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From: "Duane Liptak Jr." <dliptakjr@ea*.ne*>
To: <techdiver@aquanaut.com>
Subject: Fw: bouncing - the risks
Date: Wed, 6 Feb 2002 08:43:22 -0600
* If somebody wants to put that post on here, go ahead*

May 22, 2001, Trey wrote:

>
> Guys read this for once.
>
> WHY WE DO NOT BOUNCE DIVE AFTER DIVING IN THE WKPP
>
>It is ok to offgas from the tissues into the blood stream in bubble form in
>the later steps of decompression as it is a more efficient, faster way of
>getting rid of the remaining gas ( by reduced pressure ) than by elevated
>oxygen alone ( which starts taking exponentially more time with greater
>risk) . However, this depends on having a good lung filter and no shunts.
>All of you have been PFO tested if you are diving with us.
>
>The correct way to ascend from the last stop is one foot per minute for the
>bigger dives.
>
>The greatest potential for offgassing in bubble form is when the pressure
is
>totally removed back to one ATA out of the water. Now you get a real shower
>of bubbles , relative to what was happening in the water. A good , clean
>deco with the foot per minute ascent reduces this dramatically .
>
>In MOST people, the greatest bubbling occurs out of the water and continues
>for up to four hours, not even peaking for a couple of hours. In a well
>vascularized, fit person like me, it is over with in 30 minutes. Don't bet
>on that with most of you.
>
>In ALL people, the bubbles continue to grow in size after the pressure is
>off. They accumulate like gas into themselves from the surrounding blood or
>tissues ( if there are bubbles in the tissues or injury sites ) and they
>grow bigger. This is why you feel pain later rather than earlier if the
>bubbles are in joints or tissues - they get bigger before they begin to
>shrink. This is why what starts out as micro bubbles can get by the lungs
>and grow and get lodged downstream, and you get neurological symptoms
later.
>
>Now here is the important part. If you understand everything I have said
>above, then you know that bouncing to 20 feet or whatever to pick up a
>bottle and immediately returning to the surface is the like giving yourself
>a home-made PFO: the bubbles in the venous side compress enough to get past
>the lungs and then will reexpand on the arterial side and lodge in the
worst
>places , the spine and brain blood supplies. You do not want this.
>
>If you dive after dive, stay down and let everything reset. Get the bubbles
>all compressed, and then deco out and ascend accordingly.
>
>I do not want support divers diving support within four hours of doing a
>real dive or deep support. This works out fine, since we have support
>activities lasting up to 18 to 24 hours and need to rotate everyone.
>
>Let me assure you that we have found this out the hard way in the past.
>Parker used to get hot as hell when it would happen. In those days we had
>"volunteers", and they would all get bent diving to 20 feet to pick up
>bottles. We have also seen some severe cases of this where dives were done
>away from the project with no support, and the players went back for
bottles
>later and got hammered.
>
>Don't do it. Also, obviously, do not freedive after a dive. When you want
to
>freedive, do that first and then go scuba diving.
>
>Any questions from WKPP guys?
>
>--
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>

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