U.S. Navy saturation diving and diver neuropsychologic status.

Area of Science:

• Physiology
• Neuroscience
• Diving Medicine

Background:

• Saturation diving involves prolonged exposure to high pressures.
• Helium-oxygen mixtures are used as breathing gases in deep saturation dives.
• Understanding the neurocognitive effects of saturation diving is crucial for diver safety.

Purpose of the Study:

• To assess the neuropsychologic status of U.S. Navy saturation divers before and after saturation dives.
• To identify any permanent or transient changes in cognitive function.
• To evaluate the safety of prolonged saturation diving operations.

Main Methods:

• Neuropsychologic assessments were administered to 25 male U.S. Navy divers.
• Divers underwent saturation dives to simulated depths of 198 to 335 msw.
• Dive durations ranged from 26 to 31 days using helium-oxygen breathing gas.

Main Results:

• No permanent changes in neuropsychologic status were observed post-dive.
• Transient alterations in affect, visual focusing, and physical activity were noted upon surfacing.
• These transient effects resolved within 10 days after the dive.

Conclusions:

• Saturation diving to depths of 335 msw with helium-oxygen appears safe regarding long-term neuropsychologic function.
• Transient neurocognitive effects are expected but are temporary and resolve quickly.
• Further research may explore the specific mechanisms of transient alterations.