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Could you please describe the test that is used to detect PFO. I understand that this is important and I thank you for pointing it out. I would like to know what is involved so I can find a reliable physician to do the test. This is not something that is part of an annual physical. Ron ----- Original Message ----- From: "Trey" <trey@ne*.co*> To: "Jonas Bergenudd" <jonas@be*.ne*> Cc: "Quest@Gu*. Com" <quest@gu*.co*>; "Techdiver@Aquanaut.Com" <techdiver@aquanaut.com> Sent: Wednesday, June 06, 2001 3:27 AM Subject: PFO mechanics was RE: MINIMUM DECOMPRESSION > > English is an imprecise language - you have to know the context of > everything for it to make sense. However, the analogy of a railroad switch > is perfect. Before we are born, there is a flap between the right atria and > the left atria of the heart. Since we are not breathing, our lungs are full > of fluid, and we get our oxygen from the placenta interface - no need to > breath, no need for the heart to send blood through the lungs and back, so > it "shunts" the blood across between the two atria. The normal path is for > venous blood to enter the right heart , be pumped through the lungs, and > then back to the left heart where it is pushed into the arterial side. > > So you see that 100% of us have this flap. In 70% of us this flap grows back > to the left atrial wall. In 30% of us there is some unattached part, but the > flap generally stays shut since there is no pressure differential to open > it. If it does open, it allows blood from the right side to pass to the left > side without going through the lungs. If it were wide open, the person would > always be short of breath due to lack of enough oxygenated blood making it > into the arterial side. In a diver, this means that blood containing bubbles > from the venous side does not get filtered by the lungs and the bubbles get > shot straight to the arterial side, and the body parts supplied first are > the brain, spine and heart - not good places for bubbles. > > Things like coughing or urinating can change the pressure differential , and > the manipulations to the body by the doctors doing PFO tests are an effort > to simulate this, but the big factor is this: if you generate enough bubbles > they will inhibit the passage of blood through the lungs and raise the > pressure between the right heart and the lungs, causing a differential that > can then push open the flap and let blood "shunt" over to the left atria. > > This is important information and needs to be made available to all, not > hidden, twisted, or obscured by DAN or other dive industry shills. > > -----Original Message----- > From: Jonas Bergenudd [mailto:jonas@be*.ne*] > Sent: Wednesday, June 06, 2001 5:47 AM > To: Trey > Subject: RE: MINIMUM DECOMPRESSION > > > Hi George > > OK, it's a medical term. > > I thought it was some slang for something. Like stroke. > > I have a pretty good grasp of english but when it comes to specialized > english my limtations show. English is my second language. > > My dictionary said that a shunt is a railroadswitch. (didn't help much :o) > > regards > Jonas > > -- > Jonas Bergenudd > +46 733 909 909 > > > -----Original Message----- > > From: Trey [mailto:trey@ne*.co*] > > Sent: Monday, June 04, 2001 1:57 AM > > To: Jonas Bergenudd; Quest@Gu*. Com > > Subject: RE: MINIMUM DECOMPRESSION > > > > > > > > Sorry, should have been a "c" . Come on, cardiac and pulmonary shunts are > > not an American thing, they are a God thing. We all have them > > until we take > > our first breath, and then in 70% of us they heal up. In 30% they > > do not to > > some degree, and can be opened by a choke of bubbles in the lungs causing > > the right side heart pressure to rise above the left, allowing the Patent > > Foremen Ovale to open , letting unfiltered blood cross over to > > the arterial > > delivery side resulting in paradoxical gas embolism, usually CAGE and or > > spinal. > > > > -----Original Message----- > > From: Jonas Bergenudd [mailto:jonas@be*.ne*] > > Sent: Sunday, June 03, 2001 6:27 PM > > To: Quest@Gu*. Com > > Subject: RE: MINIMUM DECOMPRESSION > > > > > > > > > On gassing is easy - you do not blow gas into the tissues in > > bubble form > > > by on gassing. Off gassing is more tricky, as you want to prevent bubble > > > formation in the tissues at all depths, and in the blood deep. > > Off gassing > > > in bubble form into the blood is extremely efficient time wise > > and allows > > > faster decompressions that avoid building in one tissue while > > > eliminating in > > > another, but this is for non shunt people only. Unfortunately for the > > > shunts, the greatest incidence of bubbling into the venous blood occurs > > > after you get out of the water. > > > > From someone who doesn't come from the states - what's a shunt? > > > > /Jonas > > > > -- > > Jonas Bergenudd > > +46 733 909 909 > > > > > > > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: quest-unsubscribe@gu*.co* > > For additional commands, e-mail: quest-help@gu*.co* > > > > > > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. > -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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