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Wendell,
The attitude of the diving medical community on PFO significance is
based on their perspective that divers are all "coral stompers" and any
bubbling will be short lived and will not grow in size. I agree with your
assessment that the fringe community of technical divers are not considered
(or, at least not weighted heavily) in these studies. Nevertheless, to
ignore the potential for disaster in PFO shunting is reckless and stupid.
Seems like someone at NASA once said, "So, what if some of the hot gas gets
past the SRB o-rings? It won't hurt anything." That's just my thoughts,
maybe we should get a second opinion from MJB for the definitive
ophthalmologist point of view.
Chris Elmore
PalmettoSoft Technologies Corp.
(803) 233-2001 (work)
(803) 348-3055 (mobile)
----- Original Message -----
From: wendell grogan <docgrog@ya*.de*>
To: Matthias Voss <mat.voss@t-*.de*>
Cc: <quest@gu*.co*>; <techdiver@aquanaut.com>
Sent: Monday, June 11, 2001 4:49 PM
Subject: Re: Not opening PFO's, waqs RE: Repairing PFO's
>
> --- Matthias Voss <mat.voss@t-*.de*> schrieb: > I
> think Mike's comment is much closer to the point
> > than the DAN's
> > insights.
> > Matthias
> > (edited because its too bloody long)
>
> The problem with this whole discussion is that
> everyone is using correct data, but coming to
> different conclusions because they're not all looking
> at the questions asked by the research quoted nor the
> question that applies to technical diving.
> The studies have been aimed at two groups- commercial
> divers who have had embolic hits and recreational
> divers. The conclusions by Dr. Bove apply to those
> groups because thats who was studied.
> Now, what is the correct answer for technical diving?
> I do not feel there is enough data on this particular
> small sub group of the diving community to say it is
> safe to dive not knowing if you have a PFO
> until/unless you get bent.
> Tech diving generally does not include during your
> deco in a chamber on a routine basis. If you are a
> commercial diver, you will decompress in a chamber and
> if you start to have a hint of a problem, the schedule
> will be adjusted accordingly. If you are a coral
> stomper, then you don't get deep enough or stay down
> long enough hoovering your al80 to hurt yourself
> unless you hold your breathe going up. In either
> case, the standard DAN advice applies.
> Techdiving involves staged deco in the water which
> means that 1) everyone is trying to minimize the
> amount of time they have to float around after the fun
> part of the dive is over, and 2) shit happens in
> proportion to the number of potential sources of fecal
> evolution. Since this is a different scenerio than
> that considered in available research data, I think
> you have two choices- stay very conservative or get
> checked. If you have a PFO, then you need to know how
> severe it is and then be able to decide based on your
> relative risk of getting embolized whether you want to
> give up tech diving or take the risks involved in
> getting the flap closed.
> Wendell
>
>
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