Hypoxia and Medicine

How is ST elevation/depression measured? How much indicates cardiac ischemia?

When doing EKG monitoring, how much ST depression or elevation indicates that the myocardium is ischemic?

Public Comments

1. ST elevation / depression is measured with respect to the TP segment. 1 mm ST elevation and 0.5 mm ST depression are significant.
2. 1mm of elevation
3. Not all ST elevation / depression is indicated cardiac ischemia. Some people when taking a medication or counter drugs can cause that too. Like my case wpw syndrome is always associated with ST elevation / depression. The ECG print out can show "possibly acute inferior myocardial Infarction" as well. But I'm not in cardiac ischemia.