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 C
Explanation
This is because varicella, or chickenpox, is a highly contagious disease caused by the varicellazoster virus (VZV), which can spread through the air or by direct contact with the fluid from the blisters. A negative air pressure room prevents the air from the room from circulating to other areas of the hospital, reducing the risk of transmission to other patients and staff.
Choice A is wrong because aspirin should not be given to children with chickenpox, as it can cause a serious condition called Reye’s syndrome, which affects the brain and liver. Instead, acetaminophen can be used to reduce fever.
Choice B is wrong because droplet precautions are not enough to prevent the spread of chickenpox. Droplet precautions involve wearing a mask and gloves when in close contact with the patient, but they do not prevent the virus from traveling through the air. Airborne precautions, which include a negative air pressure room and wearing a respirator, are needed for chickenpox.
Choice D is wrong because Koplik spots are not a sign of chickenpox, but of measles, another viral infection that causes a rash. Chickenpox causes an itchy rash with small, fluid-filled blisters that crust over.
Correct Answer is A
Explanation
The correct answer is choice A. The nurse should ensure the state health department has been notified of the child’s Lyme disease, as it is a reportable disease in most states.
Reporting helps to monitor the incidence and prevalence of Lyme disease and to implement prevention and control measures.
Choice B is wrong because antitoxin is not used to treat Lyme disease.
Antitoxin is a substance that neutralizes the effects of a toxin, such as botulism or tetanus. Lyme disease is caused by a bacterium called Borrelia burgdorferi, which can be treated with antibiotics.
Choice C is wrong because Lyme disease is not transmitted by sharing personal belongings. Lyme disease is spread to humans by the bite of infected ticks that carry the
bacterium. The risk of getting Lyme disease can be reduced by avoiding tick-infested areas, wearing protective clothing, using insect repellent, and removing ticks promptly.
Choice D is wrong because skin necrosis is not a common complication of Lyme disease.
Skin necrosis is the death of skin tissue due to lack of blood supply or infection. Lyme disease can cause a characteristic skin rash called erythema migrans, which is usually circular or oval and expands over time. Other possible signs and symptoms of Lyme disease include fever, headache, fatigue, joint pain, and neurological problems.
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