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Date: Tue, 23 Jul 1996 14:03:27 -0700
From: Peter Heseltine <heseltin@hs*.us*.ed*>
Organization: University of Southern California
To: gmiiii@in*.co*
CC: techdiver@terra.net
Subject: Checking for PFO - addendum

After I wrote this the obvious struck me: Maybe the water pressure on 
your chest (which usually raises right sided pressures) keeps 
almost *everybody's* foramen ovale open while they dive! Here's a task 
for you George, while you are locked in your habitat deco-ing for hours. 
Take down a doppler and see if you can pick up R to L blood flow on your 
buddies. These things actually work just like a video camera, so you 
could have the unit on the surface with an umbilical. All you need is the 
jelly to spread on your buddies chests. Hmm.

-ph
Peter Heseltine wrote on 7/22/96:
	 
Maybe the extra pressure on
your chest from the water keeps the PFO closed 99.999% of the time, even
in people who have one.

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