A nurse is obtaining the history of a patient who reveals that he had an MI 5 years ago. When the admission 12-lead ECG is reviewed, Q waves are noted in leads V3 and V4 only. Which of the following conclusions is most consistent with this situation?
a. The patient may have had a posterior wall MI.
b. The patient must have had a right ventricular MI.
c. The admission 12-lead ECG was done incorrectly.
d. The patient may have had an anterior MI.
D
Not every acute myocardial infarction (MI) results in a pathologic Q wave on the 12-lead electrocardiogram (ECG). When the typical ECG changes are not present, the diagnosis depends on symptomatic clinical presentation, specific cardiac biomarkers (e.g., cTnI, cTnT, CK-MB), and non-ECG diagnostic tests such as cardiac catheterization. Anterior and posterior wall MIs have ST changes, not Q wave changes.
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