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 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.
Correct Answer is B
Explanation
A. Suggest that the client rests before eating the meal. Although rest can help with nausea, it does not address the potential issue of digoxin toxicity, which can cause nausea.
B. Check the client's vital signs. Checking vital signs, especially heart rate, is the priority because nausea can indicate digoxin toxicity, which affects heart function.
C. Request a dietary consult. A dietary consult may be helpful if the client continues to refuse meals, but it does not address the immediate potential for digoxin toxicity.
D. Request an order for an antiemetic. Although an antiemetic may help with nausea, assessing for toxicity takes priority.