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

Answer and Explanation

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.

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Correct Answer is B

Explanation

A. Respiratory alkalosis: Respiratory alkalosis is characterized by a decrease in carbonic acid (CO2) due to hyperventilation, leading to an increased pH. Shallow respirations would not typically cause respiratory alkalosis.

B. Respiratory acidosis: This is the correct answer. Shallow respirations result in inadequate elimination of CO2, leading to an excess of carbonic acid and the development of respiratory acidosis.

C. Metabolic acidosis: Metabolic acidosis is characterized by a decrease in bicarbonate (HCO3-), not carbonic acid (CO2). Shallow respirations would not directly contribute to metabolic acidosis.

D. Metabolic alkalosis: Metabolic alkalosis is characterized by an increase in bicarbonate (HCO3-). Shallow respirations would not typically cause metabolic alkalosis.

A. Bradypnea B. Bradycardia C. Intercostal retractions D. Lethargy

Correct Answer is C

Explanation

A. Bradypnea: Bradypnea refers to abnormally slow breathing. In the context of postoperative atelectasis and hypoxia, the client is more likely to exhibit tachypnea (rapid breathing) as the body attempts to compensate for reduced oxygen levels.

B. Bradycardia: Bradycardia is an abnormally slow heart rate. While hypoxia can lead to changes in heart rate, it is more common to observe tachycardia (increased heart rate) as a compensatory response to decreased oxygen levels.

C. Intercostal retractions: Intercostal retractions occur when the muscles between the ribs pull inward during inspiration. In a client with atelectasis and hypoxia, increased respiratory effort may result in intercostal retractions as the body tries to enhance airflow and improve oxygenation.

D. Lethargy: Lethargy refers to a state of drowsiness or fatigue. While hypoxia can lead to lethargy, it is not a specific respiratory manifestation. Other respiratory signs, such as increased respiratory rate and retractions, are more likely to be observed.

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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?

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Naxlex Comprehensive Predictor Exams

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Correct Answer is B

Explanation

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Correct Answer is C

Explanation

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