Final answer:
The priority action by the nurse in this situation is to establish a patent airway.
Step-by-step explanation:
The priority action by the nurse in this situation is to establish a patent airway.
When the nurse finds the older adult client unresponsive and on the floor, it indicates a potential medical emergency. The first priority is to ensure that the client is able to breathe properly. The nurse should open the client's airway and check for any obstructions or signs of respiratory distress.
Once the airway is established and the client's breathing is stable, the nurse can proceed to assess other vital signs and notify the client's family members or emergency medical services as necessary.