A nurse is reviewing the laboratory findings of a client who experienced an acute myocardial infarction 6 days ago. Which of the following laboratory values should the nurse expect to remain elevated at this time?
Troponin T
Creatinine phosphokinase
Myoglobin
Creatinine kinase-MB
The Correct Answer is A
A. Troponin T: Troponin T remains elevated for 10 to 14 days after a myocardial infarction. This protein is highly specific for cardiac muscle injury and is used to confirm myocardial infarction.
B. Creatinine phosphokinase: Creatinine phosphokinase (CPK) typically returns to normal levels within 3 days after a myocardial infarction, so it would no longer be elevated at this point.
C. Myoglobin: Myoglobin rises early after a myocardial infarction but is not specific to heart muscle and returns to normal within 24 hours, so it would not be elevated at this time.
D. Creatinine kinase-MB: Creatinine kinase-MB (CK-MB) usually returns to normal levels within 2 to 3 days after a myocardial infarction, so it is unlikely to still be elevated 6 days later.
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Related Questions
Correct Answer is A
Explanation
A. Troponin T: Troponin T remains elevated for 10 to 14 days after a myocardial infarction. This protein is highly specific for cardiac muscle injury and is used to confirm myocardial infarction.
B. Creatinine phosphokinase: Creatinine phosphokinase (CPK) typically returns to normal levels within 3 days after a myocardial infarction, so it would no longer be elevated at this point.
C. Myoglobin: Myoglobin rises early after a myocardial infarction but is not specific to heart muscle and returns to normal within 24 hours, so it would not be elevated at this time.
D. Creatinine kinase-MB: Creatinine kinase-MB (CK-MB) usually returns to normal levels within 2 to 3 days after a myocardial infarction, so it is unlikely to still be elevated 6 days later.
Correct Answer is D
Explanation
A. Tell the client to take another nitroglycerin tablet in 15 minutes. Nitroglycerin can be taken every 5 minutes, up to three doses, for chest pain. Waiting 15 minutes to take another dose is too long and can delay necessary treatment.
B. Advise the client to take an antacid. Antacids are not appropriate for managing chest pain that may be related to angina or a myocardial infarction. This response may delay critical treatment.
C. Advise the client to come into the office. This would delay care in a potential emergency situation. If the client is experiencing unrelieved chest pain after taking nitroglycerin, immediate emergency care is necessary.
D. Instruct the client to call 911. Chest pain unrelieved by nitroglycerin is a sign of a possible myocardial infarction, which is a medical emergency. The client should call 911 immediately to receive urgent care.
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