Practice Question
A nurse is caring for a client with a possible acute myocardial infarction (AMI). The electrocardiogram (ECG) shows no ST segment elevations or depression. The nurse is aware that an elevation of which lab result will determine if there has been cardiac injury?
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Correct Answer:
Elevated Troponins
Rationale:
🔹Troponins (I and T) are the most sensitive and specific biomarkers for diagnosing acute myocardial infarction (AMI).
🔹 They begin to rise within 3–6 hours after cardiac muscle injury and can remain elevated for 10–14 days, making them ideal for detecting both recent and ongoing damage.
🔹An ECG without ST segment changes does not rule out AMI, particularly in non-ST-elevation myocardial infarction (NSTEMI).
🔹 In such cases, elevated troponins confirm myocardial injury. CK is less specific to the heart, hemoglobin reflects oxygen-carrying capacity, and B-type Natriuretic Peptide (BNP) is used to assess heart failure, not myocardial infarction.
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This question is from RN ATI NSG232 which contains 40 questions.
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Question Details
- Category: RN Nursing Exam(s)
- Subcategory: ATI Exam(s)
- Domain: RN ATI MedSurg
- Answer Choices: 4