A nurse is providing care 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 (CK) test
Creatine kinase-myocardial band (CK-MB) test
Brain natriuretic peptide (BNP) test
Troponin T test
The Correct Answer is D
Answer: D. Troponin T test
Rationale:
A. Creatine kinase (CK) test: While creatine kinase isoenzymes, including CK-MB, can be elevated following myocardial infarction (MI), they are not specific to cardiac muscle injury. CK is found in various tissues throughout the body, so elevated levels can also indicate damage to skeletal muscle or brain tissue, among other sources.
B. Creatine kinase-myocardial band (CK-MB) test: CK-MB is a cardiac-specific isoform of creatine kinase, and elevated levels can indicate myocardial injury, particularly in the context of an acute MI. However, troponin T is a more sensitive and specific marker for myocardial injury.
C. Brain natriuretic peptide (BNP) test: Brain natriuretic peptide is primarily used in the diagnosis and management of heart failure. While elevated BNP levels can indicate heart muscle strain or stress, they are not specific markers for acute myocardial infarction or early injury to the cardiac muscle.
D. Troponin T test: This is the correct answer. Troponin T is a highly specific marker for cardiac muscle injury. Elevated troponin levels can be detected within hours of myocardial infarction and persist for several days, making it an essential tool in the diagnosis of acute coronary syndromes, including myocardial infarction. Troponin T is considered one of the gold standard biomarkers for detecting early injury to the cardiac muscle.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
The correct answer is D. Remind the client to use the incentive spirometer.
Choice A rationale:
Observing the position of the suspended weight is beyond the scope of practice for assistive personnel (AP). This task requires assessment skills to ensure proper alignment and functioning of the traction system, which is the responsibility of the nurse.
Choice B rationale:
Checking the client’s pedal pulse on the right leg involves assessment and clinical judgment to evaluate perfusion and detect potential complications such as impaired circulation. This is not a task that can be delegated to AP.
Choice C rationale:
Asking the client to describe her pain requires assessment and interpretation of subjective data, which falls under the nurse's scope of practice. Pain assessment is a critical nursing function.
Choice D rationale:
Reminding the client to use the incentive spirometer is a non-assessment task that involves reinforcing previously taught instructions. This is appropriate to delegate to assistive personnel, as it does not require clinical judgment.
Correct Answer is A
Explanation
Choice A reason:
Eating 1 g/kg of protein per day is the appropriate recommendation. When providing discharge teaching to a client with chronic kidney disease (CKD) who is receiving haemodialysis, the nurse should include the instruction to eat an appropriate amount of protein, which is usually recommended at a specific daily intake based on the client's weight.
Clients with CKD often have dietary restrictions, including limiting protein intake to reduce the workload on the kidneys. However, protein intake is still necessary for maintaining muscle mass and overall health. The recommended protein intake for clients with CKD undergoing haemodialysis is typically around 1 gram of protein per kilogram of body weight per day.
Choice B reason:
Drink at least 3 L of fluid daily. Clients receiving haemodialysis typically have fluid restrictions, as impaired kidney function can lead to fluid retention and electrolyte imbalances. The specific fluid allowance will be determined by the healthcare provider based on the client's individual needs, and it may be significantly less than 3 L per day.
Choice Doption
Take magnesium hydroxide for ingestion. Magnesium hydroxide is a laxative and antacid used to relieve constipation and heartburn. It is not typically prescribed for clients with chronic kidney disease, especially without proper evaluation of their kidney function and overall medical condition.
Choice Coption:
C. Consume foods high in potassium.
Clients with chronic kidney disease, especially that undergoing haemodialysis, often need to restrict potassium intake. Impaired kidney function can lead to the build-up of potassium in the blood, which can be harmful. Therefore, it is essential for clients with CKD to avoid or limit foods high in potassium.

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