A client sustained a head injury when hit by a lead pipe two hours ago and is admitted for observation after the computerized tomography (CT) scan indicates that no spinal cord injury and no skull fractures are present. When the client begins projectile vomiting, the nurse quickly turns the client's head to the side and administers ondansetron 4 mg IV as prescribed. Reassessment indicates that the client's Glasgow coma score is 13 and the left pupil is dilated without reaction to light. Which intervention(s) should the nurse implement? Select all that apply.