The nurse is caring for a patient admitted with unstable angina. The laboratory result for the initial troponin I is elevated in this patient. The nurse recognizes what?
A) This is only an accurate indicator of myocardial damage when it reaches its peak in 24 hours.
B) Because the entry diagnosis is unstable angina, this is a poor indicator of myocardial injury.
C) This is an accurate indicator of myocardial injury.
D) It is only an accurate indicator of skeletal muscle injury.
Ans: C
Feedback: Troponin I is specific to cardiac muscle and is elevated within 3 to 4 hours after myocardial injury. Options A, B, and D are incorrect. Even with a diagnosis of unstable angina, this is an accurate indicator of myocardial injury.
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