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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?

A.

Creatine kinase-myocardial band (CK-MB) test

B.

Troponin T test

C.

Brain natriuretic peptide (BNP) test

D.

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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View Related questions

Correct Answer is B

Explanation

A. Fatigue. Fatigue can be a common symptom of various health conditions, including heart disease, and is not specific to pacemaker malfunction.

B. Rapid pulse. A rapid pulse or palpitations may signal a malfunction where the pacemaker is pacing too quickly or erratically.

C. Increased urine output. Increased urine output is not related to pacemaker function and does not indicate a malfunction.

D. Sneezing. Sneezing is unrelated to pacemaker malfunction and does not warrant provider notification.

Correct Answer is B

Explanation

A. Bounding peripheral pulses: Hypokalemia typically causes weak, thready pulses rather than bounding ones.

B. Decreased deep-tendon reflexes: Hypokalemia can cause muscle weakness and decreased deep-tendon reflexes due to impaired neuromuscular function.

C. Hyperactive bowel sounds: Hypokalemia generally causes decreased or hypoactive bowel sounds due to slowed smooth muscle contraction.

D. Restlessness: Restlessness is not a typical sign of hypokalemia; hypokalemia more commonly causes weakness, lethargy, or fatigue.

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