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Breathing resistance in your delivery system can cause a lot of problems namely CO2 buildup but when you are dealing specifically with pulmonary issues the downward spiral is both breathing resistance and O2 damage will reduce inspiration(not a popular word on this list for other reasons)volume. If your working diver friends are doing dives that require that extensive deco then they should be increasing a constant ventilation at all stops with increased PO2. I doubt that they are using a non-positive pressure hat. BIBS masks in a habitat or chamber should be in excellent condition before starting a dive or treatment. I have never seen any problems attributed to breathing resistance on a BIBS mask. For recreational diving with extended times dont get stingy with your deco regs. One of the few selling points of rebreathers is lack of breathing resistance so you could buy on for deco. Also while the sharpshooters are still busy lock & loading, you could try a positive pressure FFM, Interspiro AGA, EXO-26 etc. Okay their kicking in the door now I only have seconds ... You could mate a Cressi sub FFM with a way overtuned 2nd stage reg and .....AAAHHHHHHHHHH...... THIS IS THE CENTRAL SCRUTINIZER, ISAACS DOMICILE HAS BEEN SEARCHED AND ALL WE FOUND WAS HIS PADI OWSI CARD AND APPROXIMATELY 612LBS OF POSEIDON REBUILD PARTS. QUESTION, HAVE YOU OR ANYONE ELSE BEEN DIVING 80/20 TO 30'?? HAVE A NICE DAY >From: "johnny christensen" <johnny_chri@ho*.co*> >To: icallicrate@ho*.co* >CC: techdiver@aquanaut.com >Subject: RE: Dr Black/ChamberHaters >Date: Wed, 12 Dec 2001 00:34:15 > >Hi Isaac > >3 years back I used to do dives that required 1-1� hr on 80%. >On a couple of ocations I stayed 2� hrs on 80% just to see when any >pulmonary symptoms would begin. No gas breaks done. In these exposures >there >was really no significant symptoms. > >When I do pure O2 now, I get the symptoms after 30-40min. There I'm doing >15 >/ 3 gasbreaks (but using the 50% decogas to "break" on) > >From my chamber experience and talking to comercial divers, the inhalation >resistance on the O2 reg or mask, has a major influence on how your lungs >are going to feel afterwards. > >BTW, no agency is using Navy tabels anymore. I think even TDI stopped 2 or >3 >years ago. > >Regards > >Johnny Christensen > > >>From: "Isaac Callicrate" <icallicrate@ho*.co*> >>To: trey@ne*.co*, techdiver@aquanaut.com >>Subject: RE: Dr Black/ChamberHaters >>Date: Tue, 11 Dec 2001 12:48:16 -0500 > >-snip- > >>>Im interested to hear if any of the IANTD's on the list have done a >>long >>enough exposure to see pulmonary issues on 80/20? I hope Im not the only >>one >>getting something out of this. (Everyone take a turn squeezing more out of >>Trey while he is feeling generous) >>Thanks > > >_________________________________________________________________ >Chat with friends online, try MSN Messenger: http://messenger.msn.com > >-- >Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. >Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. _________________________________________________________________ Join the world�s largest e-mail service with MSN Hotmail. http://www.hotmail.com -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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