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","C","E"]
Explanation
A. Crackles are more commonly associated with left ventricular failure, which leads to pulmonary congestion.
B. Hepatomegaly, or an enlarged liver, is a sign of right ventricular failure due to blood backing up in the systemic circulation.
C. Jugular venous distention is a classic sign of right ventricular failure as blood accumulates in the venous system.
D. Orthopnea, or difficulty breathing while lying down, is more indicative of left ventricular failure.
E. Peripheral edema is a hallmark of right ventricular failure, resulting from increased venous pressure.
Correct Answer is A
Explanation
A. Clustering nursing activities helps to minimize interruptions, allowing the patient to have longer periods of uninterrupted rest, which is essential for recovery and reducing sensory disturbances from sleep deprivation.
B. Silencing alarms could compromise patient safety and is not recommended.
C. Administering sedatives or opioids should be done cautiously and is not a first-line approach for promoting sleep, especially if non-pharmacological methods can be effective.
D. While reducing nighttime assessments may help with sleep, it is not always feasible and should be balanced with the need for monitoring the patient’s condition.
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