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>
>Liz wrote:
>
>> ...  since approx 25% of population
>> has PFO there are divers with PFO who are
>> asymptomatic.  But those with PFO are at
>> greater risk of DCS, embolic events and
>> hypoxia.
>

>Why hypoxia?

Hypoxia because some ofthe blood shunts back to the systemic
circulation instead of going to the pulmonary system to
be reoxygenated.

>
>> The researchers don't feel it
>> is necessary to screen all divers before
>> certification.  Those with known PFO
>> are advised to dive carefully (read, short
>> and shallow) if they should dive at all.
>
>A series of tests were run in Scotland about a year ago (I think) where
>volunteers submitted themselves for PFO testing. One of those found to
>have a PFO was a diver. He was immediately banned from diving by SSAC.
>He appealed on the basis that he had been diving for many years without
>incident and the fact that his PFO was so small that they had only just
>been able to detect it. In fact, they couldn't actually be sure it was
>a PFO. I'm not sure about the current state of his appeal.
>
>Alan
>
Exactly the point I was making in the post.  So many divers have
the problem, now what is to be done since many don't know thye
have PFO.

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