A client with COPD has all of the following ABG changes from earlier today. Which change alerts the nurse to take immediate action to prevent harm?

A. Although the pH is slightly lower, both values indicate acidemia, which is consistent with chronic compensated respiratory acidosis often seen in COPD. The small change is not immediately life-threatening and may reflect normal fluctuations. B. Elevated bicarbonate in COPD reflects renal compensation for chronic hypercapnia. The stability of HCO3 suggests that the body’s compensatory mechanism is intact and does not indicate an acute deterioration. C. This represents a rapid and significant rise in carbon dioxide levels, indicating acute ventilatory failure. Even though some patients with COPD tolerate chronically elevated PaCO2, a jump of this magnitude is dangerous. It can cause worsening respiratory acidosis, decreased level of consciousness, headache, confusion, and eventual respiratory arrest. The nurse must take immediate action by assessing the airway, ensuring effective ventilation, positioning the patient to optimize breathing, and notifying the healthcare provider for urgent interventions such as noninvasive positive-pressure ventilation (BiPAP) or intubation if needed. D. This is a minimal decrease in oxygenation. COPD patients often have baseline hypoxemia, and this small change does not indicate immediate danger. Focus should first be on the sudden rise in PaCO2, which poses a more acute threat.