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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?

A.

Troponin T

B.

Creatinine phosphokinase

C.

Myoglobin

D.

Creatinine kinase-MB

Answer and Explanation

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 C

Explanation

A. Eggs: Eggs, particularly the yolks, are high in cholesterol and should be limited in a low-cholesterol diet.

B. Milk: Full-fat milk is high in saturated fat and cholesterol. If the client consumes milk, it should be low-fat or non-fat varieties.

C. Beans: Beans are high in fiber and low in fat and cholesterol. They are an excellent choice for a low-cholesterol diet.

D. Liver: Liver is high in cholesterol and should be avoided by clients following a low-cholesterol diet.

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.

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