An adult with COPD on chronic respiratory acidosis has ABG at 0800 showing pH 7.28, PaCO2 66 mmHg, and HCO3 22 mEq/L. An ABG drawn at 1000 would indicate the client's condition is declining if it shows which result?

An adult with COPD on chronic respiratory acidosis has ABG at 0800 showing pH 7.28, PaCO2 66 mmHg, and HCO3 22 mEq/L. An ABG drawn at 1000 would indicate the client's condition is declining if it shows which result?

• A. pH 7.24, PaCO2 56 mmHg, HCO3 22 mEq/L
• B. pH 7.28, PaCO2 66 mmHg, HCO3 22 mEq/L
• C. pH 7.32, PaCO2 62 mmHg, HCO3 24 mEq/L
• D. pH 7.30, PaCO2 70 mmHg, HCO3 20 mEq/L

Answer: (A)

In COPD with chronic respiratory acidosis, you watch how the pH changes relative to CO2 and the degree of metabolic (bicarbonate) compensation to judge whether the patient is worsening. The key is that a falling pH signifies increasing acidemia, which indicates deterioration of the respiratory status or the development of an additional acidosis, even if CO2 isn't rising. From the given options, the result with a lower pH than the initial value (7.28 dropping to 7.24) shows a worsening acidemia. Even though the PaCO2 has decreased from 66 to 56 mmHg, the pH still falls, suggesting the patient’s condition is deteriorating rather than improving. The other possibilities either show an improved pH (less acidosis) or the same state, which would not indicate decline. Thus, the ABG result that signals the client’s condition is declining is the one with pH 7.24, PaCO2 56 mmHg, and HCO3 22 mEq/L.

In COPD with chronic respiratory acidosis, you watch how the pH changes relative to CO2 and the degree of metabolic (bicarbonate) compensation to judge whether the patient is worsening. The key is that a falling pH signifies increasing acidemia, which indicates deterioration of the respiratory status or the development of an additional acidosis, even if CO2 isn't rising.

From the given options, the result with a lower pH than the initial value (7.28 dropping to 7.24) shows a worsening acidemia. Even though the PaCO2 has decreased from 66 to 56 mmHg, the pH still falls, suggesting the patient’s condition is deteriorating rather than improving. The other possibilities either show an improved pH (less acidosis) or the same state, which would not indicate decline.

Thus, the ABG result that signals the client’s condition is declining is the one with pH 7.24, PaCO2 56 mmHg, and HCO3 22 mEq/L.