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Phil, everyone in the dive industry has played this tune forever. Get serious. Obvious is obvious. What you are leaving out of this misreprestation is the fact that just having a PFO, which 30% of us do have, is only one third of the equation. You must have the PFO, you must have bubbles, and you must open the PFO to get the resulting DCS. The othe rthing yu are blatently leaving out of this carp is the type of DCS - TYPE 2 - CNS as in Central NEervous Systeem, as in CAGE , as in "paradoxical" AGE, as in brain damaged, spine damaged, wheelchair parlayzed bent. Why is that so freaking hard for all of you to grasp? I personlly would not take that bet since all dives can generate bubbles, and in fact a real shower of bubbles is likely the best way to raise the right over left side pressure enough to open the PFO. Why is denial of reality so popular ? Why is it that so may people feel that this is a worthwhile bet to take, when the cost of finding out is less than a wrist dive computer ( a worthless trinket), a "tec" diving class , a deep air class, a regulator, or a half of a cheap druisuit?????????? Give me a break. Phil Davies wrote: > > I thought I'd post the following information regarding PFO and > decompressions sickness as I came across it the other day coincidently with > the developing thread in this list. I don't pretend to support it as > gospel truth but it is worth considering when talking about PFO and > prediposing factors for decompression sickness. > One study indicate that the presence of a patent foramen oval (PFO) does > not necesarily predispose a diver to decompression sickness. In a study of > 87 divers (Cross et al., 1992*) who had not had any form of decompression > sickness (NB this study was conducted in 1992 and may not have recognised > more current forms of decompression sickness eg. extreme fatigue), 24 > divers were found to have a PFO (~31%). A PFO is found in about 27% of the > population. It was especially noted that one subject (a professional > diver) had a large right to left shunt and have never experienced > decompression sickness. He had been diving for 30 yrs including some time > with the Royal navy and had conducted 637 dives with compressed air to a > max. depth of 60m, 141 closed circuit oxygen dives, 327 with N2/O2, 14 > surface oriented dives to 100m with He/O2 and 47 bell dives to 180m with > He/O2. > All the divers used convential deco tables or computers. Some even admitted > to having preformed dives with factors they suggested may have increased > their risk of developing decompression sickness. > While this is only one study and having only examined divers without a > history of decompression sickness does limit its views, at least it does > indicate that the presence of a PFO may not be a direct predisposing > factor to decompression sickness. > > *Cross, S.J. Evans,S.A, Thomson, L.F., Lee, H.S., Jennings, K.P. & Shields, > T.G. (1992) Safety of subaqua diving with patent foramen ovale. British > Medical journal 304: 481-482 > > Phil Davies > > -- > 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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