First aid for suspected decompression sickness may include all of the following except:

First aid for suspected decompression sickness may include all of the following except:

• A. Activate the EMS system and contact the Divers Alert Network (DAN).
• B. Monitor the patient's vital signs.
• C. Get the diver back in the water and repeat any missed or omitted decompression.
• D. Administer pure oxygen.

Answer: (C)

The main idea is that suspected decompression sickness is treated by stopping further exposure, giving high‑flow oxygen, and getting professional care as quickly as possible, not by trying to re-create decompression in the field. Re-entering the water to repeat any missed decompression can worsen bubbles and symptoms and is not a valid first-aid step. The appropriate actions are to activate EMS and contact DAN so experts can arrange rapid hyperbaric treatment, monitor the diver’s vital signs to catch any deterioration, and administer pure oxygen to accelerate nitrogen washout and improve tissue oxygenation.

The main idea is that suspected decompression sickness is treated by stopping further exposure, giving high‑flow oxygen, and getting professional care as quickly as possible, not by trying to re-create decompression in the field. Re-entering the water to repeat any missed decompression can worsen bubbles and symptoms and is not a valid first-aid step. The appropriate actions are to activate EMS and contact DAN so experts can arrange rapid hyperbaric treatment, monitor the diver’s vital signs to catch any deterioration, and administer pure oxygen to accelerate nitrogen washout and improve tissue oxygenation.