You Have Just Arrived by the Side of an Elderly

You have just arrived by the side of an elderly patient who took excessive amounts of his daily medications after becoming confused about what to take and when. Which one of the following is the immediate priority in caring for this patient?

A) Determine what medications were taken and how much.
B) Determine the patient's past medical history.
C) Gather up all medications for transport with the patient.
D) Evaluate and support the patient's airway and breathing.