A patient is admitted through the emergency room with an acute MI. Upon review of the diagnostic testing results, the nurse would expect to see:
A) Elevated CK isoenzymes, ie, CK-MB
B) ECG changes at onset of chest pain
C) Decrease in myoglobin protein
D) Enlarged heart seen on echocardiogram
Ans: A
Feedback: CK-MB is a tissue enzyme that is specific to cardiac muscle and is released into the blood when myocardial cells die. An increase in myoglobin is not very specific in indicating an acute cardiac event; however, negative results are an excellent parameter for ruling out an acute MI because infarction evolves over time. The ECG also changes over time and may not show changes at the onset of pain. An enlarged heart indicates cardiac stress but is not diagnostic of an acute MI.
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