The nurse is caring for a client with respiratory alkalosis. Which arterial blood gas data does the nurse anticipate finding?
A.
pH-7.10. CO2-78. HCO3-25
B.
pH-7.55. C02-20. HCO3-24
C.
pH-7.25, CO2-64, HCO3-22
D.
Ph-7.0. CO2-72. HCO3-26
The correct answer and Explanation is :
The correct answer is B. pH-7.55, CO2-20, HCO3-24.
Explanation
Respiratory alkalosis is a condition where the blood pH is elevated (alkalosis) due to a decrease in carbon dioxide (CO2) levels, which results from hyperventilation or other causes of CO2 loss. Here’s a breakdown of the arterial blood gas (ABG) values associated with respiratory alkalosis:
- pH: In respiratory alkalosis, the pH of the blood is elevated, typically above 7.45. In this case, the pH is 7.55, which indicates alkalosis.
- CO2: Respiratory alkalosis is characterized by a low partial pressure of carbon dioxide (pCO2) because the hyperventilation causes an excessive loss of CO2. In option B, the CO2 level is 20 mmHg, which is lower than the normal range (35-45 mmHg).
- HCO3: In primary respiratory alkalosis, the bicarbonate (HCO3) level may be normal initially, though it can be slightly altered in chronic cases as the body compensates. In this scenario, the HCO3 is 24 mEq/L, which is within the normal range (22-26 mEq/L), indicating that the condition is likely acute and not yet compensated.
Summary:
- Option A: pH of 7.10 indicates acidosis, not alkalosis. The CO2 level of 78 mmHg and HCO3 level of 25 mEq/L suggest respiratory acidosis with possible metabolic compensation.
- Option C: pH of 7.25 is acidic, indicating acidosis. CO2 is high at 64 mmHg, which suggests respiratory acidosis.
- Option D: pH of 7.0 is also acidic, with CO2 of 72 mmHg indicating a severe respiratory acidosis.
Thus, option B is the most consistent with respiratory alkalosis, where the elevated pH and low CO2 levels reflect the underlying condition.