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 A
Explanation
A. "I have difficulty breathing when walking 30 feet":
Explanation: Difficulty breathing on exertion (dyspnea) is a common symptom of iron-deficiency anemia. This is because iron is a crucial component of hemoglobin, which carries oxygen to body tissues. In the absence of sufficient iron, the oxygen-carrying capacity of the blood is reduced, leading to symptoms such as shortness of breath.
B. "I feel hot all of the time":
Explanation: Feeling hot all the time is not a typical symptom of iron-deficiency anemia. Anemia is more likely to cause symptoms related to poor oxygen delivery, such as fatigue and shortness of breath.
C. "I have a difficult time falling asleep at night":
Explanation: Difficulty falling asleep is not a classic symptom of iron-deficiency anemia. Symptoms are more likely to be related to fatigue and weakness.
D. "I have an increase in my appetite":
Explanation: An increase in appetite is not a typical symptom of iron-deficiency anemia. In fact, individuals with anemia may experience a decrease in appetite.
Correct Answer is D
Explanation
A. The need to monitor urine for the presence of albumin:
Explanation: Monitoring urine for albumin is more associated with microvascular complications, particularly diabetic nephropathy. When the kidneys are affected, albumin may leak into the urine. This is not a macrovascular complication.
B. The relationship between kidney function and blood glucose levels:
Explanation: The relationship between kidney function and blood glucose levels is important, but it is more directly related to microvascular complications, particularly diabetic nephropathy. High blood glucose levels over time can damage the small blood vessels in the kidneys.
C. The need for frequent eye examinations for clients with diabetes:
Explanation: This is related to microvascular complications, specifically diabetic retinopathy. Changes in the small blood vessels of the retina can lead to vision problems. While important, it's not directly addressing macrovascular complications.
D. The fact that clients with diabetes have an elevated risk of myocardial infarction:
Explanation: This is the correct answer. Macrovascular complications involve large blood vessels and are associated with conditions such as coronary artery disease, which increases the risk of myocardial infarction in individuals with diabetes.
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