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--part1_45.1cf55b97.2aaca824_boundary Content-Type: text/plain; charset="US-ASCII" Content-Transfer-Encoding: 7bit Greetings, As promised, when we receive abstracts for the Deco Workshop we will forward to the list (see below). The response for this workshop has been nothing short of phenomenal. Looking forward to meeting all of you in Tampa. Best regards, Timothy R. Oleary NAUI Director Technical Operations POB 3867 South Padre Island, Texas 78597 956-761-7986 956-761-6039 fax www.nauitec.com nauitec@ao*.co* "Deep" Decompression Stops and their Effect Upon Doppler Ultrasonic Bubble Signals Following 210/50 and 170/30 Dives Tom S. Neuman, MD, FACP Professor of Medicine and Surgery, Dep't of Emergency Medicine, Director, Hyperbaric Medicine Center University of California, San Diego The problem of whether "deep" decompression stops add significantly to the safety of a given decompression profile is a difficult one. Ultimately of course, this is a question that must be addressed empirically, however any studies involving decompression sickness are fraught with a variety of problems. Control groups, blinding, and the selection of an appropriate endpoint are some of the difficulties confronting any group attempting to address these issues. In the middle 1970's the US Navy had specific operational objectives that required a number of dry chamber dives to 210 FSW for 50 minutes on air and to 132 FSW for 30 minutes, using a normoxic nitrogen/oxygen mixture. At that time, we were able to make some unique observations concerning the decompression profiles used for those dive. The original intent of these experiments was to validate the reliability of Doppler ultrasonic bubble detection methods, however we were also able to make observations relating to the effect of "deeper" decompression stops upon bubble scores. For these dive profiles there was a significant reduction in bubble score associated with a short "deeper" stop, independent of overall decompression time(1). It is however premature for these results to be extrapolated across the continuum of diving exposures or across the range of decompression algorithims that currently are used to calculate decompression tables. These results may be solely a consequence of the use of the model that generated the decompression profiles used in these dives. 1. Neuman TS, Hall D, Linaweaver PG: Gas phase separation during decompression in man: Ultrasound monitoring. Undersea Biomed Res 1976;3(2):121-130. --part1_45.1cf55b97.2aaca824_boundary Content-Type: text/html; charset="US-ASCII" Content-Transfer-Encoding: 7bit <HTML><FONT FACE=arial,helvetica><FONT SIZE=2>Greetings,<BR> As promised, when we receive abstracts for the Deco Workshop we will forward to the list (see below). The response for this workshop has been nothing short of phenomenal. Looking forward to meeting all of you in Tampa.<BR> <B>Best regards,<BR> Timothy R. Oleary<BR> NAUI<BR> Director<BR> Technical Operations<BR> POB 3867<BR> South Padre Island, Texas 78597<BR> 956-761-7986<BR> 956-761-6039 fax<BR> www.nauitec.com<BR> nauitec@ao*.co*<BR> <BR> "Deep" Decompression Stops and their Effect Upon Doppler Ultrasonic Bubble Signals Following 210/50 and 170/30 Dives<BR> <BR> Tom S. Neuman, MD, FACP<BR> Professor of Medicine and Surgery, Dep't of Emergency Medicine,<BR> Director, Hyperbaric Medicine Center<BR> University of California, San Diego<BR> <BR> <BR> The problem of whether "deep" decompression stops add significantly to the safety of a given decompression profile is a difficult one. Ultimately of course, this is a question that must be addressed empirically, however any studies involving decompression sickness are fraught with a variety of problems. Control groups, blinding, and the selection of an appropriate endpoint are some of the difficulties confronting any group attempting to address these issues.<BR> In the middle 1970's the US Navy had specific operational objectives that required a number of dry chamber dives to 210 FSW for 50 minutes on air and to 132 FSW for 30 minutes, using a normoxic nitrogen/oxygen mixture. At that time, we were able to make some unique observations concerning the decompression profiles used for those dive. The original intent of these experiments was to validate the reliability of Doppler ultrasonic bubble detection methods, however we were also able to make observations relating to the effect of "deeper" decompression stops upon bubble scores. For these dive profiles there was a significant reduction in bubble score associated with a short "deeper" stop, independent of overall decompression time(1). It is however premature for these results to be extrapolated across the continuum of diving exposures or across the range of decompression algorithims that currently are used to calculate decompression tables. These results may be solely a consequence of the use of the model that generated the decompression profiles used in these dives.<BR> <BR> 1. Neuman TS, Hall D, Linaweaver PG: Gas phase separation during decompression in man: Ultrasound monitoring. Undersea Biomed Res 1976;3(2):121-130.<BR> <BR> </B></FONT></HTML> --part1_45.1cf55b97.2aaca824_boundary-- -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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