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Visual reaction time performance preceding CNS oxygen toxicity.

M D Curley, F K Butler

    Undersea Biomedical Research
    |July 1, 1987
    PubMed
    Summary
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    The visual reaction time test did not reliably detect central nervous system (CNS) oxygen toxicity in divers. Most toxicity episodes occurred without prior changes in reaction time performance.

    Area of Science:

    • Diving Medicine
    • Neuroscience
    • Human Performance

    Background:

    • Development of closed-circuit 100% oxygen breathing diving schedules for the U.S. Navy.
    • Assessment of diver performance under hyperbaric conditions.

    Observation:

    • Divers performed visual reaction time tests using the Performance Measurement System (PMS) during excursion dives.
    • Divers used a Draeger LAR V rebreather and performed moderate work on an underwater ergometer.
    • Six divers experienced seven episodes of CNS oxygen toxicity during testing.

    Findings:

    • Only two of seven CNS oxygen toxicity episodes were preceded by altered reaction time (slowing or increased variability).
    • Five toxicity episodes occurred without any preceding changes in reaction time performance.

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  • Objective and subjective toxicity symptoms did not correlate with reaction time performance.

    • Implications:

    • The PMS visual reaction time test is not a reliable method for detecting CNS oxygen toxicity in this diving context.
    • Further research is needed to identify reliable biomarkers for early detection of oxygen toxicity during diving.
    • This finding may impact safety protocols for saturation and experimental diving operations using 100% oxygen.