![]() An elevation of cardiac markers in blood (Troponin-I, CK-MB, Myoglobin).Clinical history of chest discomfort consistent with ischemia, such as crushing chest pain.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: This is because ST segment elevation myocardial infarction is almost always associated with a pathological Q wave. ![]() Occasionally, non-ST segment elevation myocardial infarction is referred to as non-Q wave myocardial infarction and STEMI is referred to as Q wave myocardial infarction. ![]() Specifically, an acute coronary syndrome includes unstable angina, non-ST segment elevation myocardial infarction, and ST segment elevation myocardial infarction (STEMI). For the purposes of this learning module, we will assume that all changes are new for the patient and thus represent an acute myocardial infarction.Īn acute coronary syndrome may include various clinical entities that involve some sort of ischemia or infarction. One of the complications with using ECG for myocardial infarction diagnosis is that it is sometimes difficult to determine which changes are new and which are old. ![]() Diagnosing an acute myocardial infarction by ECG is an important skill for healthcare professionals, mostly because of the stakes involved for the patient. ![]()
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