In ECG, ST segment is elevated in

Options

A. Acute myocardial infarction
B. Myocardial ischaemia
C. Insufficient supply of oxygen to the heart muscles
D. Both (2) & (3)

Answer

**Step-by-Step Solution:**

1. **Understanding ECG and ST Segment**: The electrocardiogram (ECG) is a test that measures the electrical activity of the heart. The ST segment is a specific part of the ECG waveform that represents the interval between ventricular depolarization and repolarization.

2. **Identifying Conditions Related to ST Segment Elevation**: The ST segment can be elevated in certain medical conditions. The most notable conditions include acute myocardial infarction (heart attack) and myocardial ischemia.

3. **Acute Myocardial Infarction**: This condition occurs when there is a blockage in the coronary arteries, leading to insufficient blood flow and oxygen supply to the heart muscle. This blockage can cause damage to the heart tissue, which is reflected in the elevation of the ST segment on the ECG.

4. **Myocardial Ischemia**: This condition refers to a reduction in blood flow to the heart muscle, often due to coronary artery obstruction. Similar to a heart attack, this insufficient blood supply can also lead to ST segment elevation.

5. **Conclusion**: In summary, the ST segment is elevated in conditions such as acute myocardial infarction and myocardial ischemia, both of which are related to insufficient oxygen supply to the heart muscle due to coronary artery obstruction.

**Final Answer**: The ST segment is elevated in acute myocardial infarction and myocardial ischemia.

---