A nurse is reviewing the laboratory values of a client who had a myocardial infarction 3 hr ago. The nurse should expect which of the following laboratory values to be elevated?
Serum amylase
Unconjugated bilirubin
Aspartate aminotransferase (AST).
Troponin I
The Correct Answer is D
A. Serum amylase: Serum amylase is an enzyme associated with pancreatic function, and its elevation is not specific to myocardial infarction.
B. Unconjugated bilirubin: Elevation of unconjugated bilirubin is associated with liver function and hemolysis, not specifically with myocardial infarction.
C. Aspartate aminotransferase (AST): While AST may be elevated in conditions affecting the heart, it is not as specific or sensitive for myocardial infarction as troponin I.
D. Troponin I: This is the correct answer. Troponin I is a cardiac-specific biomarker released into the bloodstream when there is damage to cardiac muscle, such as during a myocardial infarction. Troponin I levels start to rise within 3-4 hours after the onset of myocardial infarction, making it a crucial marker for early detection.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Smoking cessation: Chronic bronchitis is often associated with smoking and exposure to tobacco smoke. The most effective preventive measure for chronic bronchitis is to quit smoking and avoid exposure to secondhand smoke. Smoking cessation not only prevents chronic bronchitis but also improves overall respiratory health.
B. Regular moderate exercise: While regular exercise is beneficial for overall health, it is not specifically cited as a primary preventive measure for chronic bronchitis. However, exercise can contribute to overall respiratory health and well-being.
C. Maintenance of ideal weight: Maintaining an ideal weight is important for overall health, but it is not identified as a specific preventive measure for chronic bronchitis.
D. Annual influenza immunization: Influenza immunization is important for preventing influenza (flu) and its complications. While individuals with chronic bronchitis may be at increased risk for respiratory infections, annual influenza immunization is not a direct preventive measure for chronic bronchitis itself.
Correct Answer is D
Explanation
A. A friction rub:A friction rub is a sound caused by the rubbing of inflamed pericardial layers and is not classified as a heart sound like S1 or S2. It is unrelated to the sequence of heart sounds.
B. A split second heart sound S₂:A split S₂ occurs during the closure of the aortic and pulmonary valves and is heard after S1, not before.
C. The third heart sound (S3):S3, or the ventricular gallop, occurs shortly after S2 during early diastole and indicates rapid ventricular filling. It is not heard before S1.
D. The fourth heart sound (S4):S4, known as the "atrial gallop," occurs just before S1 during atrial contraction. It is associated with a stiff or hypertrophied ventricle and is often indicative of underlying heart disease, especially in older adults.
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