Problem: A patient who received a spinal block is experiencing apnea, pupil dilation, and an unobtainable blood pressure. Which action should the nurse take first? A patient who received a spinal block is experiencing apnea, pupil dilation, and an unobtainable blood pressure. Which action should the nurse take first? ANSWER Unselected Administer ephedrine. Unselected Establish the airway. Unselected Completely open the intravenous fluid infusion. Unselected Administer oxygen.