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 A
Explanation
Correct Answer is A
Explanation
The correct answer is A.
Weight loss.
Furosemide is a loop diuretic that is used to treat fluid volume excess by increasing the excretion of water and electrolytes through the kidneys. Weight loss is an indication that the medication has been effective in reducing the excess fluid in the body.
Choice B is wrong because decreased inflammation is not a direct effect of furosemide.
Inflammation is a response to tissue injury or infection, and furosemide does not have any anti-inflammatory properties.
Choice C is wrong because increased blood pressure is not an indication of furosemide effectiveness.
Furosemide lowers blood pressure by reducing the preload and afterload on the heart.
Increased blood pressure may indicate that the dose of furosemide is insufficient or that there are other factors contributing to hypertension.
Choice D is wrong because decreased pain is not an expected outcome of furosemide therapy.
Furosemide does not have any analgesic effects, and pain may be caused by various conditions that are not related to fluid volume excess.
Normal ranges for weight, blood pressure and pain vary depending on the individual patient’s baseline and goals.
However, some general guidelines are:
- Weight: A weight loss of 0.5 to 1 kg per day is considered safe and effective for patients with fluid volume excess.
- Blood pressure: The target blood pressure for most patients with heart failure is less than 130/80 mmHg.
- Pain: The pain level should be assessed using a valid and reliable scale, such as the numeric rating scale or the visual analogue scale, and treated according to the patient’s preference and tolerance.
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