[abstract] A PROBABILISTIC GAS AND BUBBLE DYNAMICS MODEL PROVIDES IMPROVED ESTIMATES OF DCS RISK DURING OXYGEN DECOMPRESSION FROM AIR DIVES

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[abstract] A PROBABILISTIC GAS AND BUBBLE DYNAMICS MODEL PROVIDES IMPROVED ESTIMATES OF DCS RISK DURING OXYGEN DECOMPRESSION FROM AIR DIVES

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dc.contributor.author Gerth, WA en_US
dc.contributor.author Vann, RD en_US
dc.date.accessioned 2006-07-29T23:00:21Z
dc.date.available 2006-07-29T23:00:21Z
dc.date.issued 1997 en_US
dc.identifier.other Undersea Hyp Med 1997 en_US
dc.identifier.uri http://archive.rubicon-foundation.org/370
dc.description Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org ) en_US
dc.description.abstract BACKGROUND: A probabilistic model in which DCS risk is a function of modeled bubble volumes in three parallel-perfused gas exchange compartments [BVM(3)] has been shown to correlate and perform about the data used to parameterize the U.S. Navy Air/N2-O2 Algorithm (USN93) as well as USN93. However, the performance of BVM3 about dives in which 100percent oxygen is breathed during decompression, where USN93 has been shown to under-estimate DCS risk, has not been examined. METHODS: Data from a chamber dive trial at the Naval Medical Research Institute (NMR94EOD) reported by Survanshi, et al. [Undersea and Hyperbaric Med 22(S):66, 1995] and an unpublished series of 130 fsw air dives at Duke University (MOONVQ) were analyzed using BVM(3) and our independent implementation of USN93 [USN93(D)]. Dives used decompressions consisting of periods of 100percent oxygen breathing (25 min O2 followed by 5 min air) commencing on arrival at the 60, 50 or 40 fsw stop. RESULTS: BVM(3) underestimated observed DCS incidence in each of the dive series less severely than USN93(D) [Table 1] and, excepting the 60/180 schedule, prescribed total oxygen decompression times (TDT @ 5percent limiting PDCS) for specific depth/bottom time combinations close to those accepted in the NMRI trial (PDCS less than 5percent @ 90percent confidence) [Table 2]. Table 1 Table 2 :::--------- number DCS ---------:Profile:Accepted:Prescribed: Data Set:Profiles:Exposures:Observed:Predicted:Fsw/min:TDT, mon:TDT, min: ::::USN93(D):BVM(3):::USN93(D):BVM(3) NMR94EOD:7:284:17.3:8.1:13.4:60/180:21:22:13 MOONVQ:5:69:3.3:0.2:1.2:60/240:61:64:58 Totals:12:353:20.6:8.3:14.6:150/55:85:39:82 ::::::170/40:58:26:67 Marginal DCS counted as 0.1 incident CONCLUSION: Severance of the direct link between compartmental gas supersaturation and DCS risk that is characteristic of USN93 and insertion of intervening processes modeled as bubble growth and resolution allows BVM(3) to provide improved prescriptions for oxygen decompressions from air dives without empirical adjustments required by USN93. (Supported by NOAA-NURP, USSOC and DAN). en_US
dc.language.iso en_US
dc.rights Undersea and Hyperbaric Medical Society, Inc. (http://www.uhms.org ) en_US
dc.subject decompression en_US
dc.subject BUBBLE DYNAMICS en_US
dc.subject PROBABILISTIC GAS en_US
dc.subject air en_US
dc.subject chamber en_US
dc.subject model en_US
dc.subject oxygen en_US
dc.title [abstract] A PROBABILISTIC GAS AND BUBBLE DYNAMICS MODEL PROVIDES IMPROVED ESTIMATES OF DCS RISK DURING OXYGEN DECOMPRESSION FROM AIR DIVES en_US

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