A nurse is collecting data for a client who experienced a myocardial infarction prior to a cardiac arrest. Which of the following laboratory tests will identify early injury to the cardiac muscle?
Creatine kinase-myocardial band (CK-MB) test
Troponin T test
Brain natriuretic peptide (BNP) test
Creatine kinase (CK) test
The Correct Answer is B
A. Creatine kinase-myocardial band (CK-MB) test: While CK-MB is also a marker of myocardial injury, it is less specific than troponin and can be elevated in other conditions, such as muscle injury.
B. Troponin T test. The Troponin T test is highly specific and sensitive for myocardial injury and is considered the gold standard for diagnosing a myocardial infarction. Troponin levels rise within hours of cardiac muscle injury and remain elevated for days, providing an early and reliable indicator of cardiac muscle damage.
C. Brain natriuretic peptide (BNP) test. BNP levels are used to assess heart failure and do not indicate acute cardiac muscle injury.
D. Creatine kinase (CK) test. CK measures overall muscle injury, not specific to cardiac muscle.
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Correct Answer is C
Explanation
A. "A heart murmur is a high-pitched sound due to a narrow valve." Not all murmurs are high-pitched, nor are they always due to a narrow valve.
B. "This means that there is some inflammation around your heart." A murmur does not indicate inflammation around the heart; it typically indicates abnormal blood flow.
C. "This indicates turbulent blood flow through a valve." A heart murmur is caused by turbulent blood flow, often through a damaged or abnormal valve.
D. "A heart murmur is an extra sound due to blood entering an inflexible chamber." While inflexible chambers can cause extra heart sounds, this does not describe a murmur.
Correct Answer is C
Explanation
A. Calcium 10 mg/dL: This calcium level is within the normal range (8.6-10.2 mg/dL) and does not require intervention.
B. Sodium 136 mEq/L: This sodium level is within the normal range (135-145 mEq/L).
C. Potassium 2.3 mEq/L: This potassium level is critically low; bumetanide is a loop diuretic that can cause hypokalemia, which can lead to dangerous cardiac dysrhythmias.
D. Magnesium 1.4 mEq/L: While slightly low, this magnesium level is only mildly decreased and not as immediately concerning as the potassium level.