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

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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Correct Answer is B

Explanation

A. "It usually takes at least 2 to 3 days for heparin to dissolve a clot." Heparin does not dissolve clots; it prevents the formation of new clots and stops existing clots from growing.

B. "Heparin prevents new clots from forming rather than dissolving established clots." Heparin's role is to prevent new clots from forming, not to dissolve existing clots. The body's natural fibrinolytic system will eventually break down the clot.

C. "The time it takes for heparin to dissolve a clot depends on the size of the clot." This is incorrect because heparin does not dissolve clots, regardless of their size.

D. "The time it takes heparin to dissolve clots varies between clients." This is incorrect as well, as heparin does not dissolve clots at all.

A. Measure the client's ankle circumference. B. Measure from the client's heel to the gluteal fold. C. Measure from the client's heel to the popliteal space. D. Measure the length of the client's feet.

Correct Answer is C

Explanation

A. Measure the client's ankle circumference. This is a correct action, as the ankle circumference is necessary to ensure that the stockings fit snugly and provide the proper amount of compression to prevent venous stasis.

B. Measure from the client's heel to the gluteal fold. This measurement would be appropriate for thigh-high stockings, not knee-high stockings.

C. Measure from the client's heel to the popliteal space. For knee-high stockings, measuring from the heel to the popliteal space (behind the knee) ensures the stockings fit properly without cutting off circulation or causing discomfort.

D. Measure the length of the client's feet. Foot length is not necessary for knee-high stockings, as their primary function is to apply compression from the ankle to the knee.

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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?

Nursing Test Bank

Naxlex Comprehensive Predictor Exams

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