Which electrocardiographic change would the emergency department nurse expect to observe in a patient experiencing subendocardial cardiac injury?
A) ST-segment elevation
B) ST-segment depression
C) Shortened PR interval
D) Prolonged PR interval
B) ST-segment depression
Explanation: A) Transmural (epicardial) injury extends from the endocardium to epicardium and is characterized by ST-segment elevation.
B) Subendocardial injury is characterized by ST-segment depression.
C) A shortened PR interval is not an indication of ischemia.
D) A prolonged PR interval is not an indication of ischemia.
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