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Chapter 19 — 1
Chapter 19
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HIGH PRESSURE
NEUROLOGICAL
SYNDROME
(HIGH PRESSURE NERVOUS
SYNDROME, HPNS,
HELIUM TREMORS)
This condition is a problem for deep commercial diving operations where helium/oxygen
(Heliox) mixtures are breathed at depths in excess of 130 metres (430 feet). It causes a
serious limitation to very deep diving and gets worse as the depth increases.
It is not a problem to recreational divers unless a grave (sic) miscalculation of depth or
buoyancy has been made.
Fig. 19.1