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
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.
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Related Questions
Correct Answer is B
Explanation
A. Elevated erythrocyte sedimentation rate (ESR): Elevated ESR indicates inflammation in the body and is not typically associated with the cause of atrial fibrillation.
B. Elevated thyroid-stimulating hormone (TSH): This is the correct answer. A common cause of atrial fibrillation is hyperthyroidism, which is characterized by an overactive thyroid gland and often presents with elevated TSH levels. Thyroid hormones play a significant role in regulating heart rate and rhythm. Excess thyroid hormone can lead to increased heart rate and irregular heart rhythms, including atrial fibrillation.
C. Elevated brain natriuretic peptide (BNP): Elevated BNP levels are associated with heart failure and may indicate cardiac stress or dysfunction. While heart failure can predispose individuals to atrial fibrillation, elevated BNP levels themselves are not a direct cause of atrial fibrillation.
D. Elevated C-reactive protein (CRP): Elevated CRP levels indicate inflammation in the body and are associated with various cardiovascular diseases. While inflammation can contribute to atrial fibrillation, elevated CRP levels alone are not a direct cause of atrial fibrillation.
Correct Answer is C
Explanation
A. Consume foods high in potassium: Potassium deficiency can contribute to certain health issues, but it is not directly linked to hearing loss. However, maintaining a balanced diet rich in nutrients, including potassium, is important for overall health.
B. Increase oral intake of water: Hydration is essential for overall health, but increasing oral intake of water is not specifically associated with decreasing the risk of hearing loss. While staying hydrated is beneficial for various bodily functions, including maintaining proper ear function, it is not a direct preventive measure for hearing loss.
C. Avoid smoking tobacco products: Smoking tobacco products is a significant risk factor for developing hearing loss. Smoking can damage blood vessels and reduce blood flow to the inner ear, leading to hearing impairment. Therefore, advising clients to avoid smoking or quit smoking is an important lifestyle modification to decrease the risk of hearing loss.
D. Limit alcohol to two drinks daily: Excessive alcohol consumption can have detrimental effects on hearing health, including increasing the risk of hearing loss and vestibular dysfunction. Therefore, limiting alcohol intake is recommended to reduce the risk of developing hearing-related problems.
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