Mailing List Archive Mailing List Archive
Hello all I would suggest that you get your buddy to contact the people at the hyperbaric unit in Aberdeen. At Aberdeen royal infirmary. As a dive boat skipper in scapa I have witnessed several incidents and in recent years most of these have been later confirmed as pfo. Im sure that the guys in Aberdeen will have some stats.In message <9604291437.AA 18562@nw*.an*.co*>, oliver kierse <Olly.Kierse@an*.co*> writes > >Hi all, > >I'm posting this for a buddy who got hit, and does not have net access. > >I have a buddy who got bent last year but, because of no reason to suspect a >hit and an existing soft tissue injury to the affected shoulder, didn't realize >it until weeks after the fact. The incident hasn't been positively identified >as it occurred during a month of active deep diving. Believed probably >occurred after the second of two 42metre dives. First for 12 minutes, 4 deco, >second 4 hours later. Diving modified Buhlmann. Second dive of the day again >to 42metres. Surfaced in Table E after six minutes deco. Blazing hot Summer >day, peeled off dry-suit and went for a swim. (vigorous exercise?) Coming back >to port 30 minutes later itch across shoulders, checked immediately by buddy >-no blotches. Checked again 30 minutes later by buddy and again by diving >officer, all clear. >Sore shoulder nagged for a further two weeks before being diagnosed as a bend, >one two hour period of slight numbness/tingling in left leg provided the >prompt for medical evaluation. Chamber treatment for 2.5 hours on O2 resolved >symptoms. > >What caused it? The swimming after the dive or a PFO. Very few >manuals/books/instructors think to warn about avoiding excercise after diving, >especially deeper stuff but they should. To try narrow things down, he went >for the test and finds a big PFO. But the PFO was always there and never >caused problems in the previous 100 dives. So now what to do? The easy and >only guaranteed safe decision is to quit but there have to be a lot of people >who have experience of this and can answer some questions. > >Who rejects confirmed PFOs? >Why? >Reconcile this with medical proof of 30% PFO incidence in normal population? >With 30% of the pop affected, why aren't divers tested and 30% rejected? > >The heart pumps both sides simultaneously and as the freshly oxygenated supply >is to the whole body, the pressure will be higher on that side than the other, >hence the cross-flow will be just to recirculate. The 'victim' saw this >clearly on the enhanced U/S Doppler image. PFO under normal situations >cross-flows from the newly oxygenated lungs back into the CO2 and N2 rich feed >to the lungs so no increased risk there. > >Experiments to reverse PFO cross-flow are very difficult to effect and are >transitory. One theories relating to divers is: Valsalva-ing can change the >pressure differential from side-side momentarily changing the cross-flow. This >is only going to present a potential risk when outgassing, ie >ascending+decompressing and again is transitory. > >So why can anyone justify how PFOs increase risk and are reason to disqualify >and if so why aren't 100% of trainees tested and 30% rejected? > >The cardiologist who did the test did not agree a PFO should cause DCS or be >grounds for rejecting a diver. He did know what divers are and the mechanism >of DCS and quoted an article in The Lancet, supporting this position. > >Anyone reading this been or know anyone else in this position: been bent with >no obvious reason, subsequently found to have a PFO? What about anyone who's >confirmed a PFO but continued diving? > >So thats it - he's in a sitaution where info is hard to find, and hopefully some >of you out there can offer useful advice, or better, personal experience. Email >to me directly, or the group if you wish. > >Thanks, > >Olly > > >-- >Send mail for the `techdiver' mailing list to `techdiver@terra.net'. >Send subscription/archive requests to `techdiver-request@terra.net'. -- john thornton
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]