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 B
Explanation
A hematoma is a collection of blood outside a blood vessel that can cause swelling, pain, and bruising. It can indicate bleeding from the artery where the catheter was inserted, which can be a serious complication of cardiac catheterization.
The nurse should notify the provider immediately if a hematoma is observed.
Choice A is wrong because heart rate 90/min is within the normal range for adults and does not indicate a complication.
Choice C is wrong because bounding pulses in the affected extremity are expected after cardiac catheterization, as they indicate good blood flow to the area.
Choice D is wrong because report of discomfort at the insertion site is common and usually mild after cardiac catheterization.
The nurse can provide pain relief as needed, but does not need to notify the provider unless the pain is severe or persistent.
Normal ranges for heart rate are 60-100 beats per minute for adults. Normal ranges for blood pressure are 120/80 mmHg or lower for systolic pressure and 80 mmHg or lower for diastolic pressure. Normal ranges for oxygen saturation are 95-100% for adults.
Correct Answer is B
Explanation
Choice A reason
Administering naloxone to the newborn is not appropriate. Naloxone is an opioid antagonist used to reverse the effects of opioid overdose in adults. It is not typically used for newborns with neonatal abstinence syndrome. The management of NAS is primarily supportive, and medications may be prescribed to help manage specific withdrawal symptoms, but naloxone is not a standard treatment for NAS.
Choice B reason:
Minimizing noise in the newborn's environment is a crucial action in the plan of care is the correct action to be included. Newborns experiencing NAS can be easily overstimulated, and loud noises can exacerbate their withdrawal symptoms and distress. Creating a calm and quiet environment helps reduce agitation and promotes better sleep and overall comfort.
Choice C reason
Swaddling the newborn with his leg extended is not appropriate in this case. Swaddling can be beneficial for some newborns, but the specific positioning and swaddling techniques should be individualized based on the newborn's needs and preferences. Extending the newborn's legs may not necessarily be the best approach, as it may not provide comfort or address the symptoms associated with NAS.
Choice D reason:
Maintaining eye contact with the newborn during feedings is not appropriate in this case. While maintaining eye contact during feedings is an essential aspect of bonding and promoting parent-newborn attachment, it may not be the primary focus in managing neonatal abstinence syndrome. The plan of care for a newborn with NAS would primarily involve managing withdrawal symptoms, providing comfort measures, and addressing the newborn's unique needs during this challenging period.
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