As a medical professional with expertise in cardiology, I can provide you with the typical characteristics on an ECG that indicate myocardial ischemia:


1. ST-segment depression: This is one of the most common signs of ischemia. It occurs when the ST segment is depressed below the baseline, indicating a disruption in the normal supply of blood to the heart muscle.


2. T-wave inversion: Deep, symmetrical T-wave inversions, particularly in leads that are facing the affected area of the heart, can suggest ischemia.


3. Q-wave abnormalities: The presence of new or significant Q waves can indicate a previous or current ischemic event.


4. ST-segment elevation: This is a critical sign of acute myocardial infarction (heart attack) and represents a more severe form of ischemia.


5. Prolonged QT interval: Although not as specific for ischemia, a prolonged QT interval can sometimes be associated with myocardial ischemia, especially in the context of certain medications or electrolyte imbalances.


6. Upsloping ST depression: A subtle but important sign, this occurs when the ST segment slopes downward and then upward, which can be indicative of ischemia.

7.
Dynamic changes: Ischemia can cause changes in the ECG that evolve over time, such as the development or resolution of ST-segment changes or T-wave inversions.

8.
Arrhythmias: Certain arrhythmias, like atrial fibrillation or ventricular premature beats, can be associated with ischemia, particularly if they are new or more frequent.

Remember, the interpretation of an ECG should be done in the context of the patient's clinical presentation and history. It's also important to compare with previous ECGs if available.

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The ECG sign of subendocardial ischemia is ST segment depression (A). Depression is reversible if ischemia is only transient but depression persists if ischemia is severe enough to produce infarction. T wave inversion with or without ST segment depression (B) is sometimes seen but not ST segment elevation or Q wave.read more >>