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Hi!
A few months ago there was a thread discussing ascent rates which turned into
a discussion on computerized decompression models.
Unfortunately I have lost the first letter but as far as I can remember
someone claimed that rapid compression could cause bone necrosis "due to the
high pressure gradients in the tissues" and the same person refered to a
chapter in Edmonds, Lowry, and Pennefather's "Diving and subaquatic
medicine".
I neither can understand how these pressure gradient can occur nor can I find
anything mentioned about it in my edition of "Diving and ...".
I am presently involved in a project studying the problems with deep single
escapes from disabled submarines. As a part of the project we do rapid
compressions to 50 m / 165feet followed by a normal decompression after 5 min
at pressure. In this case rapid is a doubling of pressure every 4 seconds
which results in a 50m compression taking about 10 seconds. The subjects
usually do only one or two dives each but we who assist the subjects we do
one dive a day for 7 or 8 days a little now and then...
The decompressions are usually not problematic but if the compression per se
can cause dybaric bone necrosis I am very very interested in learning more
about it.
{ke Larsson (E-mail Lars_Larsson@In*.se*)
National Defence Research Establishment Sweden
Naval medicine division
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