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To pick up on an old thread I have been pondering-

Specifically, in a typical wreck dive, carrying slightly hypoxic bottom
mix (ie. in the 16% range), is there a way to predict, if you use your
bottom mix for air breaks, what the optimal length of the air break
should be?
Is the length of time on back gas based on how long it takes for the
vasoconstriction induced by the pure O2 to clear?
If so, is there a way of predicting how long that takes based on the
ppO2 or %O2?
Or is it just empiric based on personal experience with different mixes?

Thanks
Wendell G

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