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Decompression illness — DipIMC MCQ

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HardEnvironmental MedicineDecompression illnessDipIMC

A 41-year-old diver surfaces rapidly and develops joint pain, dizziness and leg weakness. Oxygen saturations are 98% on air and symptoms began 20 minutes after ascent. What is the most appropriate management?

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Correct answer: E — Give high-concentration oxygen, keep supine and seek diving medicine advice

Neurological decompression illness requires high-concentration oxygen and specialist hyperbaric advice even when pulse oximetry is normal. Entonox is contraindicated because nitrous oxide can expand gas bubbles. Further diving or commercial flight can worsen decompression stress. The pearl is that normal saturations do not reflect inert gas bubble pathology.

Reference: JRCALC Guidelines 2025; UK Diving Medical Committee guidance