i mean the patterns like ST elevation/depression and hyperacute T wave and abnormal Q wave.
In order for a patient to be diagnosed with a myocardial infarction, they must have at least two of the following three criteria, according to the World Health Organization:
Clinical history of chest discomfort consistent with ischemia, such as crushing chest pain
An elevation of cardiac markers in blood (Troponin-I, CK-MB, Myoglobin)
Characteristic changes on electrocardiographic tracings taken serially
As to the last point, comparing the patient’s current ECG within old ECG is an important part of diagnosis. On the other hand, particularly worrisome changes by ECG should still be treated presumptively if the prior ECG is not available.
What i surveyed the literature, Events in chronological order in MI are,
1) On the 1st day the ST segment will be elevated with upright T-wave but no Q-wave.
2) Over the next two days the T-wave will slowly become inverted and the ST segment is still raised.
3) Towards the end of the 1st week the ST-segment will be returning to the base level. The T-wave will be deeply inverted and the Q-wave starts appearing.
4) In the 3rd week the Q-wave will become fully developed and the T-wave will gradually become flat and start returning ti the normal.
5) By the end of the 3 months the ST segment and T-wave will return to normal and only the Q-wave will remain permanent.
If the size of the infarct is very small , the Q-wave may completely disappear.
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