[abstract] INERT GAS NARCOSIS LIMITATIONS ON NITROGEN-OXYGEN DIVING.

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[abstract] INERT GAS NARCOSIS LIMITATIONS ON NITROGEN-OXYGEN DIVING.

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Title: [abstract] INERT GAS NARCOSIS LIMITATIONS ON NITROGEN-OXYGEN DIVING.
Author: Moeller, GO
Abstract: At some pressure in excess of 5 ATA inert gas narcosis can become the major factor limiting exposures to nitrogen-oxygen respiratory media. That limitation may be reduced either directly or indirectly. The Naval Submarine Medical Research Laboratory (NSMEU) is studying two related methods of indirect attack on the problem, saturation diving and repeated exposures at brief intervals. Performance impairment has been obtained consistently in both motor and cognitive tasks during repeated exposures to compressed air at pressures in excess of 6 ATA. While the magnitudes of the effects are substantially greater in the first exposure than at intervals of 1, 3, and 28 days, interpretation by analogy with high adaptation does not appear to be appropriate. Saturation diving may be viewed as a special case of repeated exposure in which interval between dives is reduced to the limit. The human performance data available from NSMRL compressed air and nitrogen-oxygen saturation dives, with and with- out excursions to other depths does not support that simple extrapolation unequivocally. A principal factor in that uncertainty is the absence of information regarding changes in susceptibility to narcosis during the early portion of saturation exposures. A renewed interest in psychogenic factors in inert gas narcosis is evident in reports emphasizing the role of anxiety in impairment of motor function at depth and in controversy regarding state-, or context-, dependence of performance impairment. NSMRL findings suggest that relative susceptibility of various functions to anxiety effects may be related more closely to measurement technology than to fundamental biological processes.
Description: Abstract of the Undersea and Hyperbaric Medical Society, Inc. Annual Scientific Meeting held May 13-16, 1977. Holiday-Inn, Toronto, Ontario, Canada (http: www.uhms.org)
URI: http://archive.rubicon-foundation.org/4135
Date: 1977

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  • UHMS Meeting Abstracts
    This is a collection of the published abstracts from the Undersea and Hyperbaric Medical Society (UHMS) annual meetings.

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