High-pressure nervous syndrome
NEUROLOGICAL AND PHYSIOLOGICAL DISORDER EXPERIENCED BY DIVERS
HPNS; High Pressure Nervous Syndrome; Helium Tremors; High pressure neurological syndrome; High pressure nervous syndrome
High-pressure nervous syndrome (HPNS – also known as high-pressure neurological syndrome) is a neurological and physiological diving disorder which can result when a diver descends below about using a breathing gas containing helium. The effects experienced, and the severity of those effects, depend on the rate of descent, the depth and the percentage of helium.