A nurse is assisting with the care of a client in a PACU. Which of the following actions should the nurse take during the management of oxygenation for this client? Select all that apply.

A. Add a humidifier to the oxygen device: Oxygen delivered at higher flow rates via nasal cannula can dry the mucous membranes, leading to discomfort and potential mucosal irritation. Adding a humidifier maintains mucosal moisture and improves tolerance of oxygen therapy. B. Place the client in the supine position: Supine positioning can reduce lung expansion and promote atelectasis, especially in a post-sedation client. Encouraging upright or semi-Fowler’s positioning enhances ventilation and oxygenation. C. Examine the client's nail beds: Assessing nail beds provides a quick visual indicator of tissue oxygenation and perfusion, allowing the nurse to evaluate the effectiveness of oxygen therapy and detect early hypoxemia. D. Encourage client to perform deep breathing exercises: Deep breathing and incentive spirometry help prevent atelectasis, promote alveolar expansion, and improve oxygenation, particularly important after sedation and colonoscopy. E. Prepare to administer oxygen via Venturi face mask: A Venturi mask is typically used for precise oxygen delivery in chronic respiratory disease. For a post-procedure client requiring 2–5 L/min to maintain SpO₂ > 92%, nasal cannula is appropriate, and escalation to a Venturi mask is not indicated at this stage.