Non-Q wave myocardial infarction (NQWMI)

A non-Q wave myocardial infarction refers to a myocardial infarction that does not result in a Q wave on the 12-lead ECG once the infarction is completed. It was once believed that the development of Q waves indicated that the infarction was “transmural” involving the full thickness of the myocardium, however autopsy studies failed to confirm this. The terms Q wave MI, non-Q wave MI, transmural MI and non-transmural MI are no longer recommended for use. Instead, acute coronary syndromes are classified as unstable angina, non-ST elevation myocardial infarction and ST elevation myocardial infarction.