Thanks all for the quick responses. I also found two research articles on DCS and PFO. Bottom line: 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. 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. Thanks Again, Liz
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