What does ST elevation on an ECG indicate?

ST elevation on an ECG signifies the presence of acute myocardial injury, particularly in the context of myocardial infarction. This elevation reflects the ongoing damage to the cardiac tissue caused by a lack of blood supply, which leads to cellular injury. The distinct elevation of the ST segment indicates that the heart muscle is not only under stress but is experiencing significant trauma, which may evolve into a full-thickness myocardial infarction if not promptly addressed.

While ischemia may be associated with other ECG changes such as ST depression or T-wave inversions, ST elevation specifically points to injury. Normal heart function would not present with ST segment alterations. Thus, recognizing ST elevation on an ECG is critical for the rapid assessment and treatment of patients with suspected myocardial infarction, marking it as a potential emergency requiring immediate intervention.