The nurse suspects that a patient experienced a transmural myocardial infarction. What electrocardiogram finding did the nurse use to make this clinical decision?
1. Q wave deepening
2. ST segment elevation
3. ST segment depression
4. P wave inversion
Correct Answer: 1
A significant Q wave develops with a transmural infarction, so this also may be called a Q-wave MI. ST segment elevation represents myocardial ischemia, which is reversible by increasing the blood flow to the heart. ST segment depression occurs when muscle ischemia involves only a portion of the heart wall. P wave inversion represents a junctional pacemaker in the heart and is not related to changes that occur with a myocardial infarction.
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