Case 1 29-year-old housewife is brought to the emergency department following exposure to smoke during a house fire. She is breathing at a rate of 30 breaths/min. Her heart rate is 110 beats/min. Blood pressure is 160/110 mm Hg. The patient complains of headaches and nausea. The pulse oximeter reading shows a saturation of 99%. Why are pulse oximeter readings unreliable in this setting? What is wrong with this patient? What action would you take at this time?