The nurse has received the laboratory results for a patient who developed chest pain 4 hours ago and may be having a myocardial infarction. Which laboratory test result should be most helpful in indicating myocardial infarction?
Creatine kinase-MB (CK-MB)
B-type natriuretic peptide (BNP)
Myoglobin
Troponin
The Correct Answer is D
A. CK-MB is a cardiac enzyme that rises in response to myocardial injury, but it is less specific and takes longer to rise than troponin.
B. BNP is associated with heart failure, not myocardial infarction.
C. Myoglobin is an early marker but is non-specific, as it rises with any muscle damage.
D. Troponin is the most specific and sensitive biomarker for myocardial infarction. It rises within 3-4 hours after myocardial injury and remains elevated for days, making it the most useful test for confirming an MI.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. While a CVP catheter might be in place for an extended period, its purpose is not directly related to heart healing.
B. The CVP catheter is used to monitor central venous pressure, which helps guide fluid management and assess right heart function.
C. The CVP catheter does not extend into the left ventricle; it is typically positioned in the superior vena cava or right atrium.
D. The CVP catheter may have multiple lumens for administering fluids, but its primary purpose is hemodynamic monitoring, not just providing IV access.
Correct Answer is B
Explanation
A. Obtaining a stat chest x-ray is important if catheter misplacement is suspected, but in this situation, ensuring the accuracy of the pressure reading through proper leveling and zeroing is the priority.
B. Zero referencing and leveling the catheter at the phlebostatic axis is essential to ensure accurate readings of the pulmonary artery pressure, which is critical for patient assessment and management.
C. Increasing supplemental oxygen is unnecessary given the patient’s stable oxygen saturation and normal respiratory status.
D. While notifying the provider is important, ensuring the accuracy of the pressure reading by leveling and zeroing the catheter should be done first.
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