A client in the emergency department reports that he has been vomiting excessively for the last 2 days. His arterial blood gas (ABG) analysis shows a pH of 7.50, the partial pressure of arterial carbon dioxide (PaCO2) of 43 mm Hg, partial pressure of arterial oxygen (PaO2) of 75 mm Hg, and bicarbonate (HCO3) of 42 mEq/L. Based on these findings, the nurse documents that the client is experiencing which type of acid-base imbalance?
Metabolic Alkalosis
Respiratory Alkalosis
Respiratory Acidosis
Metabolic Acidosis
The Correct Answer is A
A. Metabolic Alkalosis:
pH: Elevated (alkalotic).
PaCO2: Normal or slightly decreased (compensation may or may not be present).
HCO3: Elevated.
Explanation: Metabolic alkalosis is characterized by an excess of bicarbonate (HCO3) in the blood, leading to an elevated pH. In this case, the elevated pH and HCO3 levels suggest that the primary imbalance is metabolic alkalosis.
B. Respiratory Alkalosis:
pH: Elevated (alkalotic).
PaCO2: Decreased (due to hyperventilation, which blows off CO2).
HCO3: Normal or slightly decreased (compensation).
Explanation: Respiratory alkalosis is characterized by low levels of carbon dioxide (PaCO2) due to hyperventilation. However, in the provided ABG, the PaCO2 is not significantly decreased, suggesting that respiratory alkalosis is not the primary issue.
C. Respiratory Acidosis:
pH: Decreased (acidotic).
PaCO2: Increased (due to inadequate ventilation).
HCO3: Normal or slightly elevated (compensation).
Explanation: Respiratory acidosis is characterized by an increase in carbon dioxide (PaCO2) levels. In this case, the PaCO2 is within the normal range, indicating that respiratory acidosis is not the primary problem.
D. Metabolic Acidosis:
pH: Decreased (acidotic).
PaCO2: Normal or slightly decreased (compensation).
HCO3: Decreased.
Explanation: Metabolic acidosis is characterized by a decrease in bicarbonate (HCO3) levels. In this ABG, the HCO3 is elevated, ruling out metabolic acidosis as the primary issue.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is D
Explanation
A. "When I went to the restroom the last few days, my urine smelled odd."
Changes in the smell of urine can be associated with various conditions, including diabetes. However, it's not a specific symptom.
B. "I've always been a fan of sweet foods, but lately I'm turned off by them."
A change in taste preferences may not be directly related to diabetes. It's not a typical symptom.
C. "No matter how much sleep I get, it seems to take me hours to wake up."
Fatigue and difficulty waking up are general symptoms that can be caused by various factors, including diabetes. However, it's not specific to diabetes alone.
D. "Lately, I drink a lot, but I can't seem to quench my thirst."
Excessive thirst (polydipsia) and increased urination (polyuria) are classic symptoms of diabetes, suggesting elevated blood sugar levels.
Correct Answer is A
Explanation
A. Methylprednisolone (Solu-medrol):
Explanation: Acute adrenal insufficiency is a life-threatening condition characterized by a sudden deficiency of adrenal hormones. In this situation, intravenous glucocorticoids such as methylprednisolone are administered to replace the deficient hormones and stabilize the patient. This is the appropriate intervention to address the acute adrenal crisis.
B. Hypotonic saline:
Explanation: Hypotonic saline is not the first-line treatment for acute adrenal insufficiency. The priority is to replace glucocorticoids to address the adrenal hormone deficiency.
C. Potassium (K-dur):
Explanation: While electrolyte imbalances can occur in adrenal insufficiency, potassium replacement alone does not address the primary issue of glucocorticoid deficiency in acute adrenal insufficiency.
D. Regular Insulin:
Explanation: Regular insulin is not the primary treatment for acute adrenal insufficiency. Glucocorticoid replacement, such as methylprednisolone, is the key intervention.
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