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Date: Fri, 08 Jun 2001 01:09:11 -0400
To: Wendell Grogan <wgrogan@dc*.ne*>
From: Rodriguez <mikey@ma*.co*>
Subject: Re: Not opening PFO's, waqs RE: Repairing PFO's
Cc: Trey <trey@ne*.co*>, Bruce Sherman <bruce.s@co*.co*.nz*>,

At 09:17 PM 6/7/2001 -0400, Wendell Grogan wrote:

>Sure, that's the point behind not exerting yourself for a while after
>the in water part of your off gassing.  Until you stop bubbling,
>anything you do that causes a rise in chest cavity pressure- bending and
>lifting, straining, etc- can open the PFO and shunt bubbles into your
>brain.

Unfortunately for those with PFO, a rise in pulmonary arterial pressure,
and retrograde rise in right atrial pressure secondary to the pulmonary
embolization of nitrogen/helium bubbles at the alveolar-capillary
complex would also cause right-to-left shunting through the PFO - no
exertion required.

All the more reason to get tested if you're doing technical diving.

-Mike Rodriguez
<mikey@mi*.ne*>
http://www.mikey.net/scuba
Pn(x) = (1/(2^n)n!)[d/dx]^n(x^2 - 1)^n

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