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To: techdiver@opal.com
Subject: PFO and Doppler
From: shelps@ac*.ma*.ad*.ed*.au* (Prime Rat)
Date: Tue, 6 Sep 1994 15:10:54 +0930
>>>I'd also like to know how a PFO causes a problem on the aterial side when
>>>the normally fluid dynamics would seem to make this a remote possibility.
>>>Can you educate all of us?

Because bubbles on any side of the circulation can activate complement and
initiate the coagulopathy which is part of the whole syndrome of
decompression illness

>>I do not think that two sets of tables are called for.  How are you going

I do not think that two sets of tables are called for either.  People dive
for years without an episode of DCI, then one day they get a 'hit'.  Which
set of (comercially available) tables should you use anyway?

>>to find out if you have a PFO?  Will the knowledge make any difference to
>>your diving?  The test is expensive and must be performed by an expert who
>>has carried out these tests many times and knows what to look for.  Even
>>cardiology consultants may not be able to do this.

>I thought that a good doppler study of the heart should pick up a PFO?  Not
>that expensive if extra precautions are in order for someone who has the
>defect.

Contrast echocardiography to detect a PFO is done with saline which has been
shaken.  Shaking introduces very small bubbles which are detected by the
ultrasonic Doppler.  That is to say, bubbles are injected into your circulation.

/Rat

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
shelps@ac*.ma*.ad*.ed*.au*|Stephen Helps PhD            Ack!  ___/|
FAX   (08)232-3283             |Anaesthesia & Intensive Care       \O.o|
Voice (08)224-5495             |University of Adelaide            =(___)=
                               |ADELAIDE, 5005, South Australia      U
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Dumas  : Hey, who used the cardiac output computer last, it's busted!
Yi Fei : Uuoohh. I dropped it the other day.  But I did not break it...
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

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