You are part of a helicopter retrieval service dispatched to a patient who has collapsed on a dive boat on a nearby reef.

1. List six diving-related or non-diving-related differential diagnoses. 6 marks

2. List six historical features that help differentiate the cause of collapse. 6 marks

3. List four body systems affected by decompression illness and one clinical feature for each. 4 marks

4. Outline two key considerations during helicopter retrieval. 2 marks