Table 2 Typical clinical features of nitrogen narcosis
Nitrogen partial pressure (bar)Symptoms and signs
2–4Mild impairment of performance of unpractised tasks
Mild euphoria
4Impaired reasoning and immediate memory
Delayed response to visual and auditory stimuli
Increased reaction time
4–6Overconfidence and fixed thinking
Calculation errors
6Impaired judgement
Hallucinations
6–8Laughter approaching hysteria
Talkative, occasional dizziness
8Severely impaired intellectual performance
Mental confusion, impaired concentration
10Stupefaction
>10Hallucinations, unconsciousness, death