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>On Fri, 9 Dec 1994, J Shepherd wrote: > >> What Iain said, plus; >> >> Recompression treatment isn't just squeezing. The diagnosis and >> correct schedule are important. > >Diagnosis, yes. "correct" schedule....well...I don't think there's any >magical correctness to typical chamber schedules, other than the fact >that they've been used a lot. We're talking MAJOR inexact science here. >Besides, there are published "correct" schedules for IWR. > I have to agree with Richard. There is little or no scientific evidence that the chamber schedules used as a first line treatment for DCI, typically USN6/RN62, are the optimum treatment protocol. There use is historic, and based on a reasonable low risk of O2 convulsion at 18 metres. The reduction in bubble radius is not huge at 18 metres (you can all do the math) and the effect of the press on bubble growth will be relative to the gas tensions in the tissue where the bubble exists, and while beneficial, is an indeterminant value. It is likely that the 'dose' of O2 is more important than the press itsel, and I am not aware of any evidence that suggests 2.8 bar is the optimum O2 'dose'. On the other hand, recompression itself may be more important if it occurs immediately after the first decompression, as in missed stop variations or immediate IWR. regards, David Doolette ddoolett@me*.ad*.ed*.au*
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