After several days of sedation and mechanical ventilation, a client is successfully extubated and is placed on oxygen 40% by face mask. While making rounds, the nurse finds that the client is confused and is attempting to get out of bed. Vital signs are temperature 99.2° F (37.3° C), heart rate 112 beats/minute, respirations 16 breaths/minute, blood pressure 100/70, and oxygen saturation 98%. Which action should the nurse take?