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> Reply to: RE>>Gas with Air Repet > Roger Carlson wrote: > > >Speaking of bubbles wandering around in your bloodstream, I'm curious about > >the effect of a patent ovale foramen, a hole between one side of the heart and > >the other, allowing some amount of blood to get back into the body without > >going through the lungs. At first glance, it seems like a bad thing for > > A patent foramen ovale also creats another problem besides incomplete > blood transport (with soluable nitrogen) back to the lungs. The other > problem is that it forms a low pressure area in the heart (cavitation) > that could hasten nitrogen coming out of solution in the immediate area. > Not only could a bubble form in the heart (causing problems on ascent), > but could also lead to an air embolism along the lines of an Arterial > Gas Embolism (spontaneous gas forms in blood stream due to too rapid > of an ascent). > > And we thought diving was fun. > > Any comments on this, do I have it right? > > Steve Hogan > Steve_Hogan@qm*.sp*.tr*.co* > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@opal.com'. > Send subscription/archive requests to `techdiver-request@opal.com'. Don't forget that PFO comes in all shapes and sizes - some people will be worse affected than others. This goes some way to explaining the difference between different surveys of PFO incidence. Minimum 25% (= chronic observable condition) up to 33% (= acute observable condition, only observed when the heart or chest is under stress). I think ( :-) ). I didn't think that the original Buhlman had any correcting factor for microbubbles slowing down degassing. Clever bloke. Presumably (since this related to trimix) we ought to worry whether He and N2 bubbles behave differently...? Jason.
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