Statistically Based Decompression Tables. I. Analysis of Standard Air Dives: 1950-1970.

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Statistically Based Decompression Tables. I. Analysis of Standard Air Dives: 1950-1970.

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dc.contributor NAVAL MEDICAL RESEARCH INST BETHESDA MD en_US
dc.contributor.author Weathersby, PK en_US
dc.contributor.author Survanshi, SS en_US
dc.contributor.author Homer, LD en_US
dc.contributor.author Hart, BL en_US
dc.contributor.author Nishi, RY en_US
dc.date.accessioned 2006-08-30T03:18:21Z
dc.date.available 2006-08-30T03:18:21Z
dc.date.issued 1985 en_US
dc.identifier.govdoc ADA157555 en_US
dc.identifier.govdoc NMRI-85-16 en_US
dc.identifier.other PE63713N en_US
dc.identifier.other WUDN177792 en_US
dc.identifier.uri http://archive.rubicon-foundation.org/3402
dc.description Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center (http://www.dtic.mil/) is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested. en_US
dc.description.abstract A large number of air dives was examined by a new methodology. Several essentially empirical models of decompression risk were considered that predicted the probability of decompression sickness (DCS) for a given pressure exposure to avoid the indefinitely sharp threshold parameters that have characterized previous calculation of decompression tables. The candidate models used several distinct formulations of tissue gas exchange kinetics and summed tissue overpressures that are calculated during the dive to estimate decompression risk. The models were compared to decompression outcome data using the statistical principle of maximum likelihood. Reported decompression trials from American, British, and Canadian Naval laboratories were examined individually and collectively to evaluate the probabilistic models and their parameters. Only two to five parameters were found to be justified by the available data (more than 1,700 individual exposures were considered). Diving data from various sources were only partially compatible; some of the discrepancy may arise from an evolution of diagnostic criteria over several decades. Predictions were made of the outcome for additional reported diving series, and they were only partly successful. The models were then used to estimate decompression risk for current USN air diving with a finding of a wide range of hazard. Specifically, it appears that short dives are quite safe, even to a moderately deep depth, while long exposures are very risky regardless of depth. These findings will be used to produce a set of standard air tables with a uniform and low level of DCS risk. (Author) en_US
dc.format.extent 7782662 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.rights Citation Status: Active; Citation Classification: Unclassified; Title Classification: Unclassified; Report Classification: Unclassified; Identifier Classification: Unclassified; Abstract Classification: Unclassified; Distribution Limitation(s): 01 - APPROVED FOR PUBLIC RELEASE; Information provided by the Department of Defense and the Defense Technical Information Center (http://www.dtic.mil/) is considered public information and may be distributed or copied unless otherwise specified. Use of appropriate byline/photo/image credits is requested. en_US
dc.subject TABLES(DATA) en_US
dc.subject DECOMPRESSION SICKNESS en_US
dc.subject DECOMPRESSION en_US
dc.subject METHODOLOGY en_US
dc.subject TISSUES(BIOLOGY) en_US
dc.subject COMPUTATIONS en_US
dc.subject RISK en_US
dc.subject HAZARDS en_US
dc.subject EXPOSURE(GENERAL) en_US
dc.subject MODELS en_US
dc.subject AIR en_US
dc.subject PARAMETERS en_US
dc.subject THRESHOLD EFFECTS en_US
dc.subject PROBABILITY en_US
dc.subject OVERPRESSURE en_US
dc.subject PRESSURE en_US
dc.subject LOW LEVEL en_US
dc.subject EVOLUTION(GENERAL) en_US
dc.subject DIAGNOSIS(GENERAL) en_US
dc.subject SHORT RANGE(DISTANCE) en_US
dc.subject RANGE(EXTREMES) en_US
dc.subject DIVING en_US
dc.subject SHARPNESS en_US
dc.subject DEEP DEPTH en_US
dc.title Statistically Based Decompression Tables. I. Analysis of Standard Air Dives: 1950-1970. en_US

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