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. Cheyne-Stokes respirations: Cheyne-Stokes respirations are characterized by alternating periods of hyperventilation followed by apnea. This respiratory pattern is often observed in clients with conditions affecting the central nervous system, such as brain injury or stroke.
B. Apneustic respirations: Apneustic respirations are characterized by prolonged, gasping inhalations followed by extremely short, ineffective exhalations. This pattern is associated with damage to the pons, a part of the brainstem.
C. Stridor: Stridor is a high-pitched, noisy breathing sound caused by turbulent airflow through a partially obstructed airway. It is not related to the described alternating pattern of hyperventilation and apnea.
D. Kussmaul respirations: Kussmaul respirations are deep, rapid respirations often seen in metabolic acidosis. They are not characterized by the alternating pattern described in the scenario.
Correct Answer is B
Explanation
A. Myringotomy: Myringotomy is a procedure involving the insertion of tubes into the eardrum to treat conditions such as chronic ear infections. This procedure is not associated with a significant risk of deep-vein thrombosis.
B. Hip arthroplasty: Hip arthroplasty, or hip replacement surgery, is associated with an increased risk of deep-vein thrombosis due to factors such as immobility, surgical trauma, and alterations in blood flow. Prophylactic measures, such as anticoagulant medications and early ambulation, are often employed to reduce this risk.
C. Cataract extraction: Cataract extraction is a procedure to remove a cloudy lens from the eye. This surgery is not typically associated with a high risk of deep-vein thrombosis.
D. Laparoscopic appendectomy: Laparoscopic appendectomy, a minimally invasive procedure to remove the appendix, is generally associated with a lower risk of deep-vein thrombosis compared to major orthopedic surgeries like hip arthroplasty.
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