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.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Use the diaphragm of the stethoscope to listen to the carotid pulsations. The apical pulse is located at the apex of the heart, not at the carotid artery. This option does not describe the correct location or use of the stethoscope.
B. Count the apical pulsations for a full minute. Counting for a full minute is the correct method for assessing an apical pulse, particularly in clients on cardiovascular medications, to ensure accurate detection of any irregularities.
C. Check the apical pulse with a Doppler device. A Doppler device is typically used to assess peripheral pulses, not the apical pulse. A stethoscope is the appropriate tool for apical pulse assessment.
D. Press the stethoscope firmly against the client's skin. While the stethoscope should be placed firmly enough to hear heart sounds, excessive pressure can distort the sounds and is not necessary.
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.
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