The HPNS reference article from the English Wikipedia on 24-Apr-2004 (provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

HPNS

HPNS, High Pressure Nervous Syndrome or Helium Tremors is a diving disorder caused by using breathing gases that contain helium at depths in excess of 130 metres / 429 feet.

The symptoms are muscle twitching, co-ordination difficulties, confusion, disorientation, drowsiness and unconsciousness.

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