High pressure neurologic syndrome

6 Interesting Facts of High pressure neurologic syndrome

  1. Condition associated with hyperexcitatory neurologic symptoms, which may develop at diving depths below 120 m 
  2. Attributed to helium, which is used in breathing gases for deep diving owing to absence of narcotic effects
  3. As with nitrogen narcosis, diver may exhibit behavior changes and decreased mental performance; condition resolves on return to normal pressure
  4. Unlike with nitrogen narcosis, classic symptoms include tremors, myoclonic jerking, and somnolence
  5. Occurs at depths well below those at which nitrogen narcosis occurs
  6. Differentiated on basis of diving depth, presence of characteristic symptoms, and abnormalities on EEG after a dive or hyperbaric oxygen therapy

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