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 A
Explanation
A. Numbness and tingling in the left hand could indicate compromised blood flow or nerve damage, potentially due to the arterial line, requiring immediate assessment and intervention.
B. Slight bloody drainage is a common finding and typically does not require immediate action.
C. A dressing beginning to lift should be addressed to maintain a sterile environment but is not an emergency.
D. Slight redness at the insertion site may indicate mild irritation or early signs of infection, but it does not require immediate intervention compared to the potential vascular or nerve compromise suggested by numbness and tingling.
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.
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