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The Feb 95 issue of Discover Diving has an article (Looking Back, by Beverly
Dennis...p112) with the following quote:
"According to the chamber technician in San Pedro, Ambergris Caye, 90% of
the DCS cases they treat are divers who use computers."
According to the author, she was using a computer and dove the following
profile:
"That morning I had done a 100 foot+ dive, surfacing with plenty of time
allowed by the computer. My second dive of the morning was a mere 21 foot
dive, so I actually spent that time decompressing from the first. After
lunch I went back out and made a third dive to 87 feet. After each of the
deeper dives, I had ascended to much shallower depths for the last fifteen
minutes as a safety stop. When I surfaced after my last dive, the computer
said I still had approximately fifteen to twenty minutes of bottom time
left. According to the computer's information, I thought I was being
careful. Yet I still got bent!"
She did not say in the article what the result would have been with
tables....and did not give times for her dives....
Any comments, though, on the technician's statement?
Bob Mullins
Howard Hughes Medical Institute
mullinsr@hq*.hh*.or*
301.215.8636
----------
From: owner-techdiver
To: A.APPLEYARD; techdiver; JOHNCREA
Subject: Re[2]: a case of decompression needed out o
Date: Monday, March 20, 1995 1:37PM
Return-Path: <owner-techdiver@opal.com>
Precedence: bulk
Errors-To: owner-techdiver@opal.com
From: <OREILLYM@CC*.AB*.CO*>
Date: Mon, 20 Mar 95 13:37:22 CST
Encoding: 39 Text
Message-Id: <9502207957.AA795735437@CC*.CM*.AB*.CO*>
To: A.APPLEYARD@fs*.mt*.um*.ac*.uk*, techdiver@opal.com,
<JOHNCREA@de*.co*>
Subject: Re[2]: a case of decompression needed out o
----------------------------------------------------------------------------
--
John,
I worked in the Air Force High Altitude Life Support Systems area for
3 years back in the late 70's and prior to any High Flight the pilots
had to pre breathe oxygen for an hour prior to take off time. Also, I
took a chamber ride to one hundred and eight thousand feet and had to
pre-breathe O2 for an hour prior to the ride. I participated in many
chamber rides for pilot / and emergency training as well as some ultra
sound bubble studies done in 1979 ~ 1980 time frame. I dont understand
why a person would have to pre-breathe O2 for a ride to forty thousand
feet especially in a balloon which would take several hours to ascend
to that altitude.
I am not trained in hyperbaric medicine though I rubbed elbows with
those folks for quite awhile. My specialty was the O2 regulators and
full pressure suits.
Regards,
Mike O'Reilly
______________________________ Reply Separator
_________________________________
Subject: Re: a case of decompression needed out o
Author: <JOHNCREA@de*.co*> at UNIXMAIL
Date: 3/20/95 12:30 PM
It is the routine practice in the Space Shuttle to pre-breathe
oxygen and exercise on a bicycle prior to excursions. Suit pressure
is about 5psi (approx. 1/3 atm), and DCS was a problem before they
began to de-nitrogenate before the excursions.
In fact, DCS is fairly common in altitude chamber training for pilots.
John
(johncrea@de*.co*)
--
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