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

Answer and Explanation

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.

A. Barrel chest B. Bradycardia C. Clubbing of the fingers D. Heart murmur

Correct Answer is D

Explanation

A. Barrel chest. A barrel chest is commonly seen in chronic obstructive pulmonary disease (COPD) rather than mitral valve stenosis.

B. Bradycardia. Bradycardia is not typically associated with mitral valve stenosis, as symptoms often include rapid or irregular heartbeat.

C. Clubbing of the fingers. Clubbing is associated with chronic hypoxia, often due to pulmonary conditions, not specifically with mitral valve stenosis.

D. Heart murmur. Mitral valve stenosis causes turbulent blood flow through the narrowed valve, resulting in a characteristic murmur.

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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?

Nursing Test Bank

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