A nurse is caring for a client who has just experienced a 90-second tonic-clonic seizure. The client's arterial blood gas values are as follows What action would the nurse take first? PH 7.22 Pa02 50 mm Hg PaCO2 60 mm Hg HC03 22 mEq/L

A. Administer 50 mL of 20% glucose and 20 units of regular insulin: This intervention is used to treat hyperkalemia by driving potassium into cells. The client’s ABG does not indicate a potassium emergency, so this is not the priority. B. Administer 50 mL of sodium bicarbonate intravenously: Sodium bicarbonate is used to correct severe metabolic acidosis. While the pH is low at 7.22, the immediate threat is hypoxemia, which must be addressed before correcting acidosis. C. Apply a paper bag over the client's nose and mouth: Rebreathing into a paper bag is used for respiratory alkalosis caused by hyperventilation. The client has hypoxemia and hypercapnia, so this action would worsen oxygenation and is inappropriate. D. Apply oxygen by mask or nasal cannula: The client’s PaO2 is critically low at 50 mm Hg, indicating hypoxemia, and PaCO2 is elevated at 60 mm Hg, showing hypoventilation. Administering supplemental oxygen immediately improves tissue oxygenation and is the first priority intervention after a seizure.