coronary artery and that the heart muscle is currently dying.
Non-STEMI heart attacks usually involve an artery with partial blockage, which usually does not cause as much heart muscle damage.
The ST segment encompasses the region between the end of ventricular depolarization and beginning of ventricular repolarization on the ECG.
In other words, it corresponds to the area from the end of the QRS complex to the beginning of the T wave.
Learn more about ST segment in ECG here:
