Ms. Jackson has been suffering from persistent vomiting for two days now. She appears to be lethargic and weak and has myalgia. She is noted to have dry mucus membranes and her capillary refill takes >4 seconds. She is diagnosed as having gastroenteritis and dehydration. Measurement of arterial blood gas shows pH 7.5. PaO2 85 mm Hg, PaCO2 40 mm Hg, and HCO3 34 mmol/L What acid-base disorder is shown?
Metabolic Alkalosis. Partially Compensated
Respiratory Acidosis, Partially Compensated
Respiratory Alkalosis. Uncompensated
Metabolic Alkalosis. Uncompensated
The Correct Answer is D
A. Metabolic Alkalosis, Partially Compensated, is incorrect because there is no evidence of respiratory compensation (normal PaCO2).
B. Respiratory Acidosis, Partially Compensated, is incorrect because the pH is high, not low as would be expected in acidosis, and the PaCO2 is normal, not high.
C. Respiratory Alkalosis, Uncompensated, is incorrect because the primary problem is metabolic (high HCO3), not respiratory, and the PaCO2 is normal, not low as would be seen in respiratory alkalosis.
D. Metabolic alkalosis is characterized by elevated pH and bicarbonate levels. In this scenario, the pH is elevated (7.5) and the bicarbonate (HCO3) level is high (34 mmol/L), indicating alkalosis. Vomiting leads to loss of gastric acid (hydrochloric acid), causing metabolic alkalosis. The respiratory system has not yet compensated fully for the alkalosis, as indicated by the normal PaCO2 (40 mm Hg).
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
A. Aluminum hydroxide can lead to increased serum magnesium levels, but this is not the reason for its preference in chronic kidney disease.
B. Aluminum hydroxide is preferred because it binds to dietary phosphate, reducing serum phosphorus levels in patients with chronic kidney disease who are prone to hyperphosphatemia.
C. Aluminum hydroxide does not significantly affect serum potassium levels.
D. Aluminum hydroxide can lead to decreased serum calcium levels due to binding, but this is not the primary reason for its preference in chronic kidney disease.
Correct Answer is A
Explanation
A. Black Americans have a higher prevalence of diabetes mellitus compared to other racial/ethnic groups in the United States, and diabetes is a leading cause of end-stage renal disease.
B. While Hispanic/Latino individuals also have an increased risk of diabetes mellitus, it is less pronounced compared to Black Americans.
C. Non-Hispanic White individuals have a lower prevalence of diabetes mellitus compared to Black and Hispanic/Latino populations.
D. Asian Americans have a varied prevalence of diabetes mellitus depending on specific ethnicities within this group, but it is generally lower than in Black Americans.
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